pal init: Init membarrier() before first thread to improve start time #106724
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
dotnet-policy-service
bot
added
the
community-contribution
jkotas
reviewed
Aug 21, 2024
harisokanovic
force-pushed
the
dev/harisokn/improve-membarrier-init
branch
from
10107a0
to
27896a2
Compare
wash-amzn
reviewed
Aug 21, 2024
… improve start time InitializeFlushProcessWriteBuffers() initializes expedited membarrier() syscall on Linux, which is much slower when called in a multi-thread process. Move this init earlier to improve dotnet process start time. A detailed explanation can be found in issue 106722. Fixes dotnet#106722
harisokanovic
force-pushed
the
dev/harisokn/improve-membarrier-init
branch
from
27896a2
to
bc7dbdd
Compare
jkotas
approved these changes
Aug 21, 2024
|
@dotnet-policy-service agree company="Amazon" |
This comment was marked as resolved.
This comment was marked as resolved.
This comment was marked as resolved.
This comment was marked as resolved.
|
@jkotas, is it possible to backport this change to dotnet8? |
|
/backport to release/9.0 |
|
Started backporting to release/9.0: https://github.com/dotnet/runtime/actions/runs/10514758065 |
4 tasks
I can backport it to .NET 9 RC for now. This change does not meet our default servicing bar. It is a perf fix that is not fixing a regression, the problem existed for number of years since membarrier was introduced. Given that the fix is very simple and it provides measurable improvement for every app, I can ask for an exception for .NET 8 backport after the fix bakes for several months in main and .NET 9. |
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Outdated suggestions cannot be applied.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.
pal init: InitializeFlushProcessWriteBuffers() before first thread to improve start time
InitializeFlushProcessWriteBuffers() initializes expedited membarrier()
syscall on Linux, which is much slower when called in a multi-thread
process. Move this init earlier to improve dotnet process start time.
A detailed explanation can be found in issue 106722.
Fixes #106722