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After a stream is created ev/sleep takes 100% CPU. #1321

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bitcompost opened this issue Oct 28, 2023 · 4 comments
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After a stream is created ev/sleep takes 100% CPU. #1321

bitcompost opened this issue Oct 28, 2023 · 4 comments
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bug This is not expected behavior, and needs fixing

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@bitcompost
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Steps to reproduce:

Janet 1.32.1-meson linux/aarch64/gcc - '(doc)' for help
repl:1:> (net/connect "1.1.1.1" "80")
<core/stream 0xAAAACB3E0010>
repl:2:> (ev/sleep 42)
@bakpakin
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Cannot reproduce on linux/x64. Is this for some reason only arm? Also would be interested in your linux kernel version.

@bakpakin bakpakin added the bug This is not expected behavior, and needs fixing label Oct 28, 2023
@bitcompost
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I can reproduce it on x64. Kernel 6.2.0-35-generic #35~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Fri Oct 6 10:23:26 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

@bitcompost
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Did some more testing. It only hapens with the meson build.

@bakpakin
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Ok, looks like the meson build by default is using the poll event loop instead of the epoll event loop, so the bug is with the poll event loop.

With meson, you can fix this for now using

meson setup build -Depoll=true

when configuring the project (and get more efficient as well).

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@bakpakin @bitcompost