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testing: add AllocsPerRun

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This CL also replaces similar loops in other stdlib
package tests with calls to AllocsPerRun.

Fixes #4461.

R=minux.ma, rsc
CC=golang-dev
https://golang.org/cl/7002055
This commit is contained in:
Kyle Lemons 2013-02-02 22:52:29 -05:00 • committed by Russ Cox
parent f418c505d0
commit 9bfd3c3937
10 changed files with 105 additions and 144 deletions
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39
src/pkg/encoding/gob/timing_test.go
View file

@ -9,7 +9,6 @@ import (
"fmt"
"io"
"os"
"runtime"
"testing"
)
@ -50,49 +49,43 @@ func BenchmarkEndToEndByteBuffer(b *testing.B) {
}
func TestCountEncodeMallocs(t *testing.T) {
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(1))
const N = 1000
var buf bytes.Buffer
enc := NewEncoder(&buf)
bench := &Bench{7, 3.2, "now is the time", []byte("for all good men")}
memstats := new(runtime.MemStats)
runtime.ReadMemStats(memstats)
mallocs := 0 - memstats.Mallocs
const count = 1000
for i := 0; i < count; i++ {
allocs := testing.AllocsPerRun(N, func() {
err := enc.Encode(bench)
if err != nil {
t.Fatal("encode:", err)
}
}
runtime.ReadMemStats(memstats)
mallocs += memstats.Mallocs
fmt.Printf("mallocs per encode of type Bench: %d\n", mallocs/count)
})
fmt.Printf("mallocs per encode of type Bench: %v\n", allocs)
}
func TestCountDecodeMallocs(t *testing.T) {
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(1))
const N = 1000
var buf bytes.Buffer
enc := NewEncoder(&buf)
bench := &Bench{7, 3.2, "now is the time", []byte("for all good men")}
const count = 1000
for i := 0; i < count; i++ {
// Fill the buffer with enough to decode
testing.AllocsPerRun(N, func() {
err := enc.Encode(bench)
if err != nil {
t.Fatal("encode:", err)
}
}
})
dec := NewDecoder(&buf)
memstats := new(runtime.MemStats)
runtime.ReadMemStats(memstats)
mallocs := 0 - memstats.Mallocs
for i := 0; i < count; i++ {
allocs := testing.AllocsPerRun(N, func() {
*bench = Bench{}
err := dec.Decode(&bench)
if err != nil {
t.Fatal("decode:", err)
}
}
runtime.ReadMemStats(memstats)
mallocs += memstats.Mallocs
fmt.Printf("mallocs per decode of type Bench: %d\n", mallocs/count)
})
fmt.Printf("mallocs per decode of type Bench: %v\n", allocs)
}