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runtime: disable gcMarkRootCheck debugging check during STW

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gcMarkRootCheck takes ~10ns per goroutine. This is just a debugging
check, so disable it (plus, if something is going to go wrong, it's
more likely to go wrong during concurrent mark).

We may be able to re-enable this later, or move it to after we've
started the world again. (But not for 1.6.x.)

For 1.6.x.

Fixes #14419.

name / 95%ile-time/markTerm          old          new  delta
500kIdleGs-12                24.0ms ± 0%  18.9ms ± 6%  -21.46%  (p=0.000 n=15+20)

Change-Id: Idb2a2b1771449de772c159ef95920d6df1090666
Reviewed-on: https://go-review.googlesource.com/20148
Reviewed-by: Rick Hudson <rlh@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Austin Clements 2016-03-01 21:30:26 -05:00
parent 9ab9053344
commit b5481dd0a6
1 changed files with 2 additions and 1 deletions
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3
src/runtime/mgc.go
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@ -1561,7 +1561,8 @@ func gcMark(start_time int64) {
gcDrain(gcw, gcDrainBlock)
gcw.dispose()
gcMarkRootCheck()
// TODO: Re-enable once this is cheap.
//gcMarkRootCheck()
if work.full != 0 {
throw("work.full != 0")
}