summaryrefslogtreecommitdiffstats
path: root/src/sync/runtime_sema_test.go
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:14:23 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:14:23 +0000
commit73df946d56c74384511a194dd01dbe099584fd1a (patch)
treefd0bcea490dd81327ddfbb31e215439672c9a068 /src/sync/runtime_sema_test.go
parentInitial commit. (diff)
downloadgolang-1.16-73df946d56c74384511a194dd01dbe099584fd1a.tar.xz
golang-1.16-73df946d56c74384511a194dd01dbe099584fd1a.zip
Adding upstream version 1.16.10.upstream/1.16.10upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/sync/runtime_sema_test.go')
-rw-r--r--src/sync/runtime_sema_test.go75
1 files changed, 75 insertions, 0 deletions
diff --git a/src/sync/runtime_sema_test.go b/src/sync/runtime_sema_test.go
new file mode 100644
index 0000000..152cf0e
--- /dev/null
+++ b/src/sync/runtime_sema_test.go
@@ -0,0 +1,75 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sync_test
+
+import (
+ "runtime"
+ . "sync"
+ "testing"
+)
+
+func BenchmarkSemaUncontended(b *testing.B) {
+ type PaddedSem struct {
+ sem uint32
+ pad [32]uint32
+ }
+ b.RunParallel(func(pb *testing.PB) {
+ sem := new(PaddedSem)
+ for pb.Next() {
+ Runtime_Semrelease(&sem.sem, false, 0)
+ Runtime_Semacquire(&sem.sem)
+ }
+ })
+}
+
+func benchmarkSema(b *testing.B, block, work bool) {
+ if b.N == 0 {
+ return
+ }
+ sem := uint32(0)
+ if block {
+ done := make(chan bool)
+ go func() {
+ for p := 0; p < runtime.GOMAXPROCS(0)/2; p++ {
+ Runtime_Semacquire(&sem)
+ }
+ done <- true
+ }()
+ defer func() {
+ <-done
+ }()
+ }
+ b.RunParallel(func(pb *testing.PB) {
+ foo := 0
+ for pb.Next() {
+ Runtime_Semrelease(&sem, false, 0)
+ if work {
+ for i := 0; i < 100; i++ {
+ foo *= 2
+ foo /= 2
+ }
+ }
+ Runtime_Semacquire(&sem)
+ }
+ _ = foo
+ Runtime_Semrelease(&sem, false, 0)
+ })
+}
+
+func BenchmarkSemaSyntNonblock(b *testing.B) {
+ benchmarkSema(b, false, false)
+}
+
+func BenchmarkSemaSyntBlock(b *testing.B) {
+ benchmarkSema(b, true, false)
+}
+
+func BenchmarkSemaWorkNonblock(b *testing.B) {
+ benchmarkSema(b, false, true)
+}
+
+func BenchmarkSemaWorkBlock(b *testing.B) {
+ benchmarkSema(b, true, true)
+}