Implement work-stealing scheduler #858

amezin · 2022-12-20T20:51:43Z

The more I look at the scheduling problem, the more I think it should be solved using work stealing https://en.wikipedia.org/wiki/Work_stealing :

Initially, all tests are split among the workers evenly.
When some worker completes all of its tests, the scheduler asks the worker with max number of pending tests to give half of its pending tests back.
After receiving the confirmation, the scheduler sends the returned tests to the worker that ran out of tests.
Shutdown workers when no tests can be reallocated ("stolen").

Of course, there are some tricky synchronization details - but nothing impossible to implement. This algorithm shouldn't need any parameters or assumptions about test duration to perform optimally. And the code could even turn out to be simpler than the current LoadScheduling.

By "perform optimally" I mean:

In the ideal case, where all test have the same duration: n tests are split among m workers, each worker runs n/m consecutive tests - and achieves the best reuse of fixtures possible (possible without additional information about the fixtures).
No workers are idle while there are pending tests.

The only issue is that I don't know when I'll have enough free time to write a custom scheduler from scratch.

I plan to work on this myself, but I'm not sure when I'll have time for it.

Also, I would appreciate feedback on the idea from the maintainers.

The text was updated successfully, but these errors were encountered:

amezin · 2022-12-20T21:02:49Z

This should solve:

New LoadScheduling batch distribution logic doesn't work for long-running tests #855 but with no additional parameter
Feature request: worker pool with --dist=pool #794 but work stealing needs less communication than "request every test one by one"
Make load scheduler configurable #255
probably more

nicoddemus · 2022-12-21T11:37:39Z

Hi @amezin, the idea definitely sounds interesting! Would love to review/merge a patch with this.

Closes pytest-dev#858

Closes #858

alex · 2023-02-07T15:25:39Z

Does it make sense for this to be on by default with -nauto, or are there trade-offs that make load better?

amezin · 2023-02-07T15:31:40Z

Compared to load it's not battle-tested at all.

I belive at some point worksteal should become the default and load should be deprecated.

But not in the first release.

alex · 2023-02-07T15:34:57Z

Got it, thanks!

…

On Tue, Feb 7, 2023 at 10:31 AM Aleksandr Mezin ***@***.***> wrote: Compared to load it's not battle-tested at all. I belive at some point worksteal should become the default and load should be deprecated. But not in the first release. — Reply to this email directly, view it on GitHub <#858 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAAGBCS4R2RFXDC4TB5ECDWWJTGRANCNFSM6AAAAAATE5FSZQ> . You are receiving this because you commented.Message ID: ***@***.***>

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It's similar to <code>load</code> scheduler, but it should handle tests with significantly differing duration better, and, at the same time, it should provide similar or better reuse of fixtures.</p> </li> </ul> <h2>Trivial Changes</h2> <ul> <li><code>[#870](pytest-dev/pytest-xdist#870) <https://github.com/pytest-dev/pytest-xdist/issues/870></code>_: Make the tests pass even when <code>$PYTEST_XDIST_AUTO_NUM_WORKERS</code> is set.</li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/5c065198e98df484d8193a5fba5480db541fac37"><code>5c06519</code></a> Release 3.2.0</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/c695763e92951e20bd10c783c47884032826ea6d"><code>c695763</code></a> [pre-commit.ci] pre-commit autoupdate (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/869">#869</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/9373ddb3f841a009bc9669b514923b6ecba724e7"><code>9373ddb</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/870">#870</a> from hroncok/delenv</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/8fd1bfd182e87f46e2c2ff6dbb43c0cd43d0cc00"><code>8fd1bfd</code></a> Tests: Unset PYTEST_XDIST_AUTO_NUM_WORKERS when the behavior without the envv...</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/017cc72b7090dc4bb7e7ad3d0caab024feb977a8"><code>017cc72</code></a> Document limitations for debugging as well as a workaround (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/867">#867</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/cf19f76d86aa149d21242da520879b8e0ee80013"><code>cf19f76</code></a> Fix minor typos in the documentation (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/866">#866</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/691a0751bf7081224287d13c0863fc981a838380"><code>691a075</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/865">#865</a> from amezin/fix-loadsched-tests</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/e9860923bf899b283627526bf9a23cb688204d42"><code>e986092</code></a> Fix some LoadScheduling tests</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/d1dfad3e927e225c967f16928b39eee43a3d6457"><code>d1dfad3</code></a> Implement work-stealing scheduler (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/862">#862</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/9b0b5b1495b024940e3f5c71583711be46df255b"><code>9b0b5b1</code></a> Add --maxschedchunk CLI option (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/857">#857</a>)</li> <li>Additional commits viewable in <a href="https://github.com/pytest-dev/pytest-xdist/compare/v3.1.0...v3.2.0">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=pytest-xdist&package-manager=pip&previous-version=3.1.0&new-version=3.2.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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Also, mention remote debugging as a possible workaround.</li> </ul> <h2>Features</h2> <ul> <li> <p><code>[#855](pytest-dev/pytest-xdist#855) <https://github.com/pytest-dev/pytest-xdist/issues/855></code>_: Users can now configure <code>load</code> scheduling precision using <code>--maxschedchunk</code> command line option.</p> </li> <li> <p><code>[#858](pytest-dev/pytest-xdist#858) <https://github.com/pytest-dev/pytest-xdist/issues/858></code><em>: New <code>worksteal</code> scheduler, based on the idea of <code>work stealing <https://en.wikipedia.org/wiki/Work_stealing></code></em>. It's similar to <code>load</code> scheduler, but it should handle tests with significantly differing duration better, and, at the same time, it should provide similar or better reuse of fixtures.</p> </li> </ul> <h2>Trivial Changes</h2> <ul> <li><code>[#870](pytest-dev/pytest-xdist#870) <https://github.com/pytest-dev/pytest-xdist/issues/870></code>_: Make the tests pass even when <code>$PYTEST_XDIST_AUTO_NUM_WORKERS</code> is set.</li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/5c065198e98df484d8193a5fba5480db541fac37"><code>5c06519</code></a> Release 3.2.0</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/c695763e92951e20bd10c783c47884032826ea6d"><code>c695763</code></a> [pre-commit.ci] pre-commit autoupdate (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/869">#869</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/9373ddb3f841a009bc9669b514923b6ecba724e7"><code>9373ddb</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/870">#870</a> from hroncok/delenv</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/8fd1bfd182e87f46e2c2ff6dbb43c0cd43d0cc00"><code>8fd1bfd</code></a> Tests: Unset PYTEST_XDIST_AUTO_NUM_WORKERS when the behavior without the envv...</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/017cc72b7090dc4bb7e7ad3d0caab024feb977a8"><code>017cc72</code></a> Document limitations for debugging as well as a workaround (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/867">#867</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/cf19f76d86aa149d21242da520879b8e0ee80013"><code>cf19f76</code></a> Fix minor typos in the documentation (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/866">#866</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/691a0751bf7081224287d13c0863fc981a838380"><code>691a075</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/865">#865</a> from amezin/fix-loadsched-tests</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/e9860923bf899b283627526bf9a23cb688204d42"><code>e986092</code></a> Fix some LoadScheduling tests</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/d1dfad3e927e225c967f16928b39eee43a3d6457"><code>d1dfad3</code></a> Implement work-stealing scheduler (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/862">#862</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/9b0b5b1495b024940e3f5c71583711be46df255b"><code>9b0b5b1</code></a> Add --maxschedchunk CLI option (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/857">#857</a>)</li> <li>Additional commits viewable in <a href="https://github.com/pytest-dev/pytest-xdist/compare/v3.1.0...v3.2.0">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=pytest-xdist&package-manager=pip&previous-version=3.1.0&new-version=3.2.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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[//]: # (dependabot-start) ⚠️ **Dependabot is rebasing this PR** ⚠️ Rebasing might not happen immediately, so don't worry if this takes some time. Note: if you make any changes to this PR yourself, they will take precedence over the rebase. --- [//]: # (dependabot-end) Bumps [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) from 3.1.0 to 3.2.0. <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/pytest-dev/pytest-xdist/blob/master/CHANGELOG.rst">pytest-xdist's changelog</a>.</em></p> <blockquote> <h1>pytest-xdist 3.2.0 (2023-02-07)</h1> <h2>Improved Documentation</h2> <ul> <li><code>[#863](pytest-dev/pytest-xdist#863) <https://github.com/pytest-dev/pytest-xdist/issues/863></code>_: Document limitations for debugging due to standard I/O of workers not being forwarded. Also, mention remote debugging as a possible workaround.</li> </ul> <h2>Features</h2> <ul> <li> <p><code>[#855](pytest-dev/pytest-xdist#855) <https://github.com/pytest-dev/pytest-xdist/issues/855></code>_: Users can now configure <code>load</code> scheduling precision using <code>--maxschedchunk</code> command line option.</p> </li> <li> <p><code>[#858](pytest-dev/pytest-xdist#858) <https://github.com/pytest-dev/pytest-xdist/issues/858></code><em>: New <code>worksteal</code> scheduler, based on the idea of <code>work stealing <https://en.wikipedia.org/wiki/Work_stealing></code></em>. It's similar to <code>load</code> scheduler, but it should handle tests with significantly differing duration better, and, at the same time, it should provide similar or better reuse of fixtures.</p> </li> </ul> <h2>Trivial Changes</h2> <ul> <li><code>[#870](pytest-dev/pytest-xdist#870) <https://github.com/pytest-dev/pytest-xdist/issues/870></code>_: Make the tests pass even when <code>$PYTEST_XDIST_AUTO_NUM_WORKERS</code> is set.</li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/5c065198e98df484d8193a5fba5480db541fac37"><code>5c06519</code></a> Release 3.2.0</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/c695763e92951e20bd10c783c47884032826ea6d"><code>c695763</code></a> [pre-commit.ci] pre-commit autoupdate (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/869">#869</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/9373ddb3f841a009bc9669b514923b6ecba724e7"><code>9373ddb</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/870">#870</a> from hroncok/delenv</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/8fd1bfd182e87f46e2c2ff6dbb43c0cd43d0cc00"><code>8fd1bfd</code></a> Tests: Unset PYTEST_XDIST_AUTO_NUM_WORKERS when the behavior without the envv...</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/017cc72b7090dc4bb7e7ad3d0caab024feb977a8"><code>017cc72</code></a> Document limitations for debugging as well as a workaround (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/867">#867</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/cf19f76d86aa149d21242da520879b8e0ee80013"><code>cf19f76</code></a> Fix minor typos in the documentation (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/866">#866</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/691a0751bf7081224287d13c0863fc981a838380"><code>691a075</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/865">#865</a> from amezin/fix-loadsched-tests</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/e9860923bf899b283627526bf9a23cb688204d42"><code>e986092</code></a> Fix some LoadScheduling tests</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/d1dfad3e927e225c967f16928b39eee43a3d6457"><code>d1dfad3</code></a> Implement work-stealing scheduler (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/862">#862</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/9b0b5b1495b024940e3f5c71583711be46df255b"><code>9b0b5b1</code></a> Add --maxschedchunk CLI option (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/857">#857</a>)</li> <li>Additional commits viewable in <a href="https://github.com/pytest-dev/pytest-xdist/compare/v3.1.0...v3.2.0">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=pytest-xdist&package-manager=pip&previous-version=3.1.0&new-version=3.2.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. [//]: # (dependabot-automerge-start) [//]: # (dependabot-automerge-end) --- <details> <summary>Dependabot commands and options</summary> <br /> You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot merge` will merge this PR after your CI passes on it - `@dependabot squash and merge` will squash and merge this PR after your CI passes on it - `@dependabot cancel merge` will cancel a previously requested merge and block automerging - `@dependabot reopen` will reopen this PR if it is closed - `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually - `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself) </details>

Bumps [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) from 3.1.0 to 3.2.0. <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/pytest-dev/pytest-xdist/blob/master/CHANGELOG.rst">pytest-xdist's changelog</a>.</em></p> <blockquote> <h1>pytest-xdist 3.2.0 (2023-02-07)</h1> <h2>Improved Documentation</h2> <ul> <li><code>[#863](pytest-dev/pytest-xdist#863) <https://github.com/pytest-dev/pytest-xdist/issues/863></code>_: Document limitations for debugging due to standard I/O of workers not being forwarded. Also, mention remote debugging as a possible workaround.</li> </ul> <h2>Features</h2> <ul> <li> <p><code>[#855](pytest-dev/pytest-xdist#855) <https://github.com/pytest-dev/pytest-xdist/issues/855></code>_: Users can now configure <code>load</code> scheduling precision using <code>--maxschedchunk</code> command line option.</p> </li> <li> <p><code>[#858](pytest-dev/pytest-xdist#858) <https://github.com/pytest-dev/pytest-xdist/issues/858></code><em>: New <code>worksteal</code> scheduler, based on the idea of <code>work stealing <https://en.wikipedia.org/wiki/Work_stealing></code></em>. It's similar to <code>load</code> scheduler, but it should handle tests with significantly differing duration better, and, at the same time, it should provide similar or better reuse of fixtures.</p> </li> </ul> <h2>Trivial Changes</h2> <ul> <li><code>[#870](pytest-dev/pytest-xdist#870) <https://github.com/pytest-dev/pytest-xdist/issues/870></code>_: Make the tests pass even when <code>$PYTEST_XDIST_AUTO_NUM_WORKERS</code> is set.</li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/5c065198e98df484d8193a5fba5480db541fac37"><code>5c06519</code></a> Release 3.2.0</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/c695763e92951e20bd10c783c47884032826ea6d"><code>c695763</code></a> [pre-commit.ci] pre-commit autoupdate (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/869">#869</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/9373ddb3f841a009bc9669b514923b6ecba724e7"><code>9373ddb</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/870">#870</a> from hroncok/delenv</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/8fd1bfd182e87f46e2c2ff6dbb43c0cd43d0cc00"><code>8fd1bfd</code></a> Tests: Unset PYTEST_XDIST_AUTO_NUM_WORKERS when the behavior without the envv...</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/017cc72b7090dc4bb7e7ad3d0caab024feb977a8"><code>017cc72</code></a> Document limitations for debugging as well as a workaround (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/867">#867</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/cf19f76d86aa149d21242da520879b8e0ee80013"><code>cf19f76</code></a> Fix minor typos in the documentation (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/866">#866</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/691a0751bf7081224287d13c0863fc981a838380"><code>691a075</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/865">#865</a> from amezin/fix-loadsched-tests</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/e9860923bf899b283627526bf9a23cb688204d42"><code>e986092</code></a> Fix some LoadScheduling tests</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/d1dfad3e927e225c967f16928b39eee43a3d6457"><code>d1dfad3</code></a> Implement work-stealing scheduler (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/862">#862</a>)</li> <li><a href="https://github.com/pytest-dev/pytest-xdist/commit/9b0b5b1495b024940e3f5c71583711be46df255b"><code>9b0b5b1</code></a> Add --maxschedchunk CLI option (<a href="https://github-redirect.dependabot.com/pytest-dev/pytest-xdist/issues/857">#857</a>)</li> <li>Additional commits viewable in <a href="https://github.com/pytest-dev/pytest-xdist/compare/v3.1.0...v3.2.0">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=pytest-xdist&package-manager=pip&previous-version=3.1.0&new-version=3.2.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com) This PR contains the following updates: | Package | Change | Age | Adoption | Passing | Confidence | |---|---|---|---|---|---| | [pytest-xdist](https://togithub.com/pytest-dev/pytest-xdist) ([changelog](https://pytest-xdist.readthedocs.io/en/latest/changelog.html)) | `3.1.0` -> `3.2.1` | [![age](https://badges.renovateapi.com/packages/pypi/pytest-xdist/3.2.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/pytest-xdist/3.2.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/pytest-xdist/3.2.1/compatibility-slim/3.1.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/pytest-xdist/3.2.1/confidence-slim/3.1.0)](https://docs.renovatebot.com/merge-confidence/) | --- ### Release Notes <details> <summary>pytest-dev/pytest-xdist</summary> ### [`v3.2.1`](https://togithub.com/pytest-dev/pytest-xdist/blob/HEAD/CHANGELOG.rst#pytest-xdist-321-2023-03-12) [Compare Source](https://togithub.com/pytest-dev/pytest-xdist/compare/v3.2.0...v3.2.1) \=============================== ## Bug Fixes - `#884 <https://github.com/pytest-dev/pytest-xdist/issues/884>`\_: Fixed hang in `worksteal` scheduler. ### [`v3.2.0`](https://togithub.com/pytest-dev/pytest-xdist/blob/HEAD/CHANGELOG.rst#pytest-xdist-320-2023-02-07) [Compare Source](https://togithub.com/pytest-dev/pytest-xdist/compare/v3.1.0...v3.2.0) \=============================== ## Improved Documentation - `#863 <https://github.com/pytest-dev/pytest-xdist/issues/863>`\_: Document limitations for debugging due to standard I/O of workers not being forwarded. Also, mention remote debugging as a possible workaround. ## Features - `#855 <https://github.com/pytest-dev/pytest-xdist/issues/855>`\_: Users can now configure `load` scheduling precision using `--maxschedchunk` command line option. - `#858 <https://github.com/pytest-dev/pytest-xdist/issues/858>`*: New `worksteal` scheduler, based on the idea of `work stealing <https://en.wikipedia.org/wiki/Work_stealing>`*. It's similar to `load` scheduler, but it should handle tests with significantly differing duration better, and, at the same time, it should provide similar or better reuse of fixtures. ## Trivial Changes - `#870 <https://github.com/pytest-dev/pytest-xdist/issues/870>`\_: Make the tests pass even when `$PYTEST_XDIST_AUTO_NUM_WORKERS` is set. </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Enabled. ♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://app.renovatebot.com/dashboard#github/ixm-one/pytest-cmake-presets).  Signed-off-by: Renovate Bot <[email protected]> Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com) This PR contains the following updates: | Package | Change | Age | Adoption | Passing | Confidence | |---|---|---|---|---|---| | [pytest-xdist](https://togithub.com/pytest-dev/pytest-xdist) ([changelog](https://pytest-xdist.readthedocs.io/en/latest/changelog.html)) | `==2.5.0` -> `==3.3.1` | [![age](https://badges.renovateapi.com/packages/pypi/pytest-xdist/3.3.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/pytest-xdist/3.3.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/pytest-xdist/3.3.1/compatibility-slim/2.5.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/pytest-xdist/3.3.1/confidence-slim/2.5.0)](https://docs.renovatebot.com/merge-confidence/) | --- ### Release Notes <details> <summary>pytest-dev/pytest-xdist</summary> ### [`v3.3.1`](https://togithub.com/pytest-dev/pytest-xdist/blob/HEAD/CHANGELOG.rst#pytest-xdist-331-2023-05-19) [Compare Source](https://togithub.com/pytest-dev/pytest-xdist/compare/v3.3.0...v3.3.1) \=============================== ## Bug Fixes - `#907 <https://github.com/pytest-dev/pytest-xdist/issues/907>`\_: Avoid remote calls during startup as `execnet` by default does not ensure remote affinity with the main thread and might accidentally schedule the pytest worker into a non-main thread, which breaks numerous frameworks, for example `asyncio`, `anyio`, `PyQt/PySide`, etc. A more safe correction will require thread affinity in `execnet` (`pytest-dev/execnet#96 <https://github.com/pytest-dev/execnet/issues/96>`\__). ### [`v3.3.0`](https://togithub.com/pytest-dev/pytest-xdist/blob/HEAD/CHANGELOG.rst#pytest-xdist-330-2023-05-12) [Compare Source](https://togithub.com/pytest-dev/pytest-xdist/compare/v3.2.1...v3.3.0) \=============================== ## Features - `#555 <https://github.com/pytest-dev/pytest-xdist/issues/555>`\_: Improved progress output when collecting nodes to be less verbose. ### [`v3.2.1`](https://togithub.com/pytest-dev/pytest-xdist/blob/HEAD/CHANGELOG.rst#pytest-xdist-321-2023-03-12) [Compare Source](https://togithub.com/pytest-dev/pytest-xdist/compare/v3.2.0...v3.2.1) \=============================== ## Bug Fixes - `#884 <https://github.com/pytest-dev/pytest-xdist/issues/884>`\_: Fixed hang in `worksteal` scheduler. ### [`v3.2.0`](https://togithub.com/pytest-dev/pytest-xdist/blob/HEAD/CHANGELOG.rst#pytest-xdist-320-2023-02-07) [Compare Source](https://togithub.com/pytest-dev/pytest-xdist/compare/v3.1.0...v3.2.0) \=============================== ## Improved Documentation - `#863 <https://github.com/pytest-dev/pytest-xdist/issues/863>`\_: Document limitations for debugging due to standard I/O of workers not being forwarded. Also, mention remote debugging as a possible workaround. ## Features - `#855 <https://github.com/pytest-dev/pytest-xdist/issues/855>`\_: Users can now configure `load` scheduling precision using `--maxschedchunk` command line option. - `#858 <https://github.com/pytest-dev/pytest-xdist/issues/858>`*: New `worksteal` scheduler, based on the idea of `work stealing <https://en.wikipedia.org/wiki/Work_stealing>`*. It's similar to `load` scheduler, but it should handle tests with significantly differing duration better, and, at the same time, it should provide similar or better reuse of fixtures. ## Trivial Changes - `#870 <https://github.com/pytest-dev/pytest-xdist/issues/870>`\_: Make the tests pass even when `$PYTEST_XDIST_AUTO_NUM_WORKERS` is set. ### [`v3.1.0`](https://togithub.com/pytest-dev/pytest-xdist/blob/HEAD/CHANGELOG.rst#pytest-xdist-310-2022-12-01) [Compare Source](https://togithub.com/pytest-dev/pytest-xdist/compare/v3.0.2...v3.1.0) \=============================== ## Features - `#789 <https://github.com/pytest-dev/pytest-xdist/issues/789>`\_: Users can now set a default distribution mode in their configuration file: .. code-block:: ini [pytest] addopts = --dist loadscope - `#842 <https://github.com/pytest-dev/pytest-xdist/issues/842>`\_: Python 3.11 is now officially supported. ## Removals - `#842 <https://github.com/pytest-dev/pytest-xdist/issues/842>`\_: Python 3.6 is no longer supported. ### [`v3.0.2`](https://togithub.com/pytest-dev/pytest-xdist/blob/HEAD/CHANGELOG.rst#pytest-xdist-302-2022-10-25) [Compare Source](https://togithub.com/pytest-dev/pytest-xdist/compare/v2.5.0...v3.0.2) \=============================== ## Bug Fixes - `#813 <https://github.com/pytest-dev/pytest-xdist/issues/813>`\_: Cancel shutdown when a crashed worker is restarted. ## Deprecations - `#825 <https://github.com/pytest-dev/pytest-xdist/issues/825>`\_: The `--rsyncdir` command line argument and `rsyncdirs` config variable are deprecated. The rsync feature will be removed in pytest-xdist 4.0. - `#826 <https://github.com/pytest-dev/pytest-xdist/issues/826>`\_: The `--looponfail` command line argument and `looponfailroots` config variable are deprecated. The loop-on-fail feature will be removed in pytest-xdist 4.0. ## Improved Documentation - `#791 <https://github.com/pytest-dev/pytest-xdist/issues/791>`\_: Document the `pytest_xdist_auto_num_workers` hook. - `#796 <https://github.com/pytest-dev/pytest-xdist/issues/796>`\_: Added known limitations section to documentation. - `#829 <https://github.com/pytest-dev/pytest-xdist/issues/829>`\_: Document the `-n logical` option. ## Features - `#792 <https://github.com/pytest-dev/pytest-xdist/issues/792>`\_: The environment variable `PYTEST_XDIST_AUTO_NUM_WORKERS` can now be used to specify the default for `-n auto` and `-n logical`. - `#812 <https://github.com/pytest-dev/pytest-xdist/issues/812>`\_: Partially restore old initial batch distribution algorithm in `LoadScheduling`. pytest orders tests for optimal sequential execution - i. e. avoiding unnecessary setup and teardown of fixtures. So executing tests in consecutive chunks is important for optimal performance. In v1.14, initial test distribution in `LoadScheduling` was changed to round-robin, optimized for the corner case, when the number of tests is less than `2 * number of nodes`. At the same time, it became worse for all other cases. For example: if some tests use some "heavy" fixture, and these tests fit into the initial batch, with round-robin distribution the fixture will be created `min(n_tests, n_workers)` times, no matter how many other tests there are. With the old algorithm (before v1.14), if there are enough tests not using the fixture, the fixture was created only once. So restore the old behavior for typical cases where the number of tests is much greater than the number of workers (or, strictly speaking, when there are at least 2 tests for every node). ## Removals - `#468 <https://github.com/pytest-dev/pytest-xdist/issues/468>`\_: The `--boxed` command-line option has been removed. If you still need this functionality, install `pytest-forked <https://pypi.org/project/pytest-forked>`\__ separately. ## Trivial Changes - `#468 <https://github.com/pytest-dev/pytest-xdist/issues/468>`\_: The `py` dependency has been dropped. - `#822 <https://github.com/pytest-dev/pytest-xdist/issues/822>`\_: Replace internal usage of `py.log` with a custom solution (but with the same interface). - `#823 <https://github.com/pytest-dev/pytest-xdist/issues/823>`\_: Remove usage of `py._pydir` as an rsync candidate. - `#824 <https://github.com/pytest-dev/pytest-xdist/issues/824>`\_: Replace internal usages of `py.path.local` by `pathlib.Path`. </details> --- ### Configuration 📅 **Schedule**: Branch creation - "every weekend" (UTC), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://app.renovatebot.com/dashboard#github/fluencelabs/spell).  Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

amezin mentioned this issue Dec 20, 2022

Add --maxschedchunk CLI option #857

Merged

amezin added a commit to amezin/pytest-xdist that referenced this issue Jan 5, 2023

Implement work-stealing scheduling

361d8dd

Closes pytest-dev#858

amezin mentioned this issue Jan 5, 2023

Implement work-stealing scheduler #862

Merged

amezin added a commit to amezin/pytest-xdist that referenced this issue Jan 5, 2023

Implement work-stealing scheduling

11e4d5a

Closes pytest-dev#858

amezin added a commit to amezin/pytest-xdist that referenced this issue Jan 8, 2023

Implement work-stealing scheduling

df71225

Closes pytest-dev#858

nicoddemus closed this as completed in #862 Jan 11, 2023

nicoddemus pushed a commit that referenced this issue Jan 11, 2023

Implement work-stealing scheduler (#862)

d1dfad3

Closes #858

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Implement work-stealing scheduler #858

Implement work-stealing scheduler #858

amezin commented Dec 20, 2022

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Implement work-stealing scheduler #858

Implement work-stealing scheduler #858

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amezin commented Dec 20, 2022

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amezin commented Feb 7, 2023

alex commented Feb 7, 2023 via email