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Make @threads :dynamic default #44136

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IanButterworth
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Follow-up to #43919

Makes the new :dynamic schedule for Threads.@threads the default.

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@tkf
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tkf commented Feb 12, 2022

Just for future search-ability, this PR is a conclusion of the feature seeded in #35646 and implemented in #43919. PR #43919 introduced :dynamic scheduling and triage has already decided that it's a good fit for the default scheduler option of @threads for (#43919 (comment)).

The change in the code is minimal. So, I think it can be merged once CI is sufficiently happy.

@DilumAluthge DilumAluthge merged commit 976dcc8 into JuliaLang:master Feb 13, 2022
@IanButterworth IanButterworth deleted the ib/threads_dynamic_default branch February 13, 2022 06:46
@DilumAluthge DilumAluthge removed the merge me PR is reviewed. Merge when all tests are passing label Feb 13, 2022
Schedule options are:
- `:static` creates one task per thread and divides the iterations equally among
them, assigning each task specifically to each thread.
Specifying `:static` is an error if used from inside another `@threads` loop
or from a thread other than 1.
- `:dynamic` will schedule iterations dynamically to available worker threads,
- `:dynamic` (default) will schedule iterations dynamically to available worker threads,
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Perhaps the default should be listed first

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makes sense #44163

@tkf tkf added the multithreading Base.Threads and related functionality label Feb 14, 2022
antoine-levitt pushed a commit to antoine-levitt/julia that referenced this pull request Feb 17, 2022
Co-authored-by: Takafumi Arakaki <takafumi.a@gmail.com>
LilithHafner pushed a commit to LilithHafner/julia that referenced this pull request Feb 22, 2022
Co-authored-by: Takafumi Arakaki <takafumi.a@gmail.com>
LilithHafner pushed a commit to LilithHafner/julia that referenced this pull request Mar 8, 2022
Co-authored-by: Takafumi Arakaki <takafumi.a@gmail.com>
jakobnissen added a commit to jakobnissen/julia that referenced this pull request Aug 28, 2022
The docs on multithreading still warns that the default scheduler for @threads
uses static scheduling. However, since JuliaLang#44136, dynamic scheduling has been the
default. This commit removes the warning.
KristofferC pushed a commit that referenced this pull request Aug 29, 2022
The docs on multithreading still warns that the default scheduler for @threads
uses static scheduling. However, since #44136, dynamic scheduling has been the
default. This commit removes the warning.
KristofferC pushed a commit that referenced this pull request Aug 30, 2022
The docs on multithreading still warns that the default scheduler for @threads
uses static scheduling. However, since #44136, dynamic scheduling has been the
default. This commit removes the warning.

(cherry picked from commit 72222d6)
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4 participants