From: Josh Bleecher Snyder <josharian@gmail.com>
Date: Fri, 9 Jun 2017 18:28:42 +0000 (-0700)
Subject: runtime: make map deletion benchmarks faster to run
X-Git-Tag: go1.10beta1~1624
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=38044eca7c67981aa0c98847a35ec2daf0763d0e;p=gostls13.git

runtime: make map deletion benchmarks faster to run

This reduces the wall time to run these benchmarks by about 30%.

Change-Id: I494a93c93e5acb1514510d85f65796f62e1629a5
Reviewed-on: https://go-review.googlesource.com/54650
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
---

diff --git a/src/runtime/map_test.go b/src/runtime/map_test.go
index 81f05a0613..59e9c94c3f 100644
--- a/src/runtime/map_test.go
+++ b/src/runtime/map_test.go
@@ -635,7 +635,7 @@ func benchmarkMapAssignInt32(b *testing.B, n int) {
 }
 
 func benchmarkMapDeleteInt32(b *testing.B, n int) {
-	a := make(map[int32]int)
+	a := make(map[int32]int, n*b.N)
 	for i := 0; i < n*b.N; i++ {
 		a[int32(i)] = i
 	}
@@ -653,7 +653,7 @@ func benchmarkMapAssignInt64(b *testing.B, n int) {
 }
 
 func benchmarkMapDeleteInt64(b *testing.B, n int) {
-	a := make(map[int64]int)
+	a := make(map[int64]int, n*b.N)
 	for i := 0; i < n*b.N; i++ {
 		a[int64(i)] = i
 	}
@@ -680,7 +680,7 @@ func benchmarkMapDeleteStr(b *testing.B, n int) {
 	for i := 0; i < n*b.N; i++ {
 		k[i] = strconv.Itoa(i)
 	}
-	a := make(map[string]int)
+	a := make(map[string]int, n*b.N)
 	for i := 0; i < n*b.N; i++ {
 		a[k[i]] = i
 	}