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Source file src/runtime/norace_test.go

Documentation: runtime

  // 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.
  // +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(0)
  			for i := 0; i < work; i++ {
  				foo *= 2
  				foo /= 2
  			}
  			runtime.Exitsyscall(0)
  		}
  		_ = foo
  	})
  }
  

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