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runtime/trace: fix flaky test for SetMinAge

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This change fixes the flaky test which expects setting SetMinAge to a
small ammount. It expects two sync events but should realistically
expect up to 3.

Change-Id: Ibd02fe55ebca99eb880025eb968fcebae9cb09c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/675597
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Carlos Amedee 2025-05-22 13:33:28 -04:00
parent db55b83ce4
commit db3e02994c
1 changed files with 12 additions and 7 deletions
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19
src/runtime/trace/flightrecorder_test.go
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@ -170,7 +170,7 @@ func TestFlightRecorderLog(t *testing.T) {
}
}
func TestFlightRecorderOneGeneration(t *testing.T) {
func TestFlightRecorderGenerationCount(t *testing.T) {
test := func(t *testing.T, fr *trace.FlightRecorder) {
tr := testFlightRecorder(t, fr, func(snapshot func()) {
// Sleep to let a few generations pass.
@ -184,7 +184,7 @@ func TestFlightRecorderOneGeneration(t *testing.T) {
t.Fatalf("unexpected error creating trace reader: %v", err)
}
// Make sure there are exactly two Sync events: at the start and end.
// Make sure there are Sync events: at the start and end.
var syncs []int
evs := 0
for {
@ -200,13 +200,18 @@ func TestFlightRecorderOneGeneration(t *testing.T) {
}
evs++
}
if ends := []int{0, evs - 1}; !slices.Equal(syncs, ends) {
t.Errorf("expected two sync events (one at each end of the trace), found %d at %d instead of %d",
len(syncs), syncs[:min(len(syncs), 5)], ends)
const wantMaxSyncs = 3
if len(syncs) > wantMaxSyncs {
t.Errorf("expected at most %d sync events, found %d at %d",
wantMaxSyncs, len(syncs), syncs)
}
ends := []int{syncs[0], syncs[len(syncs)-1]}
if wantEnds := []int{0, evs - 1}; !slices.Equal(wantEnds, ends) {
t.Errorf("expected a sync event at each end of the trace, found sync events at %d instead of %d",
ends, wantEnds)
}
}
t.Run("SetMinAge", func(t *testing.T) {
t.Skip("issue 63185: flaky test")
t.Run("MinAge", func(t *testing.T) {
fr := trace.NewFlightRecorder(trace.FlightRecorderConfig{MinAge: time.Millisecond})
test(t, fr)
})