gh-109649: Fix test_os.test_process_cpu_count_affinity()#111689
Merged
vstinner merged 1 commit intopython:mainfrom Nov 3, 2023
Merged
gh-109649: Fix test_os.test_process_cpu_count_affinity()#111689vstinner merged 1 commit intopython:mainfrom
vstinner merged 1 commit intopython:mainfrom
Conversation
When CPUs are isolated on Linux, os.process_cpu_count() is smaller than os.cpu_count(). Fix the test for this case. Example with "isolcpus=5,11 rcu_nocbs=5,11" options passed to a Linux command line to isolated two logical CPUs: $ ./python -c 'import os; print(os.process_cpu_count(), "/", os.cpu_count())' 10 / 12
Member
Author
|
@corona10 @gpshead: Do you think that it would be worth it to document this special case in os.process_cpu_count()? "On Linux, if some CPUs are isolated, os.process_cpu_count() reports less usable CPUs than os.cpu_count()." Or is it a known fact? I'm asking if we should "advertize" more this function to users this way ;-) |
gpshead
approved these changes
Nov 3, 2023
Member
I think we can consider this "known" in the sense that the number of possible ways for this to be true on a system is more than we can accurately enumerate in our docs. |
Member
Author
|
Ok, thanks for the review @gpshead. |
aisk
pushed a commit
to aisk/cpython
that referenced
this pull request
Feb 11, 2024
…n#111689) When CPUs are isolated on Linux, os.process_cpu_count() is smaller than os.cpu_count(). Fix the test for this case. Example with "isolcpus=5,11 rcu_nocbs=5,11" options passed to a Linux command line to isolated two logical CPUs: $ ./python -c 'import os; print(os.process_cpu_count(), "/", os.cpu_count())' 10 / 12
Glyphack
pushed a commit
to Glyphack/cpython
that referenced
this pull request
Sep 2, 2024
…n#111689) When CPUs are isolated on Linux, os.process_cpu_count() is smaller than os.cpu_count(). Fix the test for this case. Example with "isolcpus=5,11 rcu_nocbs=5,11" options passed to a Linux command line to isolated two logical CPUs: $ ./python -c 'import os; print(os.process_cpu_count(), "/", os.cpu_count())' 10 / 12
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
When CPUs are isolated on Linux, os.process_cpu_count() is smaller than os.cpu_count(). Fix the test for this case.
Example with "isolcpus=5,11 rcu_nocbs=5,11" options passed to a Linux command line to isolated two logical CPUs: