Streaming improvements #1 (netdata#19137)

* prefer tinysleep over yielding the processor

* split spinlocks to separate files

* rename spinlock initializers

* Optimize ML queuing operations.

- Allocate 25% of cores for ML.
- Split queues by request type.
- Accurate stats for queue operations by type.

* abstracted circular buffer into a new private structure to enable using it in receiver sending side - no features added yet, only abstracted the existing functionality - not tested yet

* completed the abstraction of stream circular buffer

* unified list of receivers and senders; opcodes now support both receivers and senders

* use strings in pluginsd

* stream receivers send data back to the child using the event loop

* do not share pgc aral between caches

* pgc uses 4 to 256 partitions, by default equal to the number of CPU cores

* add forgotten worker job

* workers now monitor spinlock contention

* stream sender tries to lock the sender, but does not wait for it - it will be handled later

* increase the number of web server threads to the number of cpu cores, with a minimum of 6

* use the nowait versions of nd_sock functions

* handle EAGAIN properly

* add spinlock contention tracing for rw_spinlock

* aral lock/unlock contention tracing

* allocate the compressed buffer

* use 128KiB for aral default page size; limit memory protection to 5GiB

* aral uses mmap() for big pages

* enrich log messages

* renamed telemetry to pulse

* unified sender and receiver socket event loops

* logging improvements

* NETDATA_LOG_STREAM_SENDER logs inbound and outbound traffic

* 16k receiver buffer size to improve interactivity

* fix NETDATA_LOG_STREAM_SENDER in sender_execute

* do not stream ML models for charts and dimensions that have not been exposed

* add support for sending QUIT to plugins and waiting for some time for them to quit gracefully

* global spinlock contention per function

* use an aral per pgc partition; use 8 partitions for PGD

* rrdcalc: do not change the frequency of alerts - it uses arbitrary values used during replication, changing permanently the frequency of alerts
replication: use 1/3 of the cores or 1 core every 10 nodes (min of the two)
pgd: use as many aral partitions as the CPU cores, up to 256

* aral does 1 allocation per page (the structure and the elements together), instead of two

* use the evitor thread only when we run out of memory; restore the optimization about prepending or appending clean pages based on their accesses; use the main cache free memory for the other caches, reducing I/O when the main cache has enough room

* reduce the number of events per poll() to 10

* aral allocates pages of up to 1MiB; restore processing 100 events per nd_poll() call

* drain the sockets while reading

* receiver sockets should be non-blocking

* add stability detector to aral

* increase the receivers send buffer

* do not remove the sender or the receiver while we drain the input sockets

---------

Co-authored-by: vkalintiris <vasilis@netdata.cloud>

CMakeLists.txt

@@ -944,6 +944,10 @@ set(LIBNETDATA_FILES
         src/libnetdata/os/system_memory.h
         src/libnetdata/socket/nd-poll.c
         src/libnetdata/socket/nd-poll.h
+        src/libnetdata/locks/spinlock.c
+        src/libnetdata/locks/spinlock.h
+        src/libnetdata/locks/rw-spinlock.c
+        src/libnetdata/locks/rw-spinlock.h
 )
 
 set(LIBH2O_FILES
@@ -1037,8 +1041,8 @@ set(DAEMON_FILES
         src/daemon/daemon.h
         src/daemon/libuv_workers.c
         src/daemon/libuv_workers.h
-        src/daemon/telemetry/telemetry.c
-        src/daemon/telemetry/telemetry.h
+        src/daemon/pulse/pulse.c
+        src/daemon/pulse/pulse.h
         src/daemon/analytics.c
         src/daemon/analytics.h
         src/daemon/main.c
@@ -1068,36 +1072,36 @@ set(DAEMON_FILES
         src/daemon/dyncfg/dyncfg-internals.h
         src/daemon/dyncfg/dyncfg-intercept.c
         src/daemon/dyncfg/dyncfg-tree.c
-        src/daemon/telemetry/telemetry-http-api.c
-        src/daemon/telemetry/telemetry-http-api.h
-        src/daemon/telemetry/telemetry-queries.c
-        src/daemon/telemetry/telemetry-queries.h
-        src/daemon/telemetry/telemetry-ingestion.c
-        src/daemon/telemetry/telemetry-ingestion.h
-        src/daemon/telemetry/telemetry-ml.c
-        src/daemon/telemetry/telemetry-ml.h
-        src/daemon/telemetry/telemetry-gorilla.c
-        src/daemon/telemetry/telemetry-gorilla.h
-        src/daemon/telemetry/telemetry-daemon.c
-        src/daemon/telemetry/telemetry-daemon.h
-        src/daemon/telemetry/telemetry-daemon-memory.c
-        src/daemon/telemetry/telemetry-daemon-memory.h
-        src/daemon/telemetry/telemetry-sqlite3.c
-        src/daemon/telemetry/telemetry-sqlite3.h
-        src/daemon/telemetry/telemetry-dbengine.c
-        src/daemon/telemetry/telemetry-dbengine.h
-        src/daemon/telemetry/telemetry-string.c
-        src/daemon/telemetry/telemetry-string.h
-        src/daemon/telemetry/telemetry-heartbeat.c
-        src/daemon/telemetry/telemetry-heartbeat.h
-        src/daemon/telemetry/telemetry-dictionary.c
-        src/daemon/telemetry/telemetry-dictionary.h
-        src/daemon/telemetry/telemetry-workers.c
-        src/daemon/telemetry/telemetry-workers.h
-        src/daemon/telemetry/telemetry-trace-allocations.c
-        src/daemon/telemetry/telemetry-trace-allocations.h
-        src/daemon/telemetry/telemetry-aral.c
-        src/daemon/telemetry/telemetry-aral.h
+        src/daemon/pulse/pulse-http-api.c
+        src/daemon/pulse/pulse-http-api.h
+        src/daemon/pulse/pulse-queries.c
+        src/daemon/pulse/pulse-queries.h
+        src/daemon/pulse/pulse-ingestion.c
+        src/daemon/pulse/pulse-ingestion.h
+        src/daemon/pulse/pulse-ml.c
+        src/daemon/pulse/pulse-ml.h
+        src/daemon/pulse/pulse-gorilla.c
+        src/daemon/pulse/pulse-gorilla.h
+        src/daemon/pulse/pulse-daemon.c
+        src/daemon/pulse/pulse-daemon.h
+        src/daemon/pulse/pulse-daemon-memory.c
+        src/daemon/pulse/pulse-daemon-memory.h
+        src/daemon/pulse/pulse-sqlite3.c
+        src/daemon/pulse/pulse-sqlite3.h
+        src/daemon/pulse/pulse-dbengine.c
+        src/daemon/pulse/pulse-dbengine.h
+        src/daemon/pulse/pulse-string.c
+        src/daemon/pulse/pulse-string.h
+        src/daemon/pulse/pulse-heartbeat.c
+        src/daemon/pulse/pulse-heartbeat.h
+        src/daemon/pulse/pulse-dictionary.c
+        src/daemon/pulse/pulse-dictionary.h
+        src/daemon/pulse/pulse-workers.c
+        src/daemon/pulse/pulse-workers.h
+        src/daemon/pulse/pulse-trace-allocations.c
+        src/daemon/pulse/pulse-trace-allocations.h
+        src/daemon/pulse/pulse-aral.c
+        src/daemon/pulse/pulse-aral.h
         src/daemon/config/netdata-conf-db.c
         src/daemon/config/netdata-conf-db.h
         src/daemon/config/netdata-conf.h
@@ -1543,6 +1547,8 @@ set(STREAMING_PLUGIN_FILES
         src/streaming/stream-receiver-connection.c
         src/streaming/stream-sender-commit.h
         src/streaming/stream-traffic-types.h
+        src/streaming/stream-circular-buffer.c
+        src/streaming/stream-circular-buffer.h
 )
 
 set(WEB_PLUGIN_FILES

src/aclk/aclk_query.c

@@ -16,7 +16,7 @@ struct pending_req_list {
 };
 
 static struct pending_req_list *pending_req_list_head = NULL;
-static SPINLOCK pending_req_list_lock = NETDATA_SPINLOCK_INITIALIZER;
+static SPINLOCK pending_req_list_lock = SPINLOCK_INITIALIZER;
 
 void aclk_config_get_query_scope(void) {
     const char *s = config_get(CONFIG_SECTION_CLOUD, "scope", "full");

src/aclk/https_client.c

@@ -6,7 +6,7 @@
 
 #include "aclk_util.h"
 
-#include "daemon/telemetry/telemetry.h"
+#include "daemon/pulse/pulse.h"
 
 static const char *http_req_type_to_str(http_req_type_t req) {
     switch (req) {

src/claim/claim-with-api.c

@@ -361,7 +361,7 @@ static bool send_curl_request(const char *machine_guid, const char *hostname, co
 }
 
 bool claim_agent(const char *url, const char *token, const char *rooms, const char *proxy, bool insecure) {
-    static SPINLOCK spinlock = NETDATA_SPINLOCK_INITIALIZER;
+    static SPINLOCK spinlock = SPINLOCK_INITIALIZER;
     spinlock_lock(&spinlock);
 
     if (!check_and_generate_certificates()) {
@@ -411,7 +411,7 @@ bool claim_agent_from_environment(void) {
 
 bool claim_agent_from_claim_conf(void) {
     static struct config claim_config = APPCONFIG_INITIALIZER;
-    static SPINLOCK spinlock = NETDATA_SPINLOCK_INITIALIZER;
+    static SPINLOCK spinlock = SPINLOCK_INITIALIZER;
     bool ret = false;
 
     spinlock_lock(&spinlock);

src/claim/claim_id.c

@@ -7,7 +7,7 @@ static struct {
     ND_UUID claim_uuid;
     ND_UUID claim_uuid_saved;
 } claim = {
-    .spinlock = NETDATA_SPINLOCK_INITIALIZER,
+    .spinlock = SPINLOCK_INITIALIZER,
 };
 
 void claim_id_clear_previous_working(void) {

src/collectors/cgroups.plugin/cgroup-network.c

@@ -554,7 +554,7 @@ static void read_from_spawned(SPAWN_INSTANCE *si, const char *name __maybe_unuse
     }
     fclose(fp);
     spawn_server_instance_read_fd_unset(si);
-    spawn_server_exec_kill(spawn_server, si);
+    spawn_server_exec_kill(spawn_server, si, 0);
 }
 
 void detect_veth_interfaces_spawn(pid_t pid) {

src/collectors/ebpf.plugin/ebpf_apps.c

@@ -307,7 +307,7 @@ int ebpf_read_apps_groups_conf(struct ebpf_target **agdt, struct ebpf_target **a
 #define MAX_CMDLINE 16384
 
 Pvoid_t ebpf_pid_judyL = NULL;
-SPINLOCK ebpf_pid_spinlock = NETDATA_SPINLOCK_INITIALIZER;
+SPINLOCK ebpf_pid_spinlock = SPINLOCK_INITIALIZER;
 
 void ebpf_pid_del(pid_t pid)
 {

src/collectors/freeipmi.plugin/freeipmi_plugin.c

@@ -1959,7 +1959,7 @@ int main (int argc, char **argv) {
     struct ipmi_collection_thread sensors_data = {
             .type = IPMI_COLLECT_TYPE_SENSORS,
             .freq_s = update_every,
-            .spinlock = NETDATA_SPINLOCK_INITIALIZER,
+            .spinlock = SPINLOCK_INITIALIZER,
             .debug = debug,
             .state = {
                     .debug = debug,
@@ -1974,7 +1974,7 @@ int main (int argc, char **argv) {
     }, sel_data = {
             .type = IPMI_COLLECT_TYPE_SEL,
             .freq_s = update_every_sel,
-            .spinlock = NETDATA_SPINLOCK_INITIALIZER,
+            .spinlock = SPINLOCK_INITIALIZER,
             .debug = debug,
             .state = {
                     .debug = debug,

src/collectors/proc.plugin/proc_net_dev_renames.c

@@ -15,7 +15,7 @@ static void dictionary_netdev_rename_delete_cb(const DICTIONARY_ITEM *item __may
 }
 
 void netdev_renames_init(void) {
-    static SPINLOCK spinlock = NETDATA_SPINLOCK_INITIALIZER;
+    static SPINLOCK spinlock = SPINLOCK_INITIALIZER;
 
     spinlock_lock(&spinlock);
     if(!netdev_renames) {

src/collectors/statsd.plugin/statsd.c

@@ -2654,7 +2654,7 @@ void *statsd_main(void *ptr) {
     RRDSET *st_pcharts = NULL;
     RRDDIM *rd_pcharts = NULL;
 
-    if(telemetry_enabled) {
+    if(pulse_enabled) {
         st_metrics = rrdset_create_localhost(
             "netdata",
             "statsd_metrics",
@@ -2851,7 +2851,7 @@ void *statsd_main(void *ptr) {
         if(unlikely(!service_running(SERVICE_COLLECTORS)))
             break;
 
-        if(telemetry_enabled) {
+        if(pulse_enabled) {
             rrddim_set_by_pointer(st_metrics, rd_metrics_gauge,        (collected_number)statsd.gauges.metrics);
             rrddim_set_by_pointer(st_metrics, rd_metrics_counter,      (collected_number)statsd.counters.metrics);
             rrddim_set_by_pointer(st_metrics, rd_metrics_timer,        (collected_number)statsd.timers.metrics);

src/collectors/systemd-journal.plugin/systemd-journal-files.c

@@ -704,7 +704,7 @@ int filenames_compar(const void *a, const void *b) {
 }
 
 void journal_files_registry_update(void) {
-    static SPINLOCK spinlock = NETDATA_SPINLOCK_INITIALIZER;
+    static SPINLOCK spinlock = SPINLOCK_INITIALIZER;
 
     if(spinlock_trylock(&spinlock)) {
         usec_t scan_monotonic_ut = now_monotonic_usec();

src/collectors/tc.plugin/plugin_tc.c

@@ -1135,7 +1135,7 @@ void *tc_main(void *ptr) {
         }
 
         // fgets() failed or loop broke
-        int code = spawn_popen_kill(tc_child_instance);
+        int code = spawn_popen_kill(tc_child_instance, 0);
         tc_child_instance = NULL;
 
         if(unlikely(device)) {

src/collectors/windows-events.plugin/windows-events-providers.c

@@ -75,7 +75,7 @@ static struct {
     ARAL *aral_providers;
     ARAL *aral_handles;
 } pbc = {
-        .spinlock = NETDATA_SPINLOCK_INITIALIZER,
+        .spinlock = SPINLOCK_INITIALIZER,
 };
 
 static void provider_load_list(PROVIDER_META_HANDLE *h, WEVT_VARIANT *content, WEVT_VARIANT *property,

src/collectors/windows-events.plugin/windows-events-sources.c

@@ -484,7 +484,7 @@ WEVT_SOURCE_TYPE categorize_channel(const wchar_t *channel_path, const char **pr
 }
 
 void wevt_sources_scan(void) {
-    static SPINLOCK spinlock = NETDATA_SPINLOCK_INITIALIZER;
+    static SPINLOCK spinlock = SPINLOCK_INITIALIZER;
     LPWSTR channel = NULL;
     EVT_HANDLE hChannelEnum = NULL;
 

src/daemon/buildinfo.c

@@ -1263,7 +1263,7 @@ __attribute__((constructor)) void initialize_build_info(void) {
 int get_system_info(struct rrdhost_system_info *system_info);
 static void populate_system_info(void) {
     static bool populated = false;
-    static SPINLOCK spinlock = NETDATA_SPINLOCK_INITIALIZER;
+    static SPINLOCK spinlock = SPINLOCK_INITIALIZER;
 
     if(populated)
         return;

src/daemon/common.h

@@ -19,7 +19,7 @@ extern "C" {
 #include "daemon/config/netdata-conf.h"
 #include "daemon/dyncfg/dyncfg.h"
 
-#include "daemon/telemetry/telemetry.h"
+#include "daemon/pulse/pulse.h"
 
 // health monitoring and alarm notifications
 #include "health/health.h"

src/daemon/config/netdata-conf-backwards-compatibility.c

@@ -181,14 +181,26 @@ void netdata_conf_backwards_compatibility(void) {
     config_move(CONFIG_SECTION_GLOBAL,  "enable zero metrics",
                 CONFIG_SECTION_DB,      "enable zero metrics");
 
-    config_move("global statistics",        "update every",
-                CONFIG_SECTION_TELEMETRY,   "update every");
+    // ----------------------------------------------------------------------------------------------------------------
+    // global statistics -> telemetry -> pulse
 
     config_move(CONFIG_SECTION_PLUGINS, "netdata monitoring",
-                CONFIG_SECTION_PLUGINS, "netdata telemetry");
+                CONFIG_SECTION_PLUGINS, "netdata pulse");
+
+    config_move(CONFIG_SECTION_PLUGINS, "netdata telemetry",
+                CONFIG_SECTION_PLUGINS, "netdata pulse");
 
     config_move(CONFIG_SECTION_PLUGINS, "netdata monitoring extended",
-                CONFIG_SECTION_TELEMETRY, "extended telemetry");
+                CONFIG_SECTION_PULSE,   "extended");
+
+    config_move("telemetry",            "extended telemetry",
+                CONFIG_SECTION_PULSE,   "extended");
+
+    config_move("global statistics",    "update every",
+                CONFIG_SECTION_PULSE,   "update every");
+
+    config_move("telemetry",            "update every",
+                CONFIG_SECTION_PULSE,   "update every");
 
 
     // ----------------------------------------------------------------------------------------------------------------

src/daemon/config/netdata-conf-db.c

@@ -145,8 +145,11 @@ void netdata_conf_dbengine_init(const char *hostname) {
     OS_SYSTEM_MEMORY sm = os_system_memory(true);
     if(sm.ram_total_bytes && sm.ram_available_bytes && sm.ram_total_bytes > sm.ram_available_bytes) {
         // calculate the default out of memory protection size
+        uint64_t keep_free = sm.ram_total_bytes / 10;
+        if(keep_free > 5ULL * 1024 * 1024 * 1024)
+            keep_free = 5ULL * 1024 * 1024 * 1024;
         char buf[64];
-        size_snprintf(buf, sizeof(buf), sm.ram_total_bytes / 10, "B", false);
+        size_snprintf(buf, sizeof(buf), keep_free, "B", false);
         size_parse(buf, &dbengine_out_of_memory_protection, "B");
     }
 

src/daemon/main.c

@@ -1424,14 +1424,14 @@ int netdata_main(int argc, char **argv) {
             default_stacksize = 1 * 1024 * 1024;
 
 #ifdef NETDATA_INTERNAL_CHECKS
-        telemetry_enabled = true;
-        telemetry_extended_enabled = true;
+        pulse_enabled = true;
+        pulse_extended_enabled = true;
 #endif
 
-        telemetry_extended_enabled =
-            config_get_boolean(CONFIG_SECTION_TELEMETRY, "extended telemetry", telemetry_extended_enabled);
+        pulse_extended_enabled =
+            config_get_boolean(CONFIG_SECTION_PULSE, "extended", pulse_extended_enabled);
 
-        if(telemetry_extended_enabled)
+        if(pulse_extended_enabled)
             // this has to run before starting any other threads that use workers
             workers_utilization_enable();
 

src/daemon/telemetry/telemetry-aral.c → src/daemon/pulse/pulse-aral.c

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 
-#define TELEMETRY_INTERNALS 1
-#include "telemetry-aral.h"
+#define PULSE_INTERNALS 1
+#include "pulse-aral.h"
 
 struct aral_info {
     const char *name;
@@ -19,7 +19,7 @@ static struct {
     ARAL_STATS_JudyLSet idx;
 } globals = { 0 };
 
-static void telemetry_aral_register_statistics(struct aral_statistics *stats, const char *name) {
+static void pulse_aral_register_statistics(struct aral_statistics *stats, const char *name) {
     if(!name || !stats)
         return;
 
@@ -33,18 +33,18 @@ static void telemetry_aral_register_statistics(struct aral_statistics *stats, co
     spinlock_unlock(&globals.spinlock);
 }
 
-void telemetry_aral_register(ARAL *ar, const char *name) {
+void pulse_aral_register(ARAL *ar, const char *name) {
     if(!ar) return;
 
     if(!name)
         name = aral_name(ar);
 
     struct aral_statistics *stats = aral_get_statistics(ar);
 
-    telemetry_aral_register_statistics(stats, name);
+    pulse_aral_register_statistics(stats, name);
 }
 
-void telemetry_aral_unregister(ARAL *ar) {
+void pulse_aral_unregister(ARAL *ar) {
     if(!ar) return;
     struct aral_statistics *stats = aral_get_statistics(ar);
 
@@ -58,11 +58,11 @@ void telemetry_aral_unregister(ARAL *ar) {
     spinlock_unlock(&globals.spinlock);
 }
 
-void telemerty_aral_init(void) {
-    telemetry_aral_register_statistics(aral_by_size_statistics(), "by-size");
+void pulse_aral_init(void) {
+    pulse_aral_register_statistics(aral_by_size_statistics(), "by-size");
 }
 
-void telemetry_aral_do(bool extended) {
+void pulse_aral_do(bool extended) {
     if(!extended) return;
 
     spinlock_lock(&globals.spinlock);
@@ -111,7 +111,7 @@ void telemetry_aral_do(bool extended) {
                     "Array Allocator Memory Utilization",
                     "bytes",
                     "netdata",
-                    "telemetry",
+                    "pulse",
                     910000,
                     localhost->rrd_update_every,
                     RRDSET_TYPE_STACKED);
@@ -145,7 +145,7 @@ void telemetry_aral_do(bool extended) {
                     "Array Allocator Memory Utilization",
                     "%",
                     "netdata",
-                    "telemetry",
+                    "pulse",
                     910001,
                     localhost->rrd_update_every,
                     RRDSET_TYPE_LINE);