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// Copyright 2013 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.
// The file contains tests that cannot run under race detector for some reason.
//
//go:build !race
package runtime_test
import (
"runtime"
"testing"
)
// Syscall tests split stack between Entersyscall and Exitsyscall under race detector.
func BenchmarkSyscall(b *testing.B) {
benchmarkSyscall(b, 0, 1)
}
func BenchmarkSyscallWork(b *testing.B) {
benchmarkSyscall(b, 100, 1)
}
func BenchmarkSyscallExcess(b *testing.B) {
benchmarkSyscall(b, 0, 4)
}
func BenchmarkSyscallExcessWork(b *testing.B) {
benchmarkSyscall(b, 100, 4)
}
func benchmarkSyscall(b *testing.B, work, excess int) {
b.SetParallelism(excess)
b.RunParallel(func(pb *testing.PB) {
foo := 42
for pb.Next() {
runtime.Entersyscall()
for i := 0; i < work; i++ {
foo *= 2
foo /= 2
}
runtime.Exitsyscall()
}
_ = foo
})
}
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