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test/chan: avoid wrap-around in memstats comparison

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The select2.go test assumed that the memory allocated between
its two samplings of runtime.ReadMemStats is strictly
increasing.  To avoid failing the tests when this is not true,
a greater-than check is introduced before computing the
difference in allocated memory.

R=golang-dev, r, cshapiro
CC=golang-dev
https://golang.org/cl/13701046
This commit is contained in:
Carl Shapiro 2013-09-20 17:27:56 -07:00
parent 0826c04e14
commit 1c45f98fa3
1 changed files with 2 additions and 1 deletions
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3
test/chan/select2.go
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@ -47,7 +47,8 @@ func main() {
runtime.GC()
runtime.ReadMemStats(memstats)
if memstats.Alloc-alloc > 1.1e5 {
// Be careful to avoid wraparound.
if memstats.Alloc > alloc && memstats.Alloc-alloc > 1.1e5 {
println("BUG: too much memory for 100,000 selects:", memstats.Alloc-alloc)
}
}