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test: deflake locklinear again

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Fixes #19276.

Change-Id: I64f8f80331d09956b6698c0b004ed7f7d70857fc
Reviewed-on: https://go-review.googlesource.com/39591
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Russ Cox 2017-04-05 09:56:39 -04:00
parent 10991fd5af
commit 92cf05daf3
1 changed files with 11 additions and 3 deletions
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14
test/locklinear.go
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@ -38,17 +38,25 @@ func checkLinear(typ string, tries int, f func(n int)) {
n := tries
fails := 0
var buf bytes.Buffer
inversions := 0
for {
t1 := timeF(n)
t2 := timeF(2 * n)
if debug {
println(n, t1.String(), 2*n, t2.String())
}
fmt.Fprintf(&buf, "%d %v %d %v\n", n, t1, 2*n, t2)
// should be 2x (linear); allow up to 2.5x
if t1*3/2 < t2 && t2 < t1*5/2 {
fmt.Fprintf(&buf, "%d %v %d %v (%.1fX)\n", n, t1, 2*n, t2, float64(t2)/float64(t1))
// should be 2x (linear); allow up to 3x
if t1*3/2 < t2 && t2 < t1*3 {
return
}
if t2 < t1 {
if inversions++; inversions >= 5 {
// The system must be overloaded (some builders). Give up.
return
}
continue // try again; don't increment fails
}
// Once the test runs long enough for n ops,
// try to get the right ratio at least once.
// If many in a row all fail, give up.