all: Skip AllocsPerRun tests if GOMAXPROCS>1.

Fixes #4974.

R=rsc, bradfitz, r
CC=golang-dev
https://golang.org/cl/7545043

Author: alberts

src/pkg/encoding/gob/timing_test.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"runtime"
 	"testing"
 )
 
@@ -49,6 +50,10 @@ func BenchmarkEndToEndByteBuffer(b *testing.B) {
 }
 
 func TestCountEncodeMallocs(t *testing.T) {
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Skip("skipping; GOMAXPROCS>1")
+	}
+
 	const N = 1000
 
 	var buf bytes.Buffer
@@ -65,6 +70,10 @@ func TestCountEncodeMallocs(t *testing.T) {
 }
 
 func TestCountDecodeMallocs(t *testing.T) {
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Skip("skipping; GOMAXPROCS>1")
+	}
+
 	const N = 1000
 
 	var buf bytes.Buffer

src/pkg/fmt/fmt_test.go

@@ -9,6 +9,7 @@ import (
 	. "fmt"
 	"io"
 	"math"
+	"runtime"
 	"strings"
 	"testing"
 	"time"
@@ -601,6 +602,9 @@ var mallocTest = []struct {
 var _ bytes.Buffer
 
 func TestCountMallocs(t *testing.T) {
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Skip("skipping; GOMAXPROCS>1")
+	}
 	for _, mt := range mallocTest {
 		mallocs := testing.AllocsPerRun(100, mt.fn)
 		if got, max := mallocs, float64(mt.count); got > max {

src/pkg/net/http/header_test.go

@@ -6,6 +6,7 @@ package http
 
 import (
 	"bytes"
+	"runtime"
 	"testing"
 	"time"
 )
@@ -192,6 +193,9 @@ func BenchmarkHeaderWriteSubset(b *testing.B) {
 }
 
 func TestHeaderWriteSubsetMallocs(t *testing.T) {
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Skip("skipping; GOMAXPROCS>1")
+	}
 	n := testing.AllocsPerRun(100, func() {
 		buf.Reset()
 		testHeader.WriteSubset(&buf, nil)

src/pkg/net/rpc/server_test.go

@@ -465,10 +465,16 @@ func countMallocs(dial func() (*Client, error), t *testing.T) float64 {
 }
 
 func TestCountMallocs(t *testing.T) {
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Skip("skipping; GOMAXPROCS>1")
+	}
 	fmt.Printf("mallocs per rpc round trip: %v\n", countMallocs(dialDirect, t))
 }
 
 func TestCountMallocsOverHTTP(t *testing.T) {
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Skip("skipping; GOMAXPROCS>1")
+	}
 	fmt.Printf("mallocs per HTTP rpc round trip: %v\n", countMallocs(dialHTTP, t))
 }
 

src/pkg/path/filepath/path_test.go

@@ -107,6 +107,11 @@ func TestClean(t *testing.T) {
 		}
 	}
 
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Log("skipping AllocsPerRun checks; GOMAXPROCS>1")
+		return
+	}
+
 	for _, test := range tests {
 		allocs := testing.AllocsPerRun(100, func() { filepath.Clean(test.result) })
 		if allocs > 0 {

src/pkg/path/path_test.go

@@ -5,6 +5,7 @@
 package path
 
 import (
+	"runtime"
 	"testing"
 )
 
@@ -72,6 +73,11 @@ func TestClean(t *testing.T) {
 		}
 	}
 
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Log("skipping AllocsPerRun checks; GOMAXPROCS>1")
+		return
+	}
+
 	for _, test := range cleantests {
 		allocs := testing.AllocsPerRun(100, func() { Clean(test.result) })
 		if allocs > 0 {

src/pkg/reflect/all_test.go

@@ -13,6 +13,7 @@ import (
 	"math/rand"
 	"os"
 	. "reflect"
+	"runtime"
 	"sync"
 	"testing"
 	"time"
@@ -2011,6 +2012,9 @@ func TestAddr(t *testing.T) {
 }
 
 func noAlloc(t *testing.T, n int, f func(int)) {
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Skip("skipping; GOMAXPROCS>1")
+	}
 	i := -1
 	allocs := testing.AllocsPerRun(n, func() {
 		f(i)

src/pkg/sort/search_test.go

@@ -5,6 +5,7 @@
 package sort_test
 
 import (
+	"runtime"
 	. "sort"
 	"testing"
 )
@@ -127,6 +128,9 @@ func runSearchWrappers() {
 }
 
 func TestSearchWrappersDontAlloc(t *testing.T) {
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Skip("skipping; GOMAXPROCS>1")
+	}
 	allocs := testing.AllocsPerRun(100, runSearchWrappers)
 	if allocs != 0 {
 		t.Errorf("expected no allocs for runSearchWrappers, got %v", allocs)

src/pkg/strconv/strconv_test.go

@@ -5,6 +5,7 @@
 package strconv_test
 
 import (
+	"runtime"
 	. "strconv"
 	"strings"
 	"testing"
@@ -43,6 +44,9 @@ var (
 )
 
 func TestCountMallocs(t *testing.T) {
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Skip("skipping; GOMAXPROCS>1")
+	}
 	for _, mt := range mallocTest {
 		allocs := testing.AllocsPerRun(100, mt.fn)
 		if max := float64(mt.count); allocs > max {

src/pkg/time/time_test.go

@@ -11,6 +11,7 @@ import (
 	"fmt"
 	"math/big"
 	"math/rand"
+	"runtime"
 	"strconv"
 	"strings"
 	"testing"
@@ -1299,6 +1300,9 @@ var mallocTest = []struct {
 }
 
 func TestCountMallocs(t *testing.T) {
+	if runtime.GOMAXPROCS(0) > 1 {
+		t.Skip("skipping; GOMAXPROCS>1")
+	}
 	for _, mt := range mallocTest {
 		allocs := int(testing.AllocsPerRun(100, mt.fn))
 		if allocs > mt.count {