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Queue write only after processing all buffers #445

Merged
merged 6 commits into from
Sep 9, 2022
Merged

Queue write only after processing all buffers #445

merged 6 commits into from
Sep 9, 2022

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jakirkham
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Partially addresses ( #404 )

Delays calling _queue_write until writelines has added all buffers with _write. Should allow libuv to leveraged vectorized IO (scatter) via calling sendmsg under-the-hood.

@jakirkham
Queue write only after processing all buffers
c8fc56d 
Allows `writelines` to leverage vectorized IO within uvloop to send
multiple buffers in one `sendmsg` call.
@jakirkham
Add copyright header
a12214a
jakirkham
jakirkham commented Oct 1, 2021
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uvloop/handles/stream.pyx Outdated Show resolved Hide resolved
@jakirkham jakirkham mentioned this pull request Oct 1, 2021
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Also given GitHub's new policy regarding running CI. Think someone needs to approve running CI here for that to happen

@jakirkham jakirkham requested a review from 1st1 October 5, 2021 18:40
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@1st1 any thoughts here?

Also need some help running the tests. GH doesn't run tests for new contributors on any commit without approval by default

@jakirkham jakirkham mentioned this pull request Oct 21, 2021
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@fantix, do you have any thoughts on this one? 🙂

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Friendly nudge 😉

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fantix commented Aug 13, 2022

Thanks for the PR and sorry for the long waiting!

Should allow libuv to leveraged vectorized IO (scatter) via calling sendmsg under-the-hood.

Hmm do you have some test results to show if gathered send is/not working before/after this change? I'm asking because I think _queue_write() doesn't call _exec_write() until the next loop iteration, so calling _queue_write() multiple times in a tight loop in writelines() is equivalent to calling it just once. I'll run a test later when I come back to this one.

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1st1 approved these changes Aug 23, 2022
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@fantix looks good. Please check that we call _queue_write whenever we call _write, but overall this is good.

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1st1 commented Aug 23, 2022

Hmm do you have some test results to show if gathered send is/not working before/after this change? I'm asking because I think _queue_write() doesn't call _exec_write() until the next loop iteration, so calling _queue_write() multiple times in a tight loop in writelines()

Yeah, this has to be benchmarked, ideally, but the change still looks good & logical. I think we should go with it.

Perhaps we should reshape it a little -- add a default arg "queue_write=True" to _write and call it with "False" from writelines() (to make this internal API a bit easier to use)

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Thanks all! 🙏

Yeah agree benchmarking makes sense. Is there a preferred set of benchmarks here we should try with initially? Also is there somewhere to add new benchmarks?

As to context about this change, did a fair bit of sleuthing in issue ( #404 ), which included a bit of digging into libuv itself. Could always be missing something. So would certainly appreciate feedback on that.

Sure happy to tweak the API to make things a bit more flexible.

@fantix fantix requested a review from 1st1 September 9, 2022 17:47
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@fantix fantix merged commit 9c6ecb6 into MagicStack:master Sep 9, 2022
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fantix commented Sep 9, 2022

@jakirkham thank you for starting this anyways! Please feel free to comment on the PR or the original issue.

fantix added a commit that referenced this pull request Sep 9, 2022
@fantix
CRF: rename _start_write() to _initiate_write()
cdab9d3 
Tweaked the comments too.

Refs #445
fantix added a commit that referenced this pull request Sep 13, 2022
@fantix
uvloop v0.17.0
c4c3f9f 
This release adds Python 3.11 support, updates bundled libuv to 1.43.0
and fixes a handful of issues.

Changes
=======

* Expose uv_loop_t pointer for integration with other C-extensions (#310)
  (by @pranavtbhat in b332eb8 for #310)

* Support python 3.11+ (#473)
  (by @zeroday0619 in 8e42921 for #473)

* Expose libuv uv_fs_event functionality (#474)
  (by @jensbjorgensen @fantix in 74d381e for #474)

* Activate debug mode when `-X dev` is used
  (by @jack1142 in 637a77a)

* Expose uv_version() for libuv API compatibility (#491)
  (by @fantix in 089f6cb for #491)

* Fix loop.getaddrinfo() and tests (#495)
  (by @fantix in 598b16f for #495)

* Bump to libuv 1.43.0
  (by @fantix in 94e5e53)

Fixes
=====

* _TransProtPair is no longer defined in asyncio.events
  (by @jensbjorgensen in fae5f7f)

* use a TypeVar for asyncio.BaseProtocol (#478)
  (by @graingert in 3aacb35 for #478)

* Fix segfault in TimerHandle.when() after cleared
  (by @jensbjorgensen in c39afff for #469)

* Avoid self._errpipe_write double close (#466)
  (by @graingert in 72140d7 for #466)

* Fix typo in test (#456)
  (by @kianmeng in 033d52d for #456)

* Fix potential infinite loop (#446)
  (by @kfur in ada43c0 for #446)

* use a stack of self._fds_to_close to prevent double closes (#481)
  (by @graingert in 3214cf6 for #481)

* Fix incorrect main thread id value forking from a thread  (#453)
  (by @horpto @fantix in e7934c8 for #453)

* create_subprocess_exec should treat env={} as empty environment (#439) (#454)
  (by @byllyfish in e04637e for #439)

* Queue write only after processing all buffers (#445)
  (by @jakirkham @fantix in 9c6ecb6 for #445)

* Drop Python 3.6 support for thread ident
  (by @fantix in 9c37930)

* bugfix: write to another transport in resume_writing() fails (#498)
  (by @fantix in d2deffe for #498)

Build
=====

* Upgrade GitHub Actions (#477) (#480)
  (by @cclauss in fcbf422 for #477, 1008694 for #480)

* typo `same as same`
  (by @YoSTEALTH in fedba80)

* setup.py: allow to override extra_compile_args (#443)
  (by @giuliobenetti in a130375 for #443)

* Drop hack in setup.py in finalize_options (492)
  (by @fantix in 2f1bc83 for #492)

* Fix tests invocation on release CI worklow (#489)
  (by @ben9923 in d6a2b59 for #489)

Documentation
=============

* use asyncio.Runner loop_factory on 3.11+ (#472)
  (by @graingert in 31ba48c for #472)

* Fix CI badge in docs, remove remaining Travis CI references from docs
  (by @Nothing4You in c6901a7)

* Fix typo in README
  (by @monosans in 73d7253)
@fantix fantix mentioned this pull request Sep 13, 2022
Merged
fantix added a commit that referenced this pull request Sep 14, 2022
@fantix
uvloop v0.17.0
afb3268 
This release adds Python 3.11 support, updates bundled libuv to 1.43.0
and fixes a handful of issues.

Changes
=======

* Expose uv_loop_t pointer for integration with other C-extensions (#310)
  (by @pranavtbhat in b332eb8 for #310)

* Support python 3.11+ (#473)
  (by @zeroday0619 in 8e42921 for #473)

* Expose libuv uv_fs_event functionality (#474)
  (by @jensbjorgensen @fantix in 74d381e for #474)

* Activate debug mode when `-X dev` is used
  (by @jack1142 in 637a77a)

* Expose uv_version() for libuv API compatibility (#491)
  (by @fantix in 089f6cb for #491)

* Fix loop.getaddrinfo() and tests (#495)
  (by @fantix in 598b16f for #495)

* Bump to libuv 1.43.0
  (by @fantix in 94e5e53)

Fixes
=====

* _TransProtPair is no longer defined in asyncio.events
  (by @jensbjorgensen in fae5f7f)

* use a TypeVar for asyncio.BaseProtocol (#478)
  (by @graingert in 3aacb35 for #478)

* Fix segfault in TimerHandle.when() after cleared
  (by @jensbjorgensen in c39afff for #469)

* Avoid self._errpipe_write double close (#466)
  (by @graingert in 72140d7 for #466)

* Fix typo in test (#456)
  (by @kianmeng in 033d52d for #456)

* Fix potential infinite loop (#446)
  (by @kfur in ada43c0 for #446)

* use a stack of self._fds_to_close to prevent double closes (#481)
  (by @graingert in 3214cf6 for #481)

* Fix incorrect main thread id value forking from a thread  (#453)
  (by @horpto @fantix in e7934c8 for #453)

* create_subprocess_exec should treat env={} as empty environment (#439) (#454)
  (by @byllyfish in e04637e for #439)

* Queue write only after processing all buffers (#445)
  (by @jakirkham @fantix in 9c6ecb6 for #445)

* Drop Python 3.6 support for thread ident
  (by @fantix in 9c37930)

* bugfix: write to another transport in resume_writing() fails (#498)
  (by @fantix in d2deffe for #498)

Build
=====

* Upgrade GitHub Actions (#477) (#480)
  (by @cclauss in fcbf422 for #477, 1008694 for #480)

* typo `same as same`
  (by @YoSTEALTH in fedba80)

* setup.py: allow to override extra_compile_args (#443)
  (by @giuliobenetti in a130375 for #443)

* Drop hack in setup.py in finalize_options (492)
  (by @fantix in 2f1bc83 for #492)

* Fix tests invocation on release CI worklow (#489)
  (by @ben9923 in d6a2b59 for #489)

Documentation
=============

* use asyncio.Runner loop_factory on 3.11+ (#472)
  (by @graingert in 31ba48c for #472)

* Fix CI badge in docs, remove remaining Travis CI references from docs
  (by @Nothing4You in c6901a7)

* Fix typo in README
  (by @monosans in 73d7253)
@jakirkham
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Thanks all for improving this and including it 🙏

Sorry for being unresponsive (was out at the time). Though am happy to see this conclusion while catching up 🙂

@jakirkham jakirkham deleted the queue_write_once branch September 26, 2022 08:53
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