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testing: fix Benchmark() to start at 1 iteration, not 100
The run1 call removed in golang.org/cl/36990 was necessary to initialize the duration of the benchmark. With it gone, the math in launch() starts from 100. This doesn't work out well for second-long benchmark methods. Put it back. Updates #18815 Change-Id: I461f3466c805d0c61124a2974662f7ad45335794 Reviewed-on: https://go-review.googlesource.com/37530 Run-TryBot: Heschi Kreinick <heschi@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
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@ -657,7 +657,10 @@ func Benchmark(f func(b *B)) BenchmarkResult {
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benchFunc: f,
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benchTime: *benchTime,
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}
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return b.run()
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if b.run1() {
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b.run()
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}
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return b.result
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}
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type discard struct{}
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@ -7,6 +7,7 @@ package testing
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import (
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"bytes"
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"fmt"
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"os"
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"regexp"
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"runtime"
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"strings"
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@ -530,6 +531,16 @@ func TestBenchmarkOutput(t *T) {
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Benchmark(func(b *B) {})
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}
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func TestBenchmarkStartsFrom1(t *T) {
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var first = true
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Benchmark(func(b *B) {
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if first && b.N != 1 {
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panic(fmt.Sprintf("Benchmark() first N=%v; want 1", b.N))
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}
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first = false
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})
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}
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func TestParallelSub(t *T) {
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c := make(chan int)
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block := make(chan int)
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@ -591,6 +602,7 @@ func TestBenchmark(t *T) {
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res := Benchmark(func(b *B) {
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for i := 0; i < 5; i++ {
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b.Run("", func(b *B) {
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fmt.Fprintf(os.Stderr, "b.N: %v\n", b.N)
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for i := 0; i < b.N; i++ {
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time.Sleep(time.Millisecond)
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}
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