Use sleep in flock wait loop
#12861
Merged
Use sleep in flock wait loop
#12861
Conversation
This file contains 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
straight-shoota
force-pushed
the
fix/flock-sleep
branch
from
56b1905
to
60af3ce
Compare
beta-ziliani
approved these changes
Dec 21, 2022
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
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Outdated suggestions cannot be applied.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.
Since #12728, when a file lock can't be attained immediately, blocking flock waits in a loop an tries again until the lock becomes available.
As commented in #12728 (comment), the relatively tight loop with
Fiber.yieldcan drive up CPU utilization.This patch lets the fiber sleep for 100ms. That amount isn't set in stone, but it's probably a good start. I've copied it from the Ruby implementation: https://github.com/ruby/ruby/blob/5404e2fd31736af3a7477f3ec67d3f07276485d6/file.c#L5283-L5308