8000 5x increase cpu usage of uv__async_io.part.1 in v14.19.0 vs v14.18.3 · Issue #42027 · nodejs/node · GitHub
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5x increase cpu usage of uv__async_io.part.1 in v14.19.0 vs v14.18.3  #42027
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5x increase cpu usage of uv__async_io.part.1 in v14.19.0 vs v14.18.3 #42027
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libuvIssues and PRs related to the libuv dependency or the uv binding.performanceIssues and PRs related to the performance of Node.js.
@murillo128

Description

@murillo128
murillo128
opened on Feb 17, 2022

Version

v14.19.0

Platform

Linux 5.13.0-28-generic #31~20.04.1-Ubuntu SMP Wed Jan 19 14:08:10 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

Subsystem

libuv

What steps will reproduce the bug?

I have taken a flamegraph (https://www.brendangregg.com/flamegraphs.html) of my server code running under full load. Not sure if i could provide an example that triggers the same behaviour.

How often does it reproduce? Is there a required condition?

No response

What is the expected behavior?

node v12.18.3

image

What do you see instead?

node v14.19.0
image

which is almost a 5x cpu usage increase vs the previous v14 version

Additional information

The only commit between those 2 versions that could impact libuv is this one #40631
which adds -fno-strict-aliasing flag to libuv

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