Improve import time #1846

mgu · 2023-01-14T21:36:10Z

The goal of this PR is to discuss some small improvements that could be made to improve the import time of uvicorn.
There are 3 changes here:

Do not load yaml until we have to parse a yaml file
Do not load h11 when httptools is used
Do not load Reload classes (and dependencies) when reload is not enable. Same for Multiprocess when there are no more than 1 worker

On my computer, the import time is reduced from ~60ms to ~35ms.
I don't know if the benefit is worth the changes. WDYT ?

zanieb · 2023-01-15T20:00:52Z

I doubt that uvicorn is dominating the startup time of most Python applications with a 60ms import time but 🤷‍♀️ this isn't too complex of a change. Curious what the maintainers think.

Kludex

Thanks @mgu ! I'll share my review here.

So... If you have to ask if a change is worth it, it means that you are aware that this improvement is subjective, and historically, on the framework, we tend to avoid changes that are not a clear improvement.

But some comments:

The supervisors code is a breaking change, so I'd like to avoid that.
I think having h11.DEFAULT_MAX_INCOMPLETE_EVENT_SIZE exposed as default was intentional for the user to see which value is the default. This can be discussed tho... I think we took the decision on the PR that introduced it.
What's the current exception when you don't have pyyaml installed? Now it becomes ModuleNotFound, right? I think this one should be fine. 👍

Kludex · 2023-01-15T22:03:31Z

uvicorn/main.py

@@ -344,7 +342,7 @@ def print_version(ctx: click.Context, param: click.Parameter, value: bool) -> No
    "--h11-max-incomplete-event-size",
    "h11_max_incomplete_event_size",
    type=int,
-    default=DEFAULT_MAX_INCOMPLETE_EVENT_SIZE,
+    default=None,


If I don't recall this wrong, I believe that when this was implemented None was the default, but it was changed to the default value that we currently have. I can be wrong tho...

The value was None before this PR. IMO exposing the default value was just a side effect of fixing the breaking change in h11.

mgu · 2023-01-15T22:54:14Z

So... If you have to ask if a change is worth it, it means that you are aware that this improvement is subjective, and historically, on the framework, we tend to avoid changes that are not a clear improvement.

There's indeed a trade-off between simplicity and performance in the change of supervisors code, and I don't have a clear benchmark of the improvement in real conditions (impact on the startup time of an app in a cloud environment for example).

I'll remove the change on supervisors code from this PR
(With only the changes on h11 & yaml, the import time is now ~49ms)

3. What's the current exception when you don't have pyyaml installed? Now it becomes ModuleNotFound, right? I think this one should be fine.

ModuleNotFound 👍

Kludex · 2023-01-16T06:57:44Z

How did you measure the improvement?

mgu · 2023-01-16T07:56:12Z

How did you measure the improvement?

import time

start = time.time()
import uvicorn.main
end = time.time()
print(end - start)

I run this in a shell loop.
It's quite naive, my apps may also use the same libraries as uvicorn (asyncio for example) but not all (h11, yaml, anyio, ...)

I'm also using tuna to show how long each import takes.

(master) PYTHONPROFILEIMPORTTIME=1 python3.11 -c "import uvicorn"

import time: self [us] | cumulative | imported package
import time:       144 |        144 |   _io
import time:        26 |         26 |   marshal
import time:       365 |        365 |   posix
import time:       292 |        825 | _frozen_importlib_external
import time:       687 |        687 |   time
import time:       176 |        862 | zipimport
import time:        45 |         45 |     _codecs
import time:       288 |        333 |   codecs
import time:       490 |        490 |   encodings.aliases
import time:       749 |       1571 | encodings
import time:       195 |        195 | encodings.utf_8
import time:        63 |         63 | _signal
import time:        26 |         26 |     _abc
import time:        98 |        124 |   abc
import time:       129 |        253 | io
import time:        32 |         32 |       _stat
import time:        44 |         76 |     stat
import time:       642 |        642 |     _collections_abc
import time:        25 |         25 |       genericpath
import time:        41 |         66 |     posixpath
import time:       255 |       1037 |   os
import time:       172 |        172 |   _sitebuiltins
import time:      1147 |       1147 |   _distutils_hack
import time:       462 |        462 |   types
import time:       264 |        264 |       warnings
import time:       161 |        425 |     importlib
import time:       228 |        228 |     importlib._abc
import time:        86 |         86 |         itertools
import time:       117 |        117 |         keyword
import time:        57 |         57 |           _operator
import time:       273 |        330 |         operator
import time:       155 |        155 |         reprlib
import time:        44 |         44 |         _collections
import time:       832 |       1561 |       collections
import time:        39 |         39 |         _functools
import time:       449 |        487 |       functools
import time:       566 |       2613 |     contextlib
import time:       108 |       3372 |   importlib.util
import time:        38 |         38 |   importlib.machinery
import time:      1655 |       1655 |       enum
import time:        51 |         51 |         _sre
import time:       193 |        193 |           re._constants
import time:       260 |        453 |         re._parser
import time:        97 |         97 |         re._casefix
import time:       287 |        887 |       re._compiler
import time:       158 |        158 |       copyreg
import time:       430 |       3129 |     re
import time:       726 |       3855 |   sitecustomize
import time:     11656 |      21736 | site
import time:       118 |        118 |         collections.abc
import time:       104 |        104 |           concurrent
import time:       134 |        134 |                     token
import time:       602 |        736 |                   tokenize
import time:       162 |        898 |                 linecache
import time:       626 |        626 |                 textwrap
import time:       391 |       1914 |               traceback
import time:       202 |        202 |                 _weakrefset
import time:       510 |        711 |               weakref
import time:        23 |         23 |                 _string
import time:       399 |        421 |               string
import time:       469 |        469 |               threading
import time:        25 |         25 |               atexit
import time:      1124 |       4661 |             logging
import time:       412 |       5073 |           concurrent.futures._base
import time:       123 |       5299 |         concurrent.futures
import time:       360 |        360 |           _heapq
import time:       178 |        538 |         heapq
import time:       602 |        602 |           _socket
import time:       411 |        411 |             math
import time:       334 |        334 |             select
import time:       351 |       1095 |           selectors
import time:        35 |         35 |           errno
import time:       312 |        312 |           array
import time:       838 |       2879 |         socket
import time:        36 |         36 |             _locale
import time:       521 |        556 |           locale
import time:       359 |        359 |           signal
import time:       275 |        275 |           fcntl
import time:        68 |         68 |           msvcrt
import time:       314 |        314 |           _posixsubprocess
import time:       384 |       1954 |         subprocess
import time:      1743 |       1743 |           _ssl
import time:       307 |        307 |               _struct
import time:       103 |        410 |             struct
import time:       280 |        280 |             binascii
import time:       184 |        873 |           base64
import time:      1350 |       3964 |         ssl
import time:       168 |        168 |         asyncio.constants
import time:       728 |        728 |               _ast
import time:       636 |       1363 |             ast
import time:       275 |        275 |                 _opcode
import time:       235 |        509 |               opcode
import time:       491 |        999 |             dis
import time:      1262 |       3624 |           inspect
import time:        91 |       3714 |         asyncio.coroutines
import time:       281 |        281 |             _contextvars
import time:       128 |        409 |           contextvars
import time:       123 |        123 |           asyncio.format_helpers
import time:        91 |         91 |             asyncio.base_futures
import time:       124 |        124 |             asyncio.exceptions
import time:        79 |         79 |             asyncio.base_tasks
import time:       406 |        699 |           _asyncio
import time:       356 |       1585 |         asyncio.events
import time:       133 |        133 |         asyncio.futures
import time:       161 |        161 |         asyncio.protocols
import time:       161 |        161 |           asyncio.transports
import time:        72 |         72 |           asyncio.log
import time:       355 |        586 |         asyncio.sslproto
import time:       260 |        260 |             _typing
import time:      1309 |       1569 |           typing
import time:       127 |        127 |             asyncio.mixins
import time:       191 |        191 |             asyncio.tasks
import time:       278 |        594 |           asyncio.locks
import time:       167 |       2329 |         asyncio.staggered
import time:        89 |         89 |         asyncio.trsock
import time:       464 |      23975 |       asyncio.base_events
import time:       163 |        163 |       asyncio.runners
import time:       134 |        134 |       asyncio.queues
import time:       228 |        228 |       asyncio.streams
import time:       114 |        114 |       asyncio.subprocess
import time:        84 |         84 |       asyncio.taskgroups
import time:       202 |        202 |       asyncio.timeouts
import time:        67 |         67 |       asyncio.threads
import time:       176 |        176 |         asyncio.base_subprocess
import time:       237 |        237 |         asyncio.selector_events
import time:       335 |        747 |       asyncio.unix_events
import time:       180 |      25889 |     asyncio
import time:       331 |        331 |           _json
import time:       212 |        543 |         json.scanner
import time:       241 |        783 |       json.decoder
import time:       202 |        202 |       json.encoder
import time:       141 |       1125 |     json
import time:       295 |        295 |           _compat_pickle
import time:       477 |        477 |           _pickle
import time:        69 |         69 |               org
import time:         8 |         77 |             org.python
import time:         7 |         84 |           org.python.core
import time:      1172 |       2027 |         pickle
import time:       424 |        424 |           _queue
import time:       293 |        716 |         queue
import time:        72 |         72 |               org
import time:         7 |         79 |             org.python
import time:         7 |         86 |           org.python.core
import time:       208 |        293 |         copy
import time:       359 |       3393 |       logging.handlers
import time:       370 |        370 |       socketserver
import time:       650 |       4412 |     logging.config
import time:       105 |        105 |       fnmatch
import time:        60 |         60 |         _winapi
import time:        56 |         56 |         nt
import time:        48 |         48 |         nt
import time:        47 |         47 |         nt
import time:        46 |         46 |         nt
import time:        45 |         45 |         nt
import time:        48 |        347 |       ntpath
import time:        86 |         86 |         urllib
import time:       622 |        707 |       urllib.parse
import time:       484 |       1642 |     pathlib
import time:       379 |        379 |             dataclasses
import time:        75 |         75 |             h11._abnf
import time:       193 |        193 |               h11._util
import time:       363 |        555 |             h11._headers
import time:      1655 |       2663 |           h11._events
import time:       142 |        142 |             h11._receivebuffer
import time:       261 |        261 |             h11._state
import time:       546 |        948 |           h11._readers
import time:       206 |        206 |           h11._writers
import time:       365 |       4181 |         h11._connection
import time:        66 |         66 |         h11._version
import time:       129 |       4375 |       h11
import time:         7 |       4381 |     h11._connection
import time:       456 |        456 |       http
import time:       375 |        375 |           gettext
import time:       488 |        488 |               _datetime
import time:       470 |        958 |             datetime
import time:       339 |        339 |             click._compat
import time:        88 |         88 |                 click.globals
import time:       253 |        340 |               click.utils
import time:       237 |        576 |             click.exceptions
import time:       382 |       2253 |           click.types
import time:       199 |        199 |             click.parser
import time:       204 |        402 |           click.formatting
import time:       286 |        286 |           click.termui
import time:      1524 |       4839 |         click.core
import time:       186 |        186 |         click.decorators
import time:       168 |       5192 |       click
import time:       139 |       5787 |     uvicorn.logging
import time:       139 |        139 |       yaml.error
import time:       158 |        158 |       yaml.tokens
import time:       165 |        165 |       yaml.events
import time:        80 |         80 |       yaml.nodes
import time:      2958 |       2958 |         yaml.reader
import time:       222 |        222 |         yaml.scanner
import time:       212 |        212 |         yaml.parser
import time:        86 |         86 |         yaml.composer
import time:       459 |        459 |         yaml.constructor
import time:       754 |        754 |         yaml.resolver
import time:       175 |       4863 |       yaml.loader
import time:       155 |        155 |         yaml.emitter
import time:        83 |         83 |         yaml.serializer
import time:       152 |        152 |         yaml.representer
import time:       120 |        509 |       yaml.dumper
import time:        18 |         18 |           yaml.yaml
import time:       435 |        453 |         yaml._yaml
import time:       169 |        621 |       yaml.cyaml
import time:       203 |       6735 |     yaml
import time:        78 |         78 |     uvicorn.importer
import time:        60 |         60 |       uvicorn.middleware
import time:       114 |        173 |     uvicorn.middleware.asgi2
import time:        76 |         76 |     uvicorn.middleware.message_logger
import time:       137 |        137 |     uvicorn.middleware.proxy_headers
import time:       121 |        121 |       uvicorn._types
import time:       136 |        136 |       concurrent.futures.thread
import time:       111 |        366 |     uvicorn.middleware.wsgi
import time:       529 |      51325 |   uvicorn.config
import time:       866 |        866 |     platform
import time:       106 |        106 |         email
import time:       305 |        305 |             _bisect
import time:        83 |        388 |           bisect
import time:       296 |        296 |           _random
import time:       273 |        273 |           _sha512
import time:       240 |       1196 |         random
import time:       330 |        330 |           calendar
import time:       128 |        458 |         email._parseaddr
import time:        71 |         71 |           email.base64mime
import time:       119 |        119 |           email.quoprimime
import time:       240 |        240 |           email.errors
import time:       104 |        104 |             quopri
import time:        67 |        170 |           email.encoders
import time:       111 |        708 |         email.charset
import time:       285 |       2751 |       email.utils
import time:       177 |       2927 |     uvicorn.server
import time:       187 |        187 |               multiprocessing.process
import time:       152 |        152 |               multiprocessing.reduction
import time:       354 |        693 |             multiprocessing.context
import time:       147 |        840 |           multiprocessing
import time:       349 |        349 |                 zlib
import time:       168 |        168 |                   _compression
import time:       280 |        280 |                   _bz2
import time:       139 |        586 |                 bz2
import time:       477 |        477 |                   _lzma
import time:       131 |        607 |                 lzma
import time:       326 |       1867 |               shutil
import time:       226 |       2092 |             tempfile
import time:       330 |        330 |             _multiprocessing
import time:       152 |        152 |             multiprocessing.util
import time:        61 |         61 |             _winapi
import time:       304 |       2937 |           multiprocessing.connection
import time:       148 |       3924 |         uvicorn._subprocess
import time:       194 |       4117 |       uvicorn.supervisors.basereload
import time:        92 |         92 |       uvicorn.supervisors.multiprocess
import time:       178 |        178 |           watchfiles.filters
import time:        88 |         88 |                 anyio._core
import time:       366 |        453 |               anyio._core._compat
import time:        79 |         79 |                   sniffio._version
import time:        78 |         78 |                   sniffio._impl
import time:       112 |        269 |                 sniffio
import time:       107 |        375 |               anyio._core._eventloop
import time:       192 |        192 |               anyio._core._exceptions
import time:        94 |         94 |                     anyio.abc._resources
import time:       603 |        603 |                       ipaddress
import time:       123 |        123 |                       anyio._core._typedattr
import time:       106 |        106 |                         anyio.abc._tasks
import time:       806 |        912 |                       anyio.abc._streams
import time:       276 |       1912 |                     anyio.abc._sockets
import time:        97 |         97 |                     anyio.abc._subprocesses
import time:       109 |        109 |                     anyio.abc._testing
import time:       600 |        600 |                       anyio.lowlevel
import time:       143 |        143 |                       anyio._core._tasks
import time:       107 |        107 |                       anyio._core._testing
import time:      1335 |       2183 |                     anyio._core._synchronization
import time:       249 |        249 |                     anyio.from_thread
import time:       115 |       4755 |                   anyio.abc
import time:        74 |       4829 |                 anyio.to_thread
import time:       476 |       5304 |               anyio._core._fileio
import time:        67 |         67 |               anyio._core._resources
import time:        72 |         72 |               anyio._core._signals
import time:        55 |         55 |                   anyio.streams
import time:       504 |        559 |                 anyio.streams.stapled
import time:       466 |        466 |                 anyio.streams.tls
import time:       223 |       1247 |               anyio._core._sockets
import time:       673 |        673 |                 anyio.streams.memory
import time:       124 |        797 |               anyio._core._streams
import time:       139 |        139 |               anyio._core._subprocesses
import time:       185 |       8828 |             anyio
import time:       803 |        803 |             watchfiles._rust_notify
import time:       434 |      10064 |           watchfiles.main
import time:       198 |        198 |             shlex
import time:       399 |        597 |           watchfiles.run
import time:        69 |         69 |           watchfiles.version
import time:       118 |      11024 |         watchfiles
import time:       100 |      11124 |       uvicorn.supervisors.watchfilesreload
import time:       103 |      15435 |     uvicorn.supervisors
import time:       540 |      19767 |   uvicorn.main
import time:       270 |      71362 | uvicorn

(4ef9150) PYTHONPROFILEIMPORTTIME=1 python3.11 -c "import uvicorn"

import time: self [us] | cumulative | imported package
import time:       129 |        129 |   _io
import time:        52 |         52 |   marshal
import time:       364 |        364 |   posix
import time:       307 |        851 | _frozen_importlib_external
import time:      1042 |       1042 |   time
import time:        96 |       1137 | zipimport
import time:        38 |         38 |     _codecs
import time:       281 |        318 |   codecs
import time:       466 |        466 |   encodings.aliases
import time:       661 |       1445 | encodings
import time:       191 |        191 | encodings.utf_8
import time:        62 |         62 | _signal
import time:        26 |         26 |     _abc
import time:        95 |        120 |   abc
import time:       130 |        249 | io
import time:        31 |         31 |       _stat
import time:        93 |        123 |     stat
import time:       659 |        659 |     _collections_abc
import time:        23 |         23 |       genericpath
import time:        42 |         64 |     posixpath
import time:       258 |       1103 |   os
import time:        48 |         48 |   _sitebuiltins
import time:      1104 |       1104 |   _distutils_hack
import time:       385 |        385 |   types
import time:       234 |        234 |       warnings
import time:       162 |        395 |     importlib
import time:       219 |        219 |     importlib._abc
import time:        72 |         72 |         itertools
import time:       117 |        117 |         keyword
import time:        50 |         50 |           _operator
import time:       255 |        304 |         operator
import time:       148 |        148 |         reprlib
import time:        40 |         40 |         _collections
import time:       822 |       1501 |       collections
import time:        45 |         45 |         _functools
import time:       425 |        470 |       functools
import time:       515 |       2484 |     contextlib
import time:        89 |       3186 |   importlib.util
import time:        38 |         38 |   importlib.machinery
import time:      1795 |       1795 |       enum
import time:        46 |         46 |         _sre
import time:       196 |        196 |           re._constants
import time:       262 |        458 |         re._parser
import time:        89 |         89 |         re._casefix
import time:       315 |        906 |       re._compiler
import time:       128 |        128 |       copyreg
import time:       476 |       3305 |     re
import time:       748 |       4053 |   sitecustomize
import time:     11050 |      20962 | site
import time:       115 |        115 |         collections.abc
import time:       104 |        104 |           concurrent
import time:       143 |        143 |                     token
import time:       608 |        751 |                   tokenize
import time:       173 |        924 |                 linecache
import time:       594 |        594 |                 textwrap
import time:       352 |       1868 |               traceback
import time:       159 |        159 |                 _weakrefset
import time:       433 |        591 |               weakref
import time:        27 |         27 |                 _string
import time:       494 |        520 |               string
import time:       522 |        522 |               threading
import time:        26 |         26 |               atexit
import time:      1121 |       4646 |             logging
import time:       437 |       5082 |           concurrent.futures._base
import time:       121 |       5306 |         concurrent.futures
import time:       371 |        371 |           _heapq
import time:       231 |        602 |         heapq
import time:       650 |        650 |           _socket
import time:       387 |        387 |             math
import time:       317 |        317 |             select
import time:       363 |       1066 |           selectors
import time:        30 |         30 |           errno
import time:       309 |        309 |           array
import time:       864 |       2917 |         socket
import time:        47 |         47 |             _locale
import time:       608 |        655 |           locale
import time:       432 |        432 |           signal
import time:       403 |        403 |           fcntl
import time:        77 |         77 |           msvcrt
import time:       382 |        382 |           _posixsubprocess
import time:       389 |       2336 |         subprocess
import time:      1724 |       1724 |           _ssl
import time:       320 |        320 |               _struct
import time:       109 |        428 |             struct
import time:       383 |        383 |             binascii
import time:       213 |       1024 |           base64
import time:      1430 |       4176 |         ssl
import time:       170 |        170 |         asyncio.constants
import time:       654 |        654 |               _ast
import time:       665 |       1319 |             ast
import time:       286 |        286 |                 _opcode
import time:       253 |        538 |               opcode
import time:       536 |       1073 |             dis
import time:      1398 |       3789 |           inspect
import time:        98 |       3886 |         asyncio.coroutines
import time:       298 |        298 |             _contextvars
import time:       138 |        436 |           contextvars
import time:       109 |        109 |           asyncio.format_helpers
import time:       115 |        115 |             asyncio.base_futures
import time:       138 |        138 |             asyncio.exceptions
import time:        85 |         85 |             asyncio.base_tasks
import time:       380 |        715 |           _asyncio
import time:       326 |       1585 |         asyncio.events
import time:       132 |        132 |         asyncio.futures
import time:       148 |        148 |         asyncio.protocols
import time:       153 |        153 |           asyncio.transports
import time:        70 |         70 |           asyncio.log
import time:       331 |        552 |         asyncio.sslproto
import time:       268 |        268 |             _typing
import time:      1361 |       1628 |           typing
import time:       134 |        134 |             asyncio.mixins
import time:       199 |        199 |             asyncio.tasks
import time:       281 |        613 |           asyncio.locks
import time:       169 |       2409 |         asyncio.staggered
import time:        89 |         89 |         asyncio.trsock
import time:       496 |      24914 |       asyncio.base_events
import time:       160 |        160 |       asyncio.runners
import time:       137 |        137 |       asyncio.queues
import time:       225 |        225 |       asyncio.streams
import time:       118 |        118 |       asyncio.subprocess
import time:        83 |         83 |       asyncio.taskgroups
import time:       203 |        203 |       asyncio.timeouts
import time:        65 |         65 |       asyncio.threads
import time:       178 |        178 |         asyncio.base_subprocess
import time:       249 |        249 |         asyncio.selector_events
import time:       338 |        763 |       asyncio.unix_events
import time:       188 |      26853 |     asyncio
import time:       339 |        339 |           _json
import time:       212 |        551 |         json.scanner
import time:       241 |        791 |       json.decoder
import time:       217 |        217 |       json.encoder
import time:       134 |       1141 |     json
import time:       206 |        206 |           _compat_pickle
import time:       423 |        423 |           _pickle
import time:       104 |        104 |               org
import time:        10 |        114 |             org.python
import time:         7 |        120 |           org.python.core
import time:       904 |       1652 |         pickle
import time:       402 |        402 |           _queue
import time:       323 |        724 |         queue
import time:        76 |         76 |               org
import time:         9 |         85 |             org.python
import time:         7 |         91 |           org.python.core
import time:       156 |        247 |         copy
import time:       381 |       3003 |       logging.handlers
import time:       377 |        377 |       socketserver
import time:       638 |       4017 |     logging.config
import time:       106 |        106 |       fnmatch
import time:        63 |         63 |         _winapi
import time:        58 |         58 |         nt
import time:        54 |         54 |         nt
import time:        58 |         58 |         nt
import time:        54 |         54 |         nt
import time:        51 |         51 |         nt
import time:        54 |        390 |       ntpath
import time:        95 |         95 |         urllib
import time:       597 |        692 |       urllib.parse
import time:       482 |       1669 |     pathlib
import time:       396 |        396 |       http
import time:       448 |        448 |           gettext
import time:       431 |        431 |               _datetime
import time:       463 |        894 |             datetime
import time:       458 |        458 |             click._compat
import time:        91 |         91 |                 click.globals
import time:       218 |        309 |               click.utils
import time:       241 |        549 |             click.exceptions
import time:       396 |       2295 |           click.types
import time:       205 |        205 |             click.parser
import time:       226 |        430 |           click.formatting
import time:       298 |        298 |           click.termui
import time:      1241 |       4710 |         click.core
import time:       188 |        188 |         click.decorators
import time:       233 |       5130 |       click
import time:       158 |       5684 |     uvicorn.logging
import time:        73 |         73 |     uvicorn.importer
import time:        67 |         67 |       uvicorn.middleware
import time:       319 |        386 |     uvicorn.middleware.asgi2
import time:       101 |        101 |     uvicorn.middleware.message_logger
import time:       130 |        130 |     uvicorn.middleware.proxy_headers
import time:       130 |        130 |       uvicorn._types
import time:       142 |        142 |       concurrent.futures.thread
import time:       127 |        399 |     uvicorn.middleware.wsgi
import time:       745 |      41192 |   uvicorn.config
import time:      1003 |       1003 |     platform
import time:        99 |         99 |         email
import time:       317 |        317 |             _bisect
import time:        99 |        416 |           bisect
import time:       281 |        281 |           _random
import time:       260 |        260 |           _sha512
import time:       304 |       1260 |         random
import time:       280 |        280 |           calendar
import time:       135 |        414 |         email._parseaddr
import time:        63 |         63 |           email.base64mime
import time:       648 |        648 |           email.quoprimime
import time:       271 |        271 |           email.errors
import time:       105 |        105 |             quopri
import time:        77 |        182 |           email.encoders
import time:       116 |       1277 |         email.charset
import time:       293 |       3342 |       email.utils
import time:       181 |       3522 |     uvicorn.server
import time:       940 |       5464 |   uvicorn.main
import time:       256 |      46912 | uvicorn

mgu · 2023-01-20T14:54:31Z

@Kludex did you have time to take a look at the changes and the way I tested it ?
(I'm still convinced the change on the reloader classes was useful 😄 )

Kludex · 2023-02-06T20:40:20Z

What's the improvement with only the yaml package?

I like the default on DEFAULT_MAX_INCOMPLETE_EVENT_SIZE... 👀

mgu · 2023-02-06T22:18:25Z

with only the yaml package, the result is ~65ms -> ~59ms
note: the default value for --h11-max-incomplete-event-size is not shown in
uvicorn --help

Kludex · 2023-02-07T02:23:17Z

Ah... It's not?

Then I can accept it more easily 🧐

Let me see this in a few hours when I wake up.

Kludex · 2023-02-07T10:00:23Z

Thanks 👍

lazy load yaml library

e35b34f

mgu force-pushed the improve-import-time branch 3 times, most recently from 06c3738 to 4ef9150 Compare January 14, 2023 21:57

Kludex reviewed Jan 15, 2023

View reviewed changes

Do not load h11 if it's not used

ab0a67c

mgu force-pushed the improve-import-time branch from 4ef9150 to ab0a67c Compare January 15, 2023 22:57

Kludex approved these changes Feb 7, 2023

View reviewed changes

Kludex merged commit 82367be into encode:master Feb 7, 2023

mgu deleted the improve-import-time branch February 7, 2023 10:08

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Improve import time #1846

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