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- package main
- import (
- "sync"
- "sync/atomic"
- "testing"
- )
- type nopad struct {
- x uint64
- y uint64
- }
- type withpad struct {
- x uint64
- _pad [7]uint64
- y uint64
- }
- func BenchmarkNoPad(b *testing.B) {
- for i := 0; i < b.N; i++ {
- var np nopad
- var wg sync.WaitGroup
- wg.Add(20)
- for i := 0; i < 10; i++ {
- go func() {
- defer wg.Done()
- for {
- if atomic.AddUint64(&np.x, 1) >= 10000000 {
- return
- }
- }
- }()
- }
- for i := 0; i < 10; i++ {
- go func() {
- defer wg.Done()
- for {
- if atomic.AddUint64(&np.y, 1) >= 10000000 {
- return
- }
- }
- }()
- }
- wg.Wait()
- }
- }
- func BenchmarkWithPad(b *testing.B) {
- for i := 0; i < b.N; i++ {
- var np withpad
- var wg sync.WaitGroup
- wg.Add(20)
- for i := 0; i < 10; i++ {
- go func() {
- defer wg.Done()
- for {
- if atomic.AddUint64(&np.x, 1) >= 10000000 {
- return
- }
- }
- }()
- }
- for i := 0; i < 10; i++ {
- go func() {
- defer wg.Done()
- for {
- if atomic.AddUint64(&np.y, 1) >= 10000000 {
- return
- }
- }
- }()
- }
- wg.Wait()
- }
- }
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