diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index ade416d..eba351b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -43,6 +43,6 @@ jobs:
       - run: opam exec -- dune runtest -p trace-tef,trace-fuchsia
 
       # with depopts
-      - run: opam install hmap
+      - run: opam install hmap mtime
       - run: opam exec -- dune build '@install' -p trace,trace-tef,trace-fuchsia
 
diff --git a/Makefile b/Makefile
index f575c6d..7c931c1 100644
--- a/Makefile
+++ b/Makefile
@@ -8,6 +8,8 @@ clean:
 
 test:
 	@dune runtest $(DUNE_OPTS)
+test-autopromote:
+	@dune runtest $(DUNE_OPTS) --auto-promote
 
 doc:
 	@dune build $(DUNE_OPTS) @doc
diff --git a/dune-project b/dune-project
index e55a503..102cf8e 100644
--- a/dune-project
+++ b/dune-project
@@ -1,26 +1,34 @@
 (lang dune 2.9)
 
 (name trace)
+
 (generate_opam_files true)
+
 (version 0.7)
 
 (source
  (github c-cube/ocaml-trace))
+
 (authors "Simon Cruanes")
+
 (maintainers "Simon Cruanes")
+
 (license MIT)
 
 ;(documentation https://url/to/documentation)
 
 (package
  (name trace)
- (synopsis "A stub for tracing/observability, agnostic in how data is collected")
+ (synopsis
+  "A stub for tracing/observability, agnostic in how data is collected")
  (depends
-   (ocaml (>= 4.08))
-   dune)
+  (ocaml
+   (>= 4.08))
+  dune)
  (depopts
-   hmap
-   (mtime (>= 2.0)))
+  hmap
+  (mtime
+   (>= 2.0)))
  (tags
   (trace tracing observability profiling)))
 
@@ -28,37 +36,54 @@
  (name ppx_trace)
  (synopsis "A ppx-based preprocessor for trace")
  (depends
-   (ocaml (>= 4.12)) ; we use __FUNCTION__
-   (ppxlib (>= 0.28))
-   (trace (= :version))
-   (trace-tef (and (= :version) :with-test))
-   dune)
+  (ocaml
+   (>= 4.12)) ; we use __FUNCTION__
+  (ppxlib
+   (>= 0.28))
+  (trace
+   (= :version))
+  (trace-tef
+   (and
+    (= :version)
+    :with-test))
+  dune)
+ (depopts
+   (mtime (>= 2.0)))
  (tags
   (trace ppx)))
 
 (package
  (name trace-tef)
- (synopsis "A simple backend for trace, emitting Catapult/TEF JSON into a file")
+ (synopsis
+  "A simple backend for trace, emitting Catapult/TEF JSON into a file")
  (depends
-   (ocaml (>= 4.08))
-   (trace (= :version))
-   (mtime (>= 2.0))
-   base-unix
-   dune)
+  (ocaml
+   (>= 4.08))
+  (trace
+   (= :version))
+  (mtime
+   (>= 2.0))
+  base-unix
+  dune)
  (tags
   (trace tracing catapult TEF chrome-format)))
 
 (package
  (name trace-fuchsia)
- (synopsis "A high-performance backend for trace, emitting a Fuchsia trace into a file")
+ (synopsis
+  "A high-performance backend for trace, emitting a Fuchsia trace into a file")
  (depends
-   (ocaml (>= 4.08))
-   (trace (= :version))
-   (mtime (>= 2.0))
-   (thread-local-storage (>= 0.2))
-   base-bigarray
-   base-unix
-   dune)
+  (ocaml
+   (>= 4.08))
+  (trace
+   (= :version))
+  (mtime
+   (>= 2.0))
+  (thread-local-storage
+   (>= 0.2))
+  base-bigarray
+  base-unix
+  dune)
  (tags
   (trace tracing fuchsia)))
 
diff --git a/ppx_trace.opam b/ppx_trace.opam
index e4f2ef7..5c83993 100644
--- a/ppx_trace.opam
+++ b/ppx_trace.opam
@@ -16,6 +16,9 @@ depends: [
   "dune" {>= "2.9"}
   "odoc" {with-doc}
 ]
+depopts: [
+  "mtime" {>= "2.0"}
+]
 build: [
   ["dune" "subst"] {dev}
   [
diff --git a/src/subscriber/callbacks.ml b/src/subscriber/callbacks.ml
new file mode 100644
index 0000000..3ff7647
--- /dev/null
+++ b/src/subscriber/callbacks.ml
@@ -0,0 +1,129 @@
+open Trace_core
+open Types
+
+(** First class module signature for callbacks *)
+module type S = sig
+  type st
+  (** Type of the state passed to every callback. *)
+
+  val on_init : st -> time_ns:float -> unit
+  (** Called when the subscriber is initialized in a collector *)
+
+  val on_shutdown : st -> time_ns:float -> unit
+  (** Called when the collector is shutdown *)
+
+  val on_name_thread : st -> time_ns:float -> tid:int -> name:string -> unit
+  (** Current thread is being named *)
+
+  val on_name_process : st -> time_ns:float -> tid:int -> name:string -> unit
+  (** Current process is being named *)
+
+  val on_enter_span :
+    st ->
+    __FUNCTION__:string option ->
+    __FILE__:string ->
+    __LINE__:int ->
+    time_ns:float ->
+    tid:int ->
+    data:(string * user_data) list ->
+    name:string ->
+    span ->
+    unit
+  (** Enter a regular (sync) span *)
+
+  val on_exit_span : st -> time_ns:float -> tid:int -> span -> unit
+  (** Exit a span. This and [on_enter_span] must follow strict stack discipline *)
+
+  val on_add_data : st -> data:(string * user_data) list -> span -> unit
+  (** Add data to a regular span (which must be active) *)
+
+  val on_message :
+    st ->
+    time_ns:float ->
+    tid:int ->
+    span:span option ->
+    data:(string * user_data) list ->
+    string ->
+    unit
+  (** Emit a log message *)
+
+  val on_counter :
+    st ->
+    time_ns:float ->
+    tid:int ->
+    data:(string * user_data) list ->
+    name:string ->
+    float ->
+    unit
+  (** Emit the current value of a counter *)
+
+  val on_enter_manual_span :
+    st ->
+    __FUNCTION__:string option ->
+    __FILE__:string ->
+    __LINE__:int ->
+    time_ns:float ->
+    tid:int ->
+    parent:span option ->
+    data:(string * user_data) list ->
+    name:string ->
+    flavor:flavor option ->
+    trace_id:int ->
+    span ->
+    unit
+  (** Enter a manual (possibly async) span *)
+
+  val on_exit_manual_span :
+    st ->
+    time_ns:float ->
+    tid:int ->
+    name:string ->
+    data:(string * user_data) list ->
+    flavor:flavor option ->
+    trace_id:int ->
+    span ->
+    unit
+  (** Exit a manual span *)
+end
+
+type 'st t = (module S with type st = 'st)
+(** Callbacks for a subscriber. There is one callback per event
+    in {!Trace}. The type ['st] is the state that is passed to
+    every single callback. *)
+
+(** Dummy callbacks.
+    It can be useful to reuse some of these functions in a
+    real subscriber that doesn't want to handle {b all}
+    events, but only some of them. *)
+module Dummy = struct
+  let on_init _ ~time_ns:_ = ()
+  let on_shutdown _ ~time_ns:_ = ()
+  let on_name_thread _ ~time_ns:_ ~tid:_ ~name:_ = ()
+  let on_name_process _ ~time_ns:_ ~tid:_ ~name:_ = ()
+  let on_message _ ~time_ns:_ ~tid:_ ~span:_ ~data:_ _msg = ()
+  let on_counter _ ~time_ns:_ ~tid:_ ~data:_ ~name:_ _v = ()
+
+  let on_enter_span _ ~__FUNCTION__:_ ~__FILE__:_ ~__LINE__:_ ~time_ns:_ ~tid:_
+      ~data:_ ~name:_ _sp =
+    ()
+
+  let on_exit_span _ ~time_ns:_ ~tid:_ _ = ()
+  let on_add_data _ ~data:_ _sp = ()
+
+  let on_enter_manual_span _ ~__FUNCTION__:_ ~__FILE__:_ ~__LINE__:_ ~time_ns:_
+      ~tid:_ ~parent:_ ~data:_ ~name:_ ~flavor:_ ~trace_id:_ _sp =
+    ()
+
+  let on_exit_manual_span _ ~time_ns:_ ~tid:_ ~name:_ ~data:_ ~flavor:_
+      ~trace_id:_ _ =
+    ()
+end
+
+(** Dummy callbacks, do nothing. *)
+let dummy (type st) () : st t =
+  let module M = struct
+    type nonrec st = st
+
+    include Dummy
+  end in
+  (module M)
diff --git a/src/subscriber/dune b/src/subscriber/dune
new file mode 100644
index 0000000..657c53f
--- /dev/null
+++ b/src/subscriber/dune
@@ -0,0 +1,13 @@
+
+(library
+  (name trace_subscriber)
+  (public_name trace.subscriber)
+  (libraries (re_export trace.core)
+             (select thread_.ml from
+                     (threads -> thread_.real.ml)
+                     ( -> thread_.dummy.ml))
+             (select time_.ml from
+                     (mtime mtime.clock.os -> time_.mtime.ml)
+                     (mtime mtime.clock.jsoo -> time_.mtime.ml)
+                     ( -> time_.dummy.ml))))
+
diff --git a/src/subscriber/subscriber.ml b/src/subscriber/subscriber.ml
new file mode 100644
index 0000000..0246984
--- /dev/null
+++ b/src/subscriber/subscriber.ml
@@ -0,0 +1,104 @@
+(** A trace subscriber. It pairs a set of callbacks
+    with the state they need (which can contain a file handle,
+    a socket, config, etc.).
+
+    The design goal for this is that it should be possible to avoid allocations
+    when the trace collector calls the callbacks. *)
+type t =
+  | Sub : {
+      st: 'st;
+      callbacks: 'st Callbacks.t;
+    }
+      -> t
+
+(** Dummy subscriber that ignores every call. *)
+let dummy : t = Sub { st = (); callbacks = Callbacks.dummy () }
+
+open struct
+  module Tee_cb : Callbacks.S with type st = t * t = struct
+    type nonrec st = t * t
+
+    let on_init
+        ( Sub { st = s1; callbacks = (module CB1) },
+          Sub { st = s2; callbacks = (module CB2) } ) ~time_ns =
+      CB1.on_init s1 ~time_ns;
+      CB2.on_init s2 ~time_ns
+
+    let on_shutdown
+        ( Sub { st = s1; callbacks = (module CB1) },
+          Sub { st = s2; callbacks = (module CB2) } ) ~time_ns =
+      CB1.on_shutdown s1 ~time_ns;
+      CB2.on_shutdown s2 ~time_ns
+
+    let on_name_thread
+        ( Sub { st = s1; callbacks = (module CB1) },
+          Sub { st = s2; callbacks = (module CB2) } ) ~time_ns ~tid ~name =
+      CB1.on_name_thread s1 ~time_ns ~tid ~name;
+      CB2.on_name_thread s2 ~time_ns ~tid ~name
+
+    let on_name_process
+        ( Sub { st = s1; callbacks = (module CB1) },
+          Sub { st = s2; callbacks = (module CB2) } ) ~time_ns ~tid ~name =
+      CB1.on_name_process s1 ~time_ns ~tid ~name;
+      CB2.on_name_process s2 ~time_ns ~tid ~name
+
+    let on_enter_span
+        ( Sub { st = s1; callbacks = (module CB1) },
+          Sub { st = s2; callbacks = (module CB2) } ) ~__FUNCTION__ ~__FILE__
+        ~__LINE__ ~time_ns ~tid ~data ~name span =
+      CB1.on_enter_span s1 ~__FUNCTION__ ~__FILE__ ~__LINE__ ~time_ns ~tid ~data
+        ~name span;
+      CB2.on_enter_span s2 ~__FUNCTION__ ~__FILE__ ~__LINE__ ~time_ns ~tid ~data
+        ~name span
+
+    let on_exit_span
+        ( Sub { st = s1; callbacks = (module CB1) },
+          Sub { st = s2; callbacks = (module CB2) } ) ~time_ns ~tid span =
+      CB1.on_exit_span s1 ~time_ns ~tid span;
+      CB2.on_exit_span s2 ~time_ns ~tid span
+
+    let on_add_data
+        ( Sub { st = s1; callbacks = (module CB1) },
+          Sub { st = s2; callbacks = (module CB2) } ) ~data span =
+      CB1.on_add_data s1 ~data span;
+      CB2.on_add_data s2 ~data span
+
+    let on_message
+        ( Sub { st = s1; callbacks = (module CB1) },
+          Sub { st = s2; callbacks = (module CB2) } ) ~time_ns ~tid ~span ~data
+        msg =
+      CB1.on_message s1 ~time_ns ~tid ~span ~data msg;
+      CB2.on_message s2 ~time_ns ~tid ~span ~data msg
+
+    let on_counter
+        ( Sub { st = s1; callbacks = (module CB1) },
+          Sub { st = s2; callbacks = (module CB2) } ) ~time_ns ~tid ~data ~name
+        n =
+      CB1.on_counter s1 ~time_ns ~tid ~data ~name n;
+      CB2.on_counter s2 ~time_ns ~tid ~data ~name n
+
+    let on_enter_manual_span
+        ( Sub { st = s1; callbacks = (module CB1) },
+          Sub { st = s2; callbacks = (module CB2) } ) ~__FUNCTION__ ~__FILE__
+        ~__LINE__ ~time_ns ~tid ~parent ~data ~name ~flavor ~trace_id span =
+      CB1.on_enter_manual_span s1 ~__FUNCTION__ ~__FILE__ ~__LINE__ ~time_ns
+        ~tid ~parent ~data ~name ~flavor ~trace_id span;
+      CB2.on_enter_manual_span s2 ~__FUNCTION__ ~__FILE__ ~__LINE__ ~time_ns
+        ~tid ~parent ~data ~name ~flavor ~trace_id span
+
+    let on_exit_manual_span
+        ( Sub { st = s1; callbacks = (module CB1) },
+          Sub { st = s2; callbacks = (module CB2) } ) ~time_ns ~tid ~name ~data
+        ~flavor ~trace_id span =
+      CB1.on_exit_manual_span s1 ~time_ns ~tid ~name ~data ~flavor ~trace_id
+        span;
+      CB2.on_exit_manual_span s2 ~time_ns ~tid ~name ~data ~flavor ~trace_id
+        span
+  end
+end
+
+(** [tee s1 s2] is a subscriber that forwards every
+    call to [s1] and [s2] both. *)
+let tee (s1 : t) (s2 : t) : t =
+  let st = s1, s2 in
+  Sub { st; callbacks = (module Tee_cb) }
diff --git a/src/subscriber/thread_.dummy.ml b/src/subscriber/thread_.dummy.ml
new file mode 100644
index 0000000..29ea74d
--- /dev/null
+++ b/src/subscriber/thread_.dummy.ml
@@ -0,0 +1 @@
+let[@inline] get_tid () = 0
diff --git a/src/subscriber/thread_.mli b/src/subscriber/thread_.mli
new file mode 100644
index 0000000..08e8ea1
--- /dev/null
+++ b/src/subscriber/thread_.mli
@@ -0,0 +1,2 @@
+val get_tid : unit -> int
+(** Get current thread ID *)
diff --git a/src/subscriber/thread_.real.ml b/src/subscriber/thread_.real.ml
new file mode 100644
index 0000000..51a172c
--- /dev/null
+++ b/src/subscriber/thread_.real.ml
@@ -0,0 +1 @@
+let[@inline] get_tid () = Thread.id @@ Thread.self ()
diff --git a/src/subscriber/time_.dummy.ml b/src/subscriber/time_.dummy.ml
new file mode 100644
index 0000000..c727752
--- /dev/null
+++ b/src/subscriber/time_.dummy.ml
@@ -0,0 +1 @@
+let[@inline] get_time_ns () : float = 0.
diff --git a/src/subscriber/time_.mli b/src/subscriber/time_.mli
new file mode 100644
index 0000000..ee1a9f4
--- /dev/null
+++ b/src/subscriber/time_.mli
@@ -0,0 +1 @@
+val get_time_ns : unit -> float
diff --git a/src/subscriber/time_.mtime.ml b/src/subscriber/time_.mtime.ml
new file mode 100644
index 0000000..89c80d1
--- /dev/null
+++ b/src/subscriber/time_.mtime.ml
@@ -0,0 +1,3 @@
+let get_time_ns () : float =
+  let t = Mtime_clock.now () in
+  Int64.to_float (Mtime.to_uint64_ns t)
diff --git a/src/subscriber/trace_subscriber.ml b/src/subscriber/trace_subscriber.ml
new file mode 100644
index 0000000..bbe4626
--- /dev/null
+++ b/src/subscriber/trace_subscriber.ml
@@ -0,0 +1,187 @@
+open Trace_core
+module Callbacks = Callbacks
+module Subscriber = Subscriber
+include Types
+
+type t = Subscriber.t
+
+module Private_ = struct
+  let get_now_ns_ = ref None
+  let get_tid_ = ref None
+
+  (** Now, in nanoseconds *)
+  let[@inline] now_ns () : float =
+    match !get_now_ns_ with
+    | Some f -> f ()
+    | None ->
+      let t = Mtime_clock.now () in
+      Int64.to_float (Mtime.to_uint64_ns t)
+
+  let[@inline] tid_ () : int =
+    match !get_tid_ with
+    | Some f -> f ()
+    | None -> Thread_.get_tid ()
+end
+
+open struct
+  module A = Trace_core.Internal_.Atomic_
+
+  type manual_span_info = {
+    name: string;
+    flavor: flavor option;
+    mutable data: (string * user_data) list;
+  }
+
+  (** Key used to carry some information between begin and end of
+    manual spans, by way of the meta map *)
+  let key_manual_info : manual_span_info Meta_map.key = Meta_map.Key.create ()
+
+  (** key used to carry a unique "id" for all spans in an async context *)
+  let key_async_trace_id : int Meta_map.key = Meta_map.Key.create ()
+end
+
+let[@inline] conv_flavor = function
+  | `Async -> Async
+  | `Sync -> Sync
+
+let[@inline] conv_flavor_opt = function
+  | None -> None
+  | Some f -> Some (conv_flavor f)
+
+let[@inline] conv_user_data = function
+  | `Int i -> U_int i
+  | `Bool b -> U_bool b
+  | `Float f -> U_float f
+  | `String s -> U_string s
+  | `None -> U_none
+
+let rec conv_data = function
+  | [] -> []
+  | [ (k, v) ] -> [ k, conv_user_data v ]
+  | (k, v) :: tl -> (k, conv_user_data v) :: conv_data tl
+
+(** A collector that calls the callbacks of subscriber *)
+let collector (Sub { st; callbacks = (module CB) } : Subscriber.t) : collector =
+  let open Private_ in
+  let module M = struct
+    let trace_id_gen_ = A.make 0
+
+    (** generator for span ids *)
+    let new_span_ : unit -> int =
+      let span_id_gen_ = A.make 0 in
+      fun [@inline] () -> A.fetch_and_add span_id_gen_ 1
+
+    let enter_span ~__FUNCTION__ ~__FILE__ ~__LINE__ ~data name : span =
+      let span = Int64.of_int (new_span_ ()) in
+      let tid = tid_ () in
+      let time_ns = now_ns () in
+      let data = conv_data data in
+      CB.on_enter_span st ~__FUNCTION__ ~__FILE__ ~__LINE__ ~time_ns ~tid ~data
+        ~name span;
+      span
+
+    let exit_span span : unit =
+      let time_ns = now_ns () in
+      let tid = tid_ () in
+      CB.on_exit_span st ~time_ns ~tid span
+
+    let with_span ~__FUNCTION__ ~__FILE__ ~__LINE__ ~data name f =
+      let span = enter_span ~__FUNCTION__ ~__FILE__ ~__LINE__ ~data name in
+      try
+        let x = f span in
+        exit_span span;
+        x
+      with exn ->
+        let bt = Printexc.get_raw_backtrace () in
+        exit_span span;
+        Printexc.raise_with_backtrace exn bt
+
+    let add_data_to_span span data =
+      if data <> [] then (
+        let data = conv_data data in
+        CB.on_add_data st ~data span
+      )
+
+    let enter_manual_span ~(parent : explicit_span option) ~flavor ~__FUNCTION__
+        ~__FILE__ ~__LINE__ ~data name : explicit_span =
+      let span = Int64.of_int (new_span_ ()) in
+      let tid = tid_ () in
+      let time_ns = now_ns () in
+      let data = conv_data data in
+      let flavor = conv_flavor_opt flavor in
+
+      (* get the common trace id, or make a new one *)
+      let trace_id, parent =
+        match parent with
+        | Some m -> Meta_map.find_exn key_async_trace_id m.meta, Some m.span
+        | None -> A.fetch_and_add trace_id_gen_ 1, None
+      in
+
+      CB.on_enter_manual_span st ~__FUNCTION__ ~__FILE__ ~__LINE__ ~parent ~data
+        ~time_ns ~tid ~name ~flavor ~trace_id span;
+      let meta =
+        Meta_map.empty
+        |> Meta_map.add key_manual_info { name; flavor; data = [] }
+        |> Meta_map.add key_async_trace_id trace_id
+      in
+      { span; meta }
+
+    let exit_manual_span (es : explicit_span) : unit =
+      let time_ns = now_ns () in
+      let tid = tid_ () in
+      let trace_id =
+        match Meta_map.find key_async_trace_id es.meta with
+        | None -> assert false
+        | Some id -> id
+      in
+      let minfo =
+        match Meta_map.find key_manual_info es.meta with
+        | None -> assert false
+        | Some m -> m
+      in
+      CB.on_exit_manual_span st ~tid ~time_ns ~data:minfo.data ~name:minfo.name
+        ~flavor:minfo.flavor ~trace_id es.span
+
+    let add_data_to_manual_span (es : explicit_span) data =
+      if data <> [] then (
+        let data = conv_data data in
+        match Meta_map.find key_manual_info es.meta with
+        | None -> assert false
+        | Some m -> m.data <- List.rev_append data m.data
+      )
+
+    let message ?span ~data msg : unit =
+      let time_ns = now_ns () in
+      let tid = tid_ () in
+      let data = conv_data data in
+      CB.on_message st ~time_ns ~tid ~span ~data msg
+
+    let counter_float ~data name f : unit =
+      let time_ns = now_ns () in
+      let tid = tid_ () in
+      let data = conv_data data in
+      CB.on_counter st ~tid ~time_ns ~data ~name f
+
+    let[@inline] counter_int ~data name i =
+      counter_float ~data name (float_of_int i)
+
+    let name_process name : unit =
+      let tid = tid_ () in
+      let time_ns = now_ns () in
+      CB.on_name_process st ~time_ns ~tid ~name
+
+    let name_thread name : unit =
+      let tid = tid_ () in
+      let time_ns = now_ns () in
+      CB.on_name_thread st ~time_ns ~tid ~name
+
+    let shutdown () =
+      let time_ns = now_ns () in
+      CB.on_shutdown st ~time_ns
+
+    let () =
+      (* init code *)
+      let time_ns = now_ns () in
+      CB.on_init st ~time_ns
+  end in
+  (module M)
diff --git a/src/subscriber/trace_subscriber.mli b/src/subscriber/trace_subscriber.mli
new file mode 100644
index 0000000..bba7982
--- /dev/null
+++ b/src/subscriber/trace_subscriber.mli
@@ -0,0 +1,33 @@
+(** Generic subscribers.
+
+    This defines the notion of a {b subscriber},
+    a set of callbacks for every trace event.
+    It also defines a collector that needs to be installed
+    for the subscriber(s) to be called.
+
+    @since NEXT_RELEASE
+*)
+
+module Callbacks = Callbacks
+module Subscriber = Subscriber
+
+include module type of struct
+  include Types
+end
+
+type t = Subscriber.t
+
+val collector : t -> Trace_core.collector
+
+(**/**)
+
+(**/*)
+module Private_ : sig
+  val get_now_ns_ : (unit -> float) option ref
+  (** The callback used to get the current timestamp *)
+
+  val get_tid_ : (unit -> int) option ref
+  (** The callback used to get the current thread's id *)
+
+  val now_ns : unit -> float
+end
diff --git a/src/subscriber/types.ml b/src/subscriber/types.ml
new file mode 100644
index 0000000..e507f46
--- /dev/null
+++ b/src/subscriber/types.ml
@@ -0,0 +1,10 @@
+type user_data =
+  | U_bool of bool
+  | U_float of float
+  | U_int of int
+  | U_none
+  | U_string of string
+
+type flavor =
+  | Sync
+  | Async
diff --git a/src/tef-tldrs/dune b/src/tef-tldrs/dune
index 9f99684..37fa81d 100644
--- a/src/tef-tldrs/dune
+++ b/src/tef-tldrs/dune
@@ -1,6 +1,11 @@
-
 (library
-  (name trace_tef_tldrs)
-  (public_name trace-tef.tldrs)
-  (synopsis "Multiprocess tracing using the `tldrs` daemon")
-  (libraries trace.core trace.private.util trace-tef unix threads))
+ (name trace_tef_tldrs)
+ (public_name trace-tef.tldrs)
+ (synopsis "Multiprocess tracing using the `tldrs` daemon")
+ (libraries
+  trace.core
+  trace.private.util
+  trace.subscriber
+  trace-tef
+  unix
+  threads))
diff --git a/src/tef-tldrs/trace_tef_tldrs.ml b/src/tef-tldrs/trace_tef_tldrs.ml
index ae09334..90b4e9f 100644
--- a/src/tef-tldrs/trace_tef_tldrs.ml
+++ b/src/tef-tldrs/trace_tef_tldrs.ml
@@ -84,7 +84,7 @@ let find_role ~out () : role =
       | Some path -> Some (write_to_file path)
       | None -> None))
 
-let collector_ (client : as_client) : collector =
+let subscriber_ (client : as_client) : Trace_subscriber.t =
   (* connect to unix socket *)
   let sock = Unix.socket Unix.PF_UNIX Unix.SOCK_STREAM 0 in
   (try Unix.connect sock (Unix.ADDR_UNIX client.socket)
@@ -105,24 +105,31 @@ let collector_ (client : as_client) : collector =
   in
 
   fpf out "OPEN %s\n%!" client.trace_id;
-  Trace_tef.Internal_.collector_jsonl ~finally ~out:(`Output out) ()
+  Trace_tef.Private_.subscriber_jsonl ~finally ~out:(`Output out) ()
+
+let subscriber ~out () =
+  let role = find_role ~out () in
+  match role with
+  | None -> assert false
+  | Some c -> subscriber_ c
 
 let collector ~out () : collector =
   let role = find_role ~out () in
   match role with
   | None -> assert false
-  | Some c -> collector_ c
+  | Some c -> subscriber_ c |> Trace_subscriber.collector
 
 let setup ?(out = `Env) () =
   let role = find_role ~out () in
   match role with
   | None -> ()
-  | Some c -> Trace_core.setup_collector @@ collector_ c
+  | Some c ->
+    Trace_core.setup_collector @@ Trace_subscriber.collector @@ subscriber_ c
 
 let with_setup ?out () f =
   setup ?out ();
   Fun.protect ~finally:Trace_core.shutdown f
 
-module Internal_ = struct
-  include Trace_tef.Internal_
+module Private_ = struct
+  include Trace_tef.Private_
 end
diff --git a/src/tef-tldrs/trace_tef_tldrs.mli b/src/tef-tldrs/trace_tef_tldrs.mli
index dc67648..e9e8132 100644
--- a/src/tef-tldrs/trace_tef_tldrs.mli
+++ b/src/tef-tldrs/trace_tef_tldrs.mli
@@ -1,7 +1,13 @@
+(** Emit traces by talking to the {{: https://github.com/imandra-ai/tldrs} tldrs} daemon *)
+
 val collector : out:[ `File of string ] -> unit -> Trace_core.collector
 (** Make a collector that writes into the given output.
     See {!setup} for more details. *)
 
+val subscriber : out:[ `File of string ] -> unit -> Trace_subscriber.t
+(** Make a subscriber that writes into the given output.
+    @since NEXT_RELEASE *)
+
 type output = [ `File of string ]
 (** Output for tracing.
     - [`File "foo"] will enable tracing and print events into file
@@ -30,7 +36,7 @@ val with_setup : ?out:[ output | `Env ] -> unit -> (unit -> 'a) -> 'a
 
 (**/**)
 
-module Internal_ : sig
+module Private_ : sig
   val mock_all_ : unit -> unit
   (** use fake, deterministic timestamps, TID, PID *)
 
diff --git a/src/tef/dune b/src/tef/dune
index 156eec1..2e036f9 100644
--- a/src/tef/dune
+++ b/src/tef/dune
@@ -1,6 +1,13 @@
-
 (library
-  (name trace_tef)
-  (public_name trace-tef)
-  (synopsis "Simple and lightweight tracing using TEF/Catapult format, in-process")
-  (libraries trace.core trace.private.util mtime mtime.clock.os unix threads))
+ (name trace_tef)
+ (public_name trace-tef)
+ (synopsis
+  "Simple and lightweight tracing using TEF/Catapult format, in-process")
+ (libraries
+  trace.core
+  trace.private.util
+  trace.subscriber
+  mtime
+  mtime.clock.os
+  unix
+  threads))
diff --git a/src/tef/event.ml b/src/tef/event.ml
index 17d8fff..fee8acc 100644
--- a/src/tef/event.ml
+++ b/src/tef/event.ml
@@ -1,12 +1,14 @@
 open Trace_core
+module Sub = Trace_subscriber
 
+(** An event, specialized for TEF *)
 type t =
   | E_tick
   | E_message of {
       tid: int;
       msg: string;
       time_us: float;
-      data: (string * user_data) list;
+      data: (string * Sub.user_data) list;
     }
   | E_define_span of {
       tid: int;
@@ -14,7 +16,7 @@ type t =
       time_us: float;
       id: span;
       fun_name: string option;
-      data: (string * user_data) list;
+      data: (string * Sub.user_data) list;
     }
   | E_exit_span of {
       id: span;
@@ -22,23 +24,23 @@ type t =
     }
   | E_add_data of {
       id: span;
-      data: (string * user_data) list;
+      data: (string * Sub.user_data) list;
     }
   | E_enter_manual_span of {
       tid: int;
       name: string;
       time_us: float;
       id: int;
-      flavor: [ `Sync | `Async ] option;
+      flavor: Sub.flavor option;
       fun_name: string option;
-      data: (string * user_data) list;
+      data: (string * Sub.user_data) list;
     }
   | E_exit_manual_span of {
       tid: int;
       name: string;
       time_us: float;
-      flavor: [ `Sync | `Async ] option;
-      data: (string * user_data) list;
+      flavor: Sub.flavor option;
+      data: (string * Sub.user_data) list;
       id: int;
     }
   | E_counter of {
diff --git a/src/tef/trace_tef.ml b/src/tef/trace_tef.ml
index 7fea2ae..7002cbf 100644
--- a/src/tef/trace_tef.ml
+++ b/src/tef/trace_tef.ml
@@ -1,30 +1,23 @@
 open Trace_core
 open Trace_private_util
 open Event
+module Sub = Trace_subscriber
 module A = Trace_core.Internal_.Atomic_
 
-let ( let@ ) = ( @@ )
+let on_tracing_error = ref (fun s -> Printf.eprintf "trace-tef error: %s\n%!" s)
 
 module Mock_ = struct
   let enabled = ref false
   let now = ref 0
 
-  let[@inline never] now_us () : float =
+  (* used to mock timing *)
+  let get_now_ns () : float =
     let x = !now in
     incr now;
-    float_of_int x
-end
+    float_of_int x *. 1000.
 
-(** Now, in microseconds *)
-let[@inline] now_us () : float =
-  if !Mock_.enabled then
-    Mock_.now_us ()
-  else (
-    let t = Mtime_clock.now () in
-    Int64.to_float (Mtime.to_uint64_ns t) /. 1e3
-  )
-
-let on_tracing_error = ref (fun s -> Printf.eprintf "trace-tef error: %s\n%!" s)
+  let get_tid_ () : int = 3
+end
 
 module Span_tbl = Hashtbl.Make (struct
   include Int64
@@ -36,18 +29,9 @@ type span_info = {
   tid: int;
   name: string;
   start_us: float;
-  mutable data: (string * user_data) list;
+  mutable data: (string * Sub.user_data) list;
 }
 
-(** key used to carry a unique "id" for all spans in an async context *)
-let key_async_id : int Meta_map.key = Meta_map.Key.create ()
-
-let key_async_data : (string * [ `Sync | `Async ] option) Meta_map.key =
-  Meta_map.Key.create ()
-
-let key_data : (string * user_data) list ref Meta_map.key =
-  Meta_map.Key.create ()
-
 (** Writer: knows how to write entries to a file in TEF format *)
 module Writer = struct
   type t = {
@@ -126,12 +110,12 @@ module Writer = struct
     String.iter encode_char s;
     char buf '"'
 
-  let pp_user_data_ (out : Buffer.t) : [< user_data ] -> unit = function
-    | `None -> raw_string out "null"
-    | `Int i -> Printf.bprintf out "%d" i
-    | `Bool b -> Printf.bprintf out "%b" b
-    | `String s -> str_val out s
-    | `Float f -> Printf.bprintf out "%g" f
+  let pp_user_data_ (out : Buffer.t) : Sub.user_data -> unit = function
+    | U_none -> raw_string out "null"
+    | U_int i -> Printf.bprintf out "%d" i
+    | U_bool b -> Printf.bprintf out "%b" b
+    | U_string s -> str_val out s
+    | U_float f -> Printf.bprintf out "%g" f
 
   (* emit args, if not empty. [ppv] is used to print values. *)
   let emit_args_o_ ppv (out : Buffer.t) args : unit =
@@ -158,26 +142,28 @@ module Writer = struct
       args;
     Buffer.output_buffer self.oc self.buf
 
-  let emit_manual_begin ~tid ~name ~id ~ts ~args ~flavor (self : t) : unit =
+  let emit_manual_begin ~tid ~name ~id ~ts ~args ~(flavor : Sub.flavor option)
+      (self : t) : unit =
     emit_sep_and_start_ self;
     Printf.bprintf self.buf
       {json|{"pid":%d,"cat":"trace","id":%d,"tid": %d,"ts": %.2f,"name":%a,"ph":"%c"%a}|json}
       self.pid id tid ts str_val name
       (match flavor with
-      | None | Some `Async -> 'b'
-      | Some `Sync -> 'B')
+      | None | Some Async -> 'b'
+      | Some Sync -> 'B')
       (emit_args_o_ pp_user_data_)
       args;
     Buffer.output_buffer self.oc self.buf
 
-  let emit_manual_end ~tid ~name ~id ~ts ~flavor ~args (self : t) : unit =
+  let emit_manual_end ~tid ~name ~id ~ts ~(flavor : Sub.flavor option) ~args
+      (self : t) : unit =
     emit_sep_and_start_ self;
     Printf.bprintf self.buf
       {json|{"pid":%d,"cat":"trace","id":%d,"tid": %d,"ts": %.2f,"name":%a,"ph":"%c"%a}|json}
       self.pid id tid ts str_val name
       (match flavor with
-      | None | Some `Async -> 'e'
-      | Some `Sync -> 'E')
+      | None | Some Async -> 'e'
+      | Some Sync -> 'E')
       (emit_args_o_ pp_user_data_)
       args;
     Buffer.output_buffer self.oc self.buf
@@ -197,7 +183,7 @@ module Writer = struct
       {json|{"pid":%d,"tid": %d,"name":"thread_name","ph":"M"%a}|json} self.pid
       tid
       (emit_args_o_ pp_user_data_)
-      [ "name", `String name ];
+      [ "name", U_string name ];
     Buffer.output_buffer self.oc self.buf
 
   let emit_name_process ~name (self : t) : unit =
@@ -205,7 +191,7 @@ module Writer = struct
     Printf.bprintf self.buf
       {json|{"pid":%d,"name":"process_name","ph":"M"%a}|json} self.pid
       (emit_args_o_ pp_user_data_)
-      [ "name", `String name ];
+      [ "name", U_string name ];
     Buffer.output_buffer self.oc self.buf
 
   let emit_counter ~name ~tid ~ts (self : t) f : unit =
@@ -214,7 +200,7 @@ module Writer = struct
       {json|{"pid":%d,"tid":%d,"ts":%.2f,"name":"c","ph":"C"%a}|json} self.pid
       tid ts
       (emit_args_o_ pp_user_data_)
-      [ name, `Float f ];
+      [ name, U_float f ];
     Buffer.output_buffer self.oc self.buf
 end
 
@@ -231,7 +217,7 @@ let bg_thread ~mode ~out (events : Event.t B_queue.t) : unit =
   let add_fun_name_ fun_name data : _ list =
     match fun_name with
     | None -> data
-    | Some f -> ("function", `String f) :: data
+    | Some f -> ("function", Sub.U_string f) :: data
   in
 
   (* how to deal with an event *)
@@ -280,7 +266,8 @@ let bg_thread ~mode ~out (events : Event.t B_queue.t) : unit =
     (* write a message about us closing *)
     Writer.emit_instant_event ~name:"tef-worker.exit"
       ~tid:(Thread.id @@ Thread.self ())
-      ~ts:(now_us ()) ~args:[] writer;
+      ~ts:(Sub.Private_.now_ns () *. 1e-3)
+      ~args:[] writer;
 
     (* warn if app didn't close all spans *)
     if Span_tbl.length spans > 0 then
@@ -304,138 +291,90 @@ type output =
   | `File of string
   ]
 
-let collector_ ~(finally : unit -> unit) ~(mode : [ `Single | `Jsonl ]) ~out ()
-    : collector =
-  let module M = struct
-    let active = A.make true
-
-    (** generator for span ids *)
-    let span_id_gen_ = A.make 0
-
-    (* queue of messages to write *)
-    let events : Event.t B_queue.t = B_queue.create ()
-
-    (** writer thread. It receives events and writes them to [oc]. *)
-    let t_write : Thread.t =
-      Thread.create
-        (fun () ->
-          let@ () = Fun.protect ~finally in
-          bg_thread ~mode ~out events)
-        ()
-
-    (** ticker thread, regularly sends a message to the writer thread.
-         no need to join it. *)
-    let _t_tick : Thread.t = Thread.create (fun () -> tick_thread events) ()
-
-    let shutdown () =
-      if A.exchange active false then (
-        B_queue.close events;
+module Internal_st = struct
+  type t = {
+    active: bool A.t;
+    events: Event.t B_queue.t;
+    t_write: Thread.t;
+  }
+end
+
+let subscriber_ ~finally ~out ~(mode : [ `Single | `Jsonl ]) () : Sub.t =
+  let module M : Sub.Callbacks.S with type st = Internal_st.t = struct
+    type st = Internal_st.t
+
+    let on_init _ ~time_ns:_ = ()
+
+    let on_shutdown (self : st) ~time_ns:_ =
+      if A.exchange self.active false then (
+        B_queue.close self.events;
         (* wait for writer thread to be done. The writer thread will exit
            after processing remaining events because the queue is now closed *)
-        Thread.join t_write
+        Thread.join self.t_write
       )
 
-    let get_tid_ () : int =
-      if !Mock_.enabled then
-        3
-      else
-        Thread.id (Thread.self ())
-
-    let[@inline] enter_span_ ~fun_name ~data name : span =
-      let span = Int64.of_int (A.fetch_and_add span_id_gen_ 1) in
-      let tid = get_tid_ () in
-      let time_us = now_us () in
-      B_queue.push events
-        (E_define_span { tid; name; time_us; id = span; fun_name; data });
-      span
-
-    let enter_span ~__FUNCTION__:fun_name ~__FILE__:_ ~__LINE__:_ ~data name :
-        span =
-      enter_span_ ~fun_name ~data name
-
-    let exit_span span : unit =
-      let time_us = now_us () in
-      B_queue.push events (E_exit_span { id = span; time_us })
-
-    (* re-raise exception with its backtrace *)
-    external reraise : exn -> 'a = "%reraise"
-
-    let with_span ~__FUNCTION__:fun_name ~__FILE__:_ ~__LINE__:_ ~data name f =
-      let span = enter_span_ ~fun_name ~data name in
-      try
-        let x = f span in
-        exit_span span;
-        x
-      with exn ->
-        exit_span span;
-        reraise exn
-
-    let add_data_to_span span data =
-      if data <> [] then B_queue.push events (E_add_data { id = span; data })
-
-    let enter_manual_span ~(parent : explicit_span option) ~flavor
-        ~__FUNCTION__:fun_name ~__FILE__:_ ~__LINE__:_ ~data name :
-        explicit_span =
-      (* get the id, or make a new one *)
-      let id =
-        match parent with
-        | Some m -> Meta_map.find_exn key_async_id m.meta
-        | None -> A.fetch_and_add span_id_gen_ 1
-      in
-      let time_us = now_us () in
-      B_queue.push events
-        (E_enter_manual_span
-           { id; time_us; tid = get_tid_ (); data; name; fun_name; flavor });
-      {
-        span = 0L;
-        meta =
-          Meta_map.(
-            empty |> add key_async_id id |> add key_async_data (name, flavor));
-      }
-
-    let exit_manual_span (es : explicit_span) : unit =
-      let id = Meta_map.find_exn key_async_id es.meta in
-      let name, flavor = Meta_map.find_exn key_async_data es.meta in
-      let data =
-        match Meta_map.find key_data es.meta with
-        | None -> []
-        | Some r -> !r
-      in
-      let time_us = now_us () in
-      let tid = get_tid_ () in
-      B_queue.push events
-        (E_exit_manual_span { tid; id; name; time_us; data; flavor })
-
-    let add_data_to_manual_span (es : explicit_span) data =
-      if data <> [] then (
-        let data_ref, add =
-          match Meta_map.find key_data es.meta with
-          | Some r -> r, false
-          | None -> ref [], true
-        in
-        let new_data = List.rev_append data !data_ref in
-        data_ref := new_data;
-        if add then es.meta <- Meta_map.add key_data data_ref es.meta
-      )
-
-    let message ?span:_ ~data msg : unit =
-      let time_us = now_us () in
-      let tid = get_tid_ () in
-      B_queue.push events (E_message { tid; time_us; msg; data })
+    let on_name_process (self : st) ~time_ns:_ ~tid:_ ~name : unit =
+      B_queue.push self.events @@ E_name_process { name }
+
+    let on_name_thread (self : st) ~time_ns:_ ~tid ~name : unit =
+      B_queue.push self.events @@ E_name_thread { tid; name }
+
+    let[@inline] on_enter_span (self : st) ~__FUNCTION__:fun_name ~__FILE__:_
+        ~__LINE__:_ ~time_ns ~tid ~data ~name span : unit =
+      let time_us = time_ns *. 1e-3 in
+      B_queue.push self.events
+      @@ E_define_span { tid; name; time_us; id = span; fun_name; data }
+
+    let on_exit_span (self : st) ~time_ns ~tid:_ span : unit =
+      let time_us = time_ns *. 1e-3 in
+      B_queue.push self.events @@ E_exit_span { id = span; time_us }
+
+    let on_add_data (self : st) ~data span =
+      if data <> [] then
+        B_queue.push self.events @@ E_add_data { id = span; data }
+
+    let on_message (self : st) ~time_ns ~tid ~span:_ ~data msg : unit =
+      let time_us = time_ns *. 1e-3 in
+      B_queue.push self.events @@ E_message { tid; time_us; msg; data }
+
+    let on_counter (self : st) ~time_ns ~tid ~data:_ ~name f : unit =
+      let time_us = time_ns *. 1e-3 in
+      B_queue.push self.events @@ E_counter { name; n = f; time_us; tid }
+
+    let on_enter_manual_span (self : st) ~__FUNCTION__:fun_name ~__FILE__:_
+        ~__LINE__:_ ~time_ns ~tid ~parent:_ ~data ~name ~flavor ~trace_id _span
+        : unit =
+      let time_us = time_ns *. 1e-3 in
+      B_queue.push self.events
+      @@ E_enter_manual_span
+           { id = trace_id; time_us; tid; data; name; fun_name; flavor }
+
+    let on_exit_manual_span (self : st) ~time_ns ~tid ~name ~data ~flavor
+        ~trace_id (_ : span) : unit =
+      let time_us = time_ns *. 1e-3 in
+      B_queue.push self.events
+      @@ E_exit_manual_span { tid; id = trace_id; name; time_us; data; flavor }
+  end in
+  let events = B_queue.create () in
+  let t_write =
+    Thread.create
+      (fun () -> Fun.protect ~finally @@ fun () -> bg_thread ~mode ~out events)
+      ()
+  in
 
-    let counter_float ~data:_ name f =
-      let time_us = now_us () in
-      let tid = get_tid_ () in
-      B_queue.push events (E_counter { name; n = f; time_us; tid })
+  (* ticker thread, regularly sends a message to the writer thread.
+      no need to join it. *)
+  let _t_tick : Thread.t = Thread.create (fun () -> tick_thread events) () in
+  let st : Internal_st.t = { active = A.make true; events; t_write } in
+  Sub.Subscriber.Sub { st; callbacks = (module M) }
 
-    let counter_int ~data name i = counter_float ~data name (float_of_int i)
-    let name_process name : unit = B_queue.push events (E_name_process { name })
+let collector_ ~(finally : unit -> unit) ~(mode : [ `Single | `Jsonl ]) ~out ()
+    : collector =
+  let sub = subscriber_ ~finally ~mode ~out () in
+  Sub.collector sub
 
-    let name_thread name : unit =
-      let tid = get_tid_ () in
-      B_queue.push events (E_name_thread { tid; name })
-  end in
-  (module M)
+let[@inline] subscriber ~out () : Sub.t =
+  subscriber_ ~finally:ignore ~mode:`Single ~out ()
 
 let[@inline] collector ~out () : collector =
   collector_ ~finally:ignore ~mode:`Single ~out ()
@@ -462,10 +401,18 @@ let with_setup ?out () f =
   setup ?out ();
   Fun.protect ~finally:Trace_core.shutdown f
 
-module Internal_ = struct
-  let mock_all_ () = Mock_.enabled := true
+module Private_ = struct
+  let mock_all_ () =
+    Mock_.enabled := true;
+    Sub.Private_.get_now_ns_ := Some Mock_.get_now_ns;
+    Sub.Private_.get_tid_ := Some Mock_.get_tid_;
+    ()
+
   let on_tracing_error = on_tracing_error
 
+  let subscriber_jsonl ~finally ~out () =
+    subscriber_ ~finally ~mode:`Jsonl ~out ()
+
   let collector_jsonl ~finally ~out () : collector =
     collector_ ~finally ~mode:`Jsonl ~out ()
 
diff --git a/src/tef/trace_tef.mli b/src/tef/trace_tef.mli
index 6c73f13..d9529b5 100644
--- a/src/tef/trace_tef.mli
+++ b/src/tef/trace_tef.mli
@@ -1,8 +1,3 @@
-val collector :
-  out:[ `File of string | `Stderr | `Stdout ] -> unit -> Trace_core.collector
-(** Make a collector that writes into the given output.
-    See {!setup} for more details. *)
-
 type output =
   [ `Stdout
   | `Stderr
@@ -16,6 +11,14 @@ type output =
         named "foo"
 *)
 
+val subscriber : out:[< output ] -> unit -> Trace_subscriber.t
+(** A subscriber emitting TEF traces into [out].
+    @since NEXT_RELEASE *)
+
+val collector : out:[< output ] -> unit -> Trace_core.collector
+(** Make a collector that writes into the given output.
+    See {!setup} for more details. *)
+
 val setup : ?out:[ output | `Env ] -> unit -> unit
 (** [setup ()] installs the collector depending on [out].
 
@@ -39,12 +42,18 @@ val with_setup : ?out:[ output | `Env ] -> unit -> (unit -> 'a) -> 'a
 
 (**/**)
 
-module Internal_ : sig
+module Private_ : sig
   val mock_all_ : unit -> unit
   (** use fake, deterministic timestamps, TID, PID *)
 
   val on_tracing_error : (string -> unit) ref
 
+  val subscriber_jsonl :
+    finally:(unit -> unit) ->
+    out:[ `File_append of string | `Output of out_channel ] ->
+    unit ->
+    Trace_subscriber.t
+
   val collector_jsonl :
     finally:(unit -> unit) ->
     out:[ `File_append of string | `Output of out_channel ] ->
diff --git a/test/t1.expected b/test/t1.expected
index e570218..9ffcb82 100644
--- a/test/t1.expected
+++ b/test/t1.expected
@@ -1,1053 +1,1053 @@
 [{"pid":2,"name":"process_name","ph":"M","args": {"name":"main"}},
 {"pid":2,"tid": 3,"name":"thread_name","ph":"M","args": {"name":"t1"}},
-{"pid":2,"cat":"trace","id":1,"tid": 3,"ts": 1.00,"name":"fake_sleep","ph":"b"},
-{"pid":2,"cat":"","tid": 3,"ts": 3.00,"name":"hello 1 2","ph":"I"},
-{"pid":2,"cat":"","tid": 3,"ts": 4.00,"name":"world","ph":"I"},
-{"pid":2,"tid":3,"ts":5.00,"name":"c","ph":"C","args": {"n":1}},
-{"pid":2,"cat":"trace","id":1,"tid": 3,"ts": 6.00,"name":"sub-sleep","ph":"b"},
-{"pid":2,"cat":"trace","id":1,"tid": 3,"ts": 7.00,"name":"sub-sleep","ph":"e"},
-{"pid":2,"cat":"","tid": 3,"dur": 6.00,"ts": 2.00,"name":"inner.loop","ph":"X","args": {"j":2,"i":1}},
-{"pid":2,"cat":"","tid": 3,"ts": 10.00,"name":"hello 1 3","ph":"I"},
-{"pid":2,"cat":"","tid": 3,"ts": 11.00,"name":"world","ph":"I"},
-{"pid":2,"tid":3,"ts":12.00,"name":"c","ph":"C","args": {"n":2}},
-{"pid":2,"cat":"trace","id":1,"tid": 3,"ts": 13.00,"name":"fake_sleep","ph":"e","args": {"slept":true}},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 9.00,"name":"inner.loop","ph":"X","args": {"i":1}},
-{"pid":2,"cat":"","tid": 3,"ts": 16.00,"name":"hello 1 4","ph":"I"},
-{"pid":2,"cat":"","tid": 3,"ts": 17.00,"name":"world","ph":"I"},
-{"pid":2,"tid":3,"ts":18.00,"name":"c","ph":"C","args": {"n":3}},
-{"pid":2,"cat":"","tid": 3,"dur": 4.00,"ts": 15.00,"name":"inner.loop","ph":"X","args": {"i":1}},
-{"pid":2,"cat":"","tid": 3,"ts": 21.00,"name":"hello 1 5","ph":"I"},
-{"pid":2,"cat":"","tid": 3,"ts": 22.00,"name":"world","ph":"I"},
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-{"pid":2,"cat":"","tid": 3,"dur": 25.00,"ts": 0.00,"name":"outer.loop","ph":"X"},
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-{"pid":2,"cat":"","tid": 3,"ts": 42.00,"name":"hello 2 4","ph":"I"},
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-{"pid":2,"cat":"","tid": 3,"dur": 4.00,"ts": 41.00,"name":"inner.loop","ph":"X","args": {"i":2}},
-{"pid":2,"cat":"","tid": 3,"ts": 47.00,"name":"hello 2 5","ph":"I"},
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-{"pid":2,"cat":"","tid": 3,"dur": 25.00,"ts": 26.00,"name":"outer.loop","ph":"X"},
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-{"pid":2,"cat":"","tid": 3,"dur": 25.00,"ts": 78.00,"name":"outer.loop","ph":"X"},
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-{"pid":2,"cat":"","tid": 3,"ts": 107.00,"name":"hello 5 2","ph":"I"},
-{"pid":2,"cat":"","tid": 3,"ts": 108.00,"name":"world","ph":"I"},
-{"pid":2,"tid":3,"ts":109.00,"name":"c","ph":"C","args": {"n":17}},
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+{"pid":2,"cat":"","tid": 3,"dur": 25.00,"ts": 1173.00,"name":"outer.loop","ph":"X"},
+{"pid":2,"cat":"trace","id":46,"tid": 3,"ts": 1200.00,"name":"fake_sleep","ph":"b"},
+{"pid":2,"cat":"","tid": 3,"ts": 1202.00,"name":"hello 47 2","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1203.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1204.00,"name":"c","ph":"C","args": {"n":185}},
+{"pid":2,"cat":"trace","id":46,"tid": 3,"ts": 1205.00,"name":"sub-sleep","ph":"b"},
+{"pid":2,"cat":"trace","id":46,"tid": 3,"ts": 1206.00,"name":"sub-sleep","ph":"e"},
+{"pid":2,"cat":"","tid": 3,"dur": 6.00,"ts": 1201.00,"name":"inner.loop","ph":"X","args": {"j":2,"i":47}},
+{"pid":2,"cat":"","tid": 3,"ts": 1209.00,"name":"hello 47 3","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1210.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1211.00,"name":"c","ph":"C","args": {"n":186}},
+{"pid":2,"cat":"trace","id":46,"tid": 3,"ts": 1212.00,"name":"fake_sleep","ph":"e","args": {"slept":true}},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 1208.00,"name":"inner.loop","ph":"X","args": {"i":47}},
+{"pid":2,"cat":"","tid": 3,"ts": 1215.00,"name":"hello 47 4","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1216.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1217.00,"name":"c","ph":"C","args": {"n":187}},
+{"pid":2,"cat":"","tid": 3,"dur": 4.00,"ts": 1214.00,"name":"inner.loop","ph":"X","args": {"i":47}},
+{"pid":2,"cat":"","tid": 3,"ts": 1220.00,"name":"hello 47 5","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1221.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1222.00,"name":"c","ph":"C","args": {"n":188}},
+{"pid":2,"cat":"","tid": 3,"dur": 4.00,"ts": 1219.00,"name":"inner.loop","ph":"X","args": {"i":47}},
+{"pid":2,"cat":"","tid": 3,"dur": 25.00,"ts": 1199.00,"name":"outer.loop","ph":"X"},
+{"pid":2,"cat":"trace","id":47,"tid": 3,"ts": 1226.00,"name":"fake_sleep","ph":"b"},
+{"pid":2,"cat":"","tid": 3,"ts": 1228.00,"name":"hello 48 2","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1229.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1230.00,"name":"c","ph":"C","args": {"n":189}},
+{"pid":2,"cat":"trace","id":47,"tid": 3,"ts": 1231.00,"name":"sub-sleep","ph":"B"},
+{"pid":2,"cat":"trace","id":47,"tid": 3,"ts": 1232.00,"name":"sub-sleep","ph":"E"},
+{"pid":2,"cat":"","tid": 3,"dur": 6.00,"ts": 1227.00,"name":"inner.loop","ph":"X","args": {"j":2,"i":48}},
+{"pid":2,"cat":"","tid": 3,"ts": 1235.00,"name":"hello 48 3","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1236.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1237.00,"name":"c","ph":"C","args": {"n":190}},
+{"pid":2,"cat":"trace","id":47,"tid": 3,"ts": 1238.00,"name":"fake_sleep","ph":"e","args": {"slept":true}},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 1234.00,"name":"inner.loop","ph":"X","args": {"i":48}},
+{"pid":2,"cat":"","tid": 3,"ts": 1241.00,"name":"hello 48 4","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1242.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1243.00,"name":"c","ph":"C","args": {"n":191}},
+{"pid":2,"cat":"","tid": 3,"dur": 4.00,"ts": 1240.00,"name":"inner.loop","ph":"X","args": {"i":48}},
+{"pid":2,"cat":"","tid": 3,"ts": 1246.00,"name":"hello 48 5","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1247.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1248.00,"name":"c","ph":"C","args": {"n":192}},
+{"pid":2,"cat":"","tid": 3,"dur": 4.00,"ts": 1245.00,"name":"inner.loop","ph":"X","args": {"i":48}},
+{"pid":2,"cat":"","tid": 3,"dur": 25.00,"ts": 1225.00,"name":"outer.loop","ph":"X"},
+{"pid":2,"cat":"trace","id":48,"tid": 3,"ts": 1252.00,"name":"fake_sleep","ph":"b"},
+{"pid":2,"cat":"","tid": 3,"ts": 1254.00,"name":"hello 49 2","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1255.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1256.00,"name":"c","ph":"C","args": {"n":193}},
+{"pid":2,"cat":"trace","id":48,"tid": 3,"ts": 1257.00,"name":"sub-sleep","ph":"b"},
+{"pid":2,"cat":"trace","id":48,"tid": 3,"ts": 1258.00,"name":"sub-sleep","ph":"e"},
+{"pid":2,"cat":"","tid": 3,"dur": 6.00,"ts": 1253.00,"name":"inner.loop","ph":"X","args": {"j":2,"i":49}},
+{"pid":2,"cat":"","tid": 3,"ts": 1261.00,"name":"hello 49 3","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1262.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1263.00,"name":"c","ph":"C","args": {"n":194}},
+{"pid":2,"cat":"trace","id":48,"tid": 3,"ts": 1264.00,"name":"fake_sleep","ph":"e","args": {"slept":true}},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 1260.00,"name":"inner.loop","ph":"X","args": {"i":49}},
+{"pid":2,"cat":"","tid": 3,"ts": 1267.00,"name":"hello 49 4","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1268.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1269.00,"name":"c","ph":"C","args": {"n":195}},
+{"pid":2,"cat":"","tid": 3,"dur": 4.00,"ts": 1266.00,"name":"inner.loop","ph":"X","args": {"i":49}},
+{"pid":2,"cat":"","tid": 3,"ts": 1272.00,"name":"hello 49 5","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1273.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1274.00,"name":"c","ph":"C","args": {"n":196}},
+{"pid":2,"cat":"","tid": 3,"dur": 4.00,"ts": 1271.00,"name":"inner.loop","ph":"X","args": {"i":49}},
+{"pid":2,"cat":"","tid": 3,"dur": 25.00,"ts": 1251.00,"name":"outer.loop","ph":"X"},
+{"pid":2,"cat":"trace","id":49,"tid": 3,"ts": 1278.00,"name":"fake_sleep","ph":"b"},
+{"pid":2,"cat":"","tid": 3,"ts": 1280.00,"name":"hello 50 2","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1281.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1282.00,"name":"c","ph":"C","args": {"n":197}},
+{"pid":2,"cat":"trace","id":49,"tid": 3,"ts": 1283.00,"name":"sub-sleep","ph":"b"},
+{"pid":2,"cat":"trace","id":49,"tid": 3,"ts": 1284.00,"name":"sub-sleep","ph":"e"},
+{"pid":2,"cat":"","tid": 3,"dur": 6.00,"ts": 1279.00,"name":"inner.loop","ph":"X","args": {"j":2,"i":50}},
+{"pid":2,"cat":"","tid": 3,"ts": 1287.00,"name":"hello 50 3","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1288.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1289.00,"name":"c","ph":"C","args": {"n":198}},
+{"pid":2,"cat":"trace","id":49,"tid": 3,"ts": 1290.00,"name":"fake_sleep","ph":"e","args": {"slept":true}},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 1286.00,"name":"inner.loop","ph":"X","args": {"i":50}},
+{"pid":2,"cat":"","tid": 3,"ts": 1293.00,"name":"hello 50 4","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1294.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1295.00,"name":"c","ph":"C","args": {"n":199}},
+{"pid":2,"cat":"","tid": 3,"dur": 4.00,"ts": 1292.00,"name":"inner.loop","ph":"X","args": {"i":50}},
+{"pid":2,"cat":"","tid": 3,"ts": 1298.00,"name":"hello 50 5","ph":"I"},
+{"pid":2,"cat":"","tid": 3,"ts": 1299.00,"name":"world","ph":"I"},
+{"pid":2,"tid":3,"ts":1300.00,"name":"c","ph":"C","args": {"n":200}},
+{"pid":2,"cat":"","tid": 3,"dur": 4.00,"ts": 1297.00,"name":"inner.loop","ph":"X","args": {"i":50}},
+{"pid":2,"cat":"","tid": 3,"dur": 25.00,"ts": 1277.00,"name":"outer.loop","ph":"X"},
+{"pid":2,"cat":"","tid": 1,"ts": 1304.00,"name":"tef-worker.exit","ph":"I"}]
\ No newline at end of file
diff --git a/test/t1.ml b/test/t1.ml
index 87e4792..b96a81f 100644
--- a/test/t1.ml
+++ b/test/t1.ml
@@ -25,9 +25,9 @@ let run () =
           Trace.enter_manual_sub_span ~parent:pseudo_async_sp
             ~flavor:
               (if _i mod 3 = 0 then
-                `Sync
-              else
-                `Async)
+                 `Sync
+               else
+                 `Async)
             ~__FILE__ ~__LINE__ "sub-sleep"
         in
 
@@ -43,5 +43,5 @@ let run () =
   done
 
 let () =
-  Trace_tef.Internal_.mock_all_ ();
+  Trace_tef.Private_.mock_all_ ();
   Trace_tef.with_setup ~out:`Stdout () @@ fun () -> run ()
diff --git a/test/t2.expected b/test/t2.expected
index 673448c..5d8c042 100644
--- a/test/t2.expected
+++ b/test/t2.expected
@@ -1,933 +1,933 @@
 [{"pid":2,"name":"process_name","ph":"M","args": {"name":"main"}},
 {"pid":2,"tid": 3,"name":"thread_name","ph":"M","args": {"name":"t1"}},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 6.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 8.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 5.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 12.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 9.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 11.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 8.00,"name":"fib","ph":"X"},
 {"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 15.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 17.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 14.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 11.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 17.00,"ts": 4.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 24.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 18.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 20.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 17.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 14.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 17.00,"ts": 7.00,"name":"fib","ph":"X"},
 {"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 27.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 29.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 26.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 23.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 35.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 37.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 34.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 41.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 30.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 32.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 29.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 26.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 38.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 40.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 37.00,"name":"fib","ph":"X"},
 {"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 44.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 46.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 43.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 40.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 17.00,"ts": 33.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 29.00,"ts": 22.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 49.00,"ts": 3.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 56.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 47.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 49.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 46.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 43.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 17.00,"ts": 36.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 29.00,"ts": 25.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 49.00,"ts": 6.00,"name":"fib","ph":"X"},
 {"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 59.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 61.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 58.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 55.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 67.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 69.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 66.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 73.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 62.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 64.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 61.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 58.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 70.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 72.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 69.00,"name":"fib","ph":"X"},
 {"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 76.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 78.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 75.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 72.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 17.00,"ts": 65.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 29.00,"ts": 54.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 87.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 89.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 86.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 93.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 79.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 81.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 78.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 75.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 17.00,"ts": 68.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 29.00,"ts": 57.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 90.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 92.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 89.00,"name":"fib","ph":"X"},
 {"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 96.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 98.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 95.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 92.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 17.00,"ts": 85.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 105.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 99.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 101.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 98.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 95.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 17.00,"ts": 88.00,"name":"fib","ph":"X"},
 {"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 108.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 110.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 107.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 104.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 116.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 118.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 115.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 122.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 111.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 113.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 110.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 107.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 119.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 121.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 118.00,"name":"fib","ph":"X"},
 {"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 125.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 127.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 124.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 121.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 17.00,"ts": 114.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 29.00,"ts": 103.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 49.00,"ts": 84.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 81.00,"ts": 53.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 133.00,"ts": 2.00,"name":"fib","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 140.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 128.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 130.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 127.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 9.00,"ts": 124.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 17.00,"ts": 117.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 29.00,"ts": 106.00,"name":"fib","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 49.00,"ts": 87.00,"name":"fib","ph":"X"},
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 {"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 1816.00,"name":"Dune__exe__T2.fib2","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 1818.00,"name":"Dune__exe__T2.fib2","ph":"X"},
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 {"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 1828.00,"name":"Dune__exe__T2.fib2","ph":"X"},
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-{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 1827.00,"name":"Dune__exe__T2.fib2","ph":"X"},
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 {"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 1845.00,"name":"Dune__exe__T2.fib2","ph":"X"},
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-{"pid":2,"cat":"","tid": 3,"dur": 49.00,"ts": 1804.00,"name":"Dune__exe__T2.fib2","ph":"X"},
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-{"pid":2,"cat":"","tid": 3,"dur": 133.00,"ts": 1722.00,"name":"Dune__exe__T2.fib2","ph":"X"},
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-{"pid":2,"cat":"","tid": 3,"dur": 353.00,"ts": 1504.00,"name":"Dune__exe__T2.fib2","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 573.00,"ts": 1285.00,"name":"Dune__exe__T2.fib2","ph":"X"},
-{"pid":2,"cat":"","tid": 3,"dur": 929.00,"ts": 930.00,"name":"Dune__exe__T2.fib2","ph":"X"},
-{"pid":2,"cat":"","tid": 1,"ts": 1860.00,"name":"tef-worker.exit","ph":"I"}]
\ No newline at end of file
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 1848.00,"name":"Dune__exe__T2.fib2","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 1.00,"ts": 1850.00,"name":"Dune__exe__T2.fib2","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 5.00,"ts": 1847.00,"name":"Dune__exe__T2.fib2","ph":"X"},
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+{"pid":2,"cat":"","tid": 3,"dur": 217.00,"ts": 1642.00,"name":"Dune__exe__T2.fib2","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 353.00,"ts": 1507.00,"name":"Dune__exe__T2.fib2","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 573.00,"ts": 1288.00,"name":"Dune__exe__T2.fib2","ph":"X"},
+{"pid":2,"cat":"","tid": 3,"dur": 929.00,"ts": 933.00,"name":"Dune__exe__T2.fib2","ph":"X"},
+{"pid":2,"cat":"","tid": 1,"ts": 1864.00,"name":"tef-worker.exit","ph":"I"}]
\ No newline at end of file
diff --git a/test/t2.ml b/test/t2.ml
index 1ad9de9..e2868c9 100644
--- a/test/t2.ml
+++ b/test/t2.ml
@@ -14,7 +14,7 @@ let%trace rec fib2 x =
     fib2 (x - 1) + fib2 (x - 2)
 
 let () =
-  Trace_tef.Internal_.mock_all_ ();
+  Trace_tef.Private_.mock_all_ ();
   let@ () = Trace_tef.with_setup ~out:`Stdout () in
 
   Trace_core.set_process_name "main";