fb6f8a96f2
Currently we wake up new worker threads whenever we pass through the scheduler with nmspinning==0. This leads to lots of unnecessary thread wake ups. Instead let only spinning threads wake up new spinning threads. For the following program: package main import "runtime" func main() { for i := 0; i < 1e7; i++ { runtime.Gosched() } } Before: $ time ./test real 0m4.278s user 0m7.634s sys 0m1.423s $ strace -c ./test % time seconds usecs/call calls errors syscall 99.93 9.314936 3 2685009 17536 futex After: $ time ./test real 0m1.200s user 0m1.181s sys 0m0.024s $ strace -c ./test % time seconds usecs/call calls errors syscall 3.11 0.000049 25 2 futex Fixes #13527 Change-Id: Ia1f5bf8a896dcc25d8b04beb1f4317aa9ff16f74 Reviewed-on: https://go-review.googlesource.com/17540 Reviewed-by: Austin Clements <austin@google.com> Run-TryBot: Dmitry Vyukov <dvyukov@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> |
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