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tstime/rate: deflake TestLongRunningQPS

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This test is highly dependent on the accuracy of OS timers.
Reduce the number of failures by decreasing the required
accuracy from 0.999 to 0.995.
Also, switch from repeated time.Sleep to using a time.Ticker
for improved accuracy.

Updates #2727

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
(cherry picked from commit 30458c71c8)
This commit is contained in:
Joe Tsai 2021-08-30 10:46:41 -07:00
parent 15835f03b3
commit 0744d75238
1 changed files with 9 additions and 6 deletions
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15
tstime/rate/rate_test.go
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@ -182,15 +182,18 @@ func TestLongRunningQPS(t *testing.T) {
wg.Done()
}
// This will still offer ~500 requests per second,
// but won't consume outrageous amount of CPU.
start := time.Now()
end := start.Add(5 * time.Second)
for time.Now().Before(end) {
ticker := time.NewTicker(2 * time.Millisecond)
defer ticker.Stop()
for now := range ticker.C {
if now.After(end) {
break
}
wg.Add(1)
go f()
// This will still offer ~500 requests per second, but won't consume
// outrageous amount of CPU.
time.Sleep(2 * time.Millisecond)
}
wg.Wait()
elapsed := time.Since(start)
@ -201,7 +204,7 @@ func TestLongRunningQPS(t *testing.T) {
t.Errorf("numOK = %d, want %d (ideal %f)", numOK, want, ideal)
}
// We should get very close to the number of requests allowed.
if want := int32(0.999 * ideal); numOK < want {
if want := int32(0.995 * ideal); numOK < want {
t.Errorf("numOK = %d, want %d (ideal %f)", numOK, want, ideal)
}
}