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100% CPU in epoll_wait #4241

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rvansa opened this issue Sep 27, 2019 · 2 comments · Fixed by #4242
Closed

100% CPU in epoll_wait #4241

rvansa opened this issue Sep 27, 2019 · 2 comments · Fixed by #4242
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@stuartwdouglas
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kind/bug Something isn't working
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0.23.2

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@rvansa
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rvansa commented Sep 27, 2019

Describe the bug
In some environments, using native image, all threads reading I/O can spend 100% CPU time polling epoll_wait(..., timeout=0). Turns out this is an effect of static final io.netty.util.concurrent.ScheduledFutureTask.START_TIME being set to system-dependent System.nanoTime() during compilation and the NioEventLoop behaving in an unexpected way.

Note that this behaviour cannot be reproduced when compiling and running on the same machine, due to the nature of System.nanoTime() base value.
@rvansa rvansa added the kind/bug Something isn't working label Sep 27, 2019
rvansa added a commit to rvansa/quarkus that referenced this issue Sep 27, 2019
@rvansa
quarkusio#4241 100% CPU in epoll_wait
c51a26d
@Sanne
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Sanne commented Sep 27, 2019

thanks @rvansa ! Pinging @stuartwdouglas as I believe he was looking as well into moving such initializations to runtime.

@rvansa
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rvansa commented Sep 27, 2019

Could someone on quarkus-dev ml also ping this user who seems to suffer from the same problem?
https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/quarkus-dev/jjwCQJMV434/mlujuFClAAAJ

@stuartwdouglas stuartwdouglas self-assigned this Sep 27, 2019
@stuartwdouglas stuartwdouglas mentioned this issue Sep 27, 2019
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rvansa added a commit to rvansa/quarkus that referenced this issue Sep 30, 2019
@rvansa
quarkusio#4241 100% CPU in epoll_wait
f4d5e66
rvansa added a commit to rvansa/quarkus that referenced this issue Sep 30, 2019
@rvansa
quarkusio#4241 100% CPU in epoll_wait
a80f970
kenfinnigan added a commit that referenced this issue Sep 30, 2019
@kenfinnigan
Merge pull request #4242 from rvansa/4241_cpu_spinning_epoll_wait
e24eda3 
#4241 100% CPU in epoll_wait
@rvansa rvansa mentioned this issue Oct 1, 2019
Merged
@gsmet gsmet added this to the 0.23.2 milestone Oct 1, 2019
@gsmet gsmet closed this as completed Oct 1, 2019
gsmet pushed a commit that referenced this issue Oct 1, 2019
@rvansa @gsmet
#4241 100% CPU in epoll_wait
0624b8b
gsmet pushed a commit that referenced this issue Oct 2, 2019
@rvansa @gsmet
Fix 100% CPU in epoll_wait
3b3933a 
Fixes #4241
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@stuartwdouglas stuartwdouglas

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kind/bug Something isn't working
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0.23.2
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@Sanne @stuartwdouglas @gsmet @rvansa