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yufenglee
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1. Do not reuse the main thread. 2. Do not plus one when mlas calculate the number of tasks to schedule. (It was me put the plus one there) This is the second try of #1839 It's known that this change has negative performance impact on some of the models.
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## Describe your changes ## Checklist before requesting a review - [ ] Add unit tests for this change. - [ ] Make sure all tests can pass. - [ ] Update documents if necessary. - [ ] Lint and apply fixes to your code by running `lintrunner -a` - [ ] Is this a user-facing change? If yes, give a description of this change to be included in the release notes. - [ ] Is this PR including examples changes? If yes, please remember to update [example documentation](https://github.com/microsoft/Olive/blob/main/docs/source/examples.md) in a follow-up PR. ## (Optional) Issue link
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Description:
A small improvement to the parallel_for when task count > thread count
Before this change: The recommended thread pool size is number of cpu cores minus one.
After this change: The recommended thread pool size is number of cpu cores
The new code is more like the parallelFor in Eigen::ThreadPoolDevice. Especially the " if (total > NumThreads()) " logic is the same.
Motivation and Context
If you have 4 cores, and 4 tasks, that's fine.
But if you have 4 cores, but 8 tasks, if one task need 1 unit time, the old code need 3 unit time, but the new code only need 2.
Related PR:
#947
#1646