英文:
Where to put setup/teardown in Go Benchmarks?
问题
我在一个go的测试文件中编写了一个基准测试函数，代码如下：
func BenchmarkStuff(b *testing.B) {
for i := 0; i < b.N; i++ {
stuff()
}
}
然而，stuff() 函数在每次运行之前都需要进行一些设置，并且在每次运行之后都需要进行清理。我有两个函数 setup() 和 cleanup() 分别用于进行设置和清理操作。但是我不想对设置和清理函数进行基准测试。
那么它们应该在哪里调用呢？如果我在 BenchmarkStuff 函数内部调用它们，它们将会被计入结果测量中。但是如果没有它们，stuff() 函数将会失败。
英文:
I have a go test file in which I wrote a benchmark function as follows:
func BenchmarkStuff(b *testing.B) {
for i := 0; i < b.N; i++ {
stuff()
}
}
However the stuff() function requires some setup to occur every time before it runs and cleanup to occur every time after it runs. I have functions setup() and cleanup() that do this respectively. But I don't want to benchmark the setup and cleanup functions.
So where should they be called? If I call them inside BenchmarkStuff, they will be added to the results measurements. But without them, stuff() will fail.
答案1
得分: 20
基准测试包提供了ResetTimer、StopTimer和StartTimer方法，用于避免基准测试所需的计时初始化。
如果需要进行一次初始化，请在开始循环之前使用ResetTimer：
func BenchmarkStuff(b *testing.B) {
setup()
b.ResetTimer()
for i := 0; i < b.N; i++ {
stuff()
}
}
如果需要在循环过程中重新初始化，可以使用StopTimer和StartTimer来避免计时该部分：
func BenchmarkStuff(b *testing.B) {
for i := 0; i < b.N; i++ {
b.StopTimer()
setup()
b.StartTimer()
stuff()
}
}
英文:
The benchmarking package provides ResetTimer, StopTimer and StartTimer methods to avoid timing initialization needed for the benchmark.
If initialization is needed once, use ResetTimer before starting your loop:
func BenchmarkStuff(b *testing.B) {
setup()
b.ResetTimer()
for i := 0; i < b.N; i++ {
stuff()
}
}
If you need to re-initialize during the loop, you can use StopTimer and StartTimer to avoid timing that portion:
func BenchmarkStuff(b *testing.B) {
for i := 0; i < b.N; i++ {
b.StopTimer()
setup()
b.StartTimer()
stuff()
}
}
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