bytes: cut 10 seconds off the race builder's benchmark test

Don't benchmark so many sizes during the race builder's benchmark run.

This package doesn't even use goroutines.

Cuts off 10 seconds.

Updates #17104

Change-Id: Ibb2c7272c18b9014a775949c656a5b930f197cd4
Reviewed-on: https://go-review.googlesource.com/29158
Reviewed-by: David Crawshaw <crawshaw@golang.org>

diff --git a/src/bytes/bytes_test.go b/src/bytes/bytes_test.go
index e9a022b91a989f5a16a5cde24515a76968d41c30..a4c701c8e8f0b58193135260a763b5740b452ec1 100644 (file)
--- a/src/bytes/bytes_test.go
+++ b/src/bytes/bytes_test.go
@@ -7,8 +7,10 @@ package bytes_test
 import (
        . "bytes"
        "fmt"
+       "internal/testenv"
        "math/rand"
        "reflect"
+       "strings"
        "testing"
        "unicode"
        "unicode/utf8"
@@ -384,6 +386,9 @@ func valName(x int) string {
 
 func benchBytes(b *testing.B, sizes []int, f func(b *testing.B, n int)) {
        for _, n := range sizes {
+               if isRaceBuilder && n > 4<<10 {
+                       continue
+               }
                b.Run(valName(n), func(b *testing.B) {
                        if len(bmbuf) < n {
                                bmbuf = make([]byte, n)
@@ -396,6 +401,8 @@ func benchBytes(b *testing.B, sizes []int, f func(b *testing.B, n int)) {
 
 var indexSizes = []int{10, 32, 4 << 10, 4 << 20, 64 << 20}
 
+var isRaceBuilder = strings.HasSuffix(testenv.Builder(), "-race")
+
 func BenchmarkIndexByte(b *testing.B) {
        benchBytes(b, indexSizes, bmIndexByte(IndexByte))
 }