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runtime: clamp OS-reported number of processors to _MaxGomaxprocs

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So that all Go processes do not die on startup on a system with >256 CPUs.

I tested this by hacking osinit to set ncpu to 1000.

Updates #15131

Change-Id: I52e061a0de97be41d684dd8b748fa9087d6f1aef
Reviewed-on: https://go-review.googlesource.com/21599
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Michael Hudson-Doyle 2016-04-07 11:47:32 +12:00
parent a037c73ccf
commit 31cf1c1779
1 changed files with 3 additions and 0 deletions
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3
src/runtime/proc.go
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@ -449,6 +449,9 @@ func schedinit() {
sched.lastpoll = uint64(nanotime()) sched.lastpoll = uint64(nanotime())
procs := int(ncpu) procs := int(ncpu)
if procs > _MaxGomaxprocs {
procs = _MaxGomaxprocs
}
if n := atoi(gogetenv("GOMAXPROCS")); n > 0 { if n := atoi(gogetenv("GOMAXPROCS")); n > 0 {
if n > _MaxGomaxprocs { if n > _MaxGomaxprocs {
n = _MaxGomaxprocs n = _MaxGomaxprocs