diff options
| -rw-r--r-- | src/runtime/gc_test.go | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/runtime/gc_test.go b/src/runtime/gc_test.go index d683d89fe4..4895a0e2ac 100644 --- a/src/runtime/gc_test.go +++ b/src/runtime/gc_test.go @@ -10,6 +10,7 @@ import ( "reflect" "runtime" "runtime/debug" + "sync" "sync/atomic" "testing" "time" @@ -643,3 +644,34 @@ func BenchmarkBulkWriteBarrier(b *testing.B) { runtime.KeepAlive(ptrs) } + +func BenchmarkScanStackNoLocals(b *testing.B) { + var ready sync.WaitGroup + teardown := make(chan bool) + for j := 0; j < 10; j++ { + ready.Add(1) + go func() { + x := 100000 + countpwg(&x, &ready, teardown) + }() + } + ready.Wait() + b.ResetTimer() + for i := 0; i < b.N; i++ { + b.StartTimer() + runtime.GC() + runtime.GC() + b.StopTimer() + } + close(teardown) +} + +func countpwg(n *int, ready *sync.WaitGroup, teardown chan bool) { + if *n == 0 { + ready.Done() + <-teardown + return + } + *n-- + countpwg(n, ready, teardown) +} |