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test: deflake locklinear a little 

This should help on the openbsd systems where the test mostly passes.

I don't expect it to help on s390x where the test reliably fails.
But it should give more information when it does fail.

For #19276.

Change-Id: I496c291f2b4b0c747b8dd4315477d87d03010059
Reviewed-on: https://go-review.googlesource.com/37348
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Russ Cox 2017-02-24 16:01:50 -05:00
parent 67fcd9c5d9
commit 349b7820eb
1 changed files with 16 additions and 9 deletions
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25
test/locklinear.go
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@ -9,6 +9,7 @@
package main
import (
"bytes"
"fmt"
"log"
"os"
@ -36,12 +37,14 @@ func checkLinear(typ string, tries int, f func(n int)) {
n := tries
fails := 0
var buf bytes.Buffer
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 {
return
@ -56,23 +59,27 @@ func checkLinear(typ string, tries int, f func(n int)) {
}
// Once the test runs long enough for n ops,
// try to get the right ratio at least once.
// If five in a row all fail, give up.
if fails++; fails >= 5 {
panic(fmt.Sprintf("%s: too slow: %d ops: %v; %d ops: %v\n",
typ, n, t1, 2*n, t2))
// If many in a row all fail, give up.
if fails++; fails >= 10 {
panic(fmt.Sprintf("%s: too slow: %d ops: %v; %d ops: %v\n\n%s",
typ, n, t1, 2*n, t2, buf.String()))
}
}
}
const offset = 251 // known size of runtime hash table
const profile = false
func main() {
f, err := os.Create("lock.prof")
if err != nil {
log.Fatal(err)
if profile {
f, err := os.Create("lock.prof")
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
checkLinear("lockone", 1000, func(n int) {
ch := make(chan int)