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// Copyright 2012, Google, Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree.
package gopacket
import (
"runtime"
"testing"
)
// A few benchmarks for figuring out exactly how fast some underlying Go
// things are.
type testError struct{}
func (t *testError) Error() string { return "abc" }
func BenchmarkTypeAssertion(b *testing.B) {
var e error = &testError{}
for i := 0; i < b.N; i++ {
_, _ = e.(*testError)
}
}
func BenchmarkMapLookup(b *testing.B) {
m := map[LayerType]bool{
LayerTypePayload: true,
}
for i := 0; i < b.N; i++ {
_ = m[LayerTypePayload]
}
}
func BenchmarkNilMapLookup(b *testing.B) {
var m map[LayerType]bool
for i := 0; i < b.N; i++ {
_ = m[LayerTypePayload]
}
}
func BenchmarkNilMapLookupWithNilCheck(b *testing.B) {
var m map[LayerType]bool
for i := 0; i < b.N; i++ {
if m != nil {
_ = m[LayerTypePayload]
}
}
}
func BenchmarkArrayLookup(b *testing.B) {
m := make([]bool, 100)
for i := 0; i < b.N; i++ {
_ = m[LayerTypePayload]
}
}
var testError1 = &testError{}
var testError2 error = testError1
func BenchmarkTypeToInterface1(b *testing.B) {
var e error
for i := 0; i < b.N; i++ {
e = testError1
}
// Have to do someting with 'e' or the compiler complains about an unused
// variable.
testError2 = e
}
func BenchmarkTypeToInterface2(b *testing.B) {
var e error
for i := 0; i < b.N; i++ {
e = testError2
}
// Have to do someting with 'e' or the compiler complains about an unused
// variable.
testError2 = e
}
var decodeOpts DecodeOptions
func decodeOptsByValue(_ DecodeOptions) {}
func decodeOptsByPointer(_ *DecodeOptions) {}
func BenchmarkPassDecodeOptionsByValue(b *testing.B) {
for i := 0; i < b.N; i++ {
decodeOptsByValue(decodeOpts)
}
}
func BenchmarkPassDecodeOptionsByPointer(b *testing.B) {
for i := 0; i < b.N; i++ {
decodeOptsByPointer(&decodeOpts)
}
}
func BenchmarkLockOSThread(b *testing.B) {
for i := 0; i < b.N; i++ {
runtime.LockOSThread()
}
}
func BenchmarkUnlockOSThread(b *testing.B) {
for i := 0; i < b.N; i++ {
runtime.UnlockOSThread()
}
}
func lockUnlock() {
runtime.LockOSThread()
runtime.UnlockOSThread()
}
func lockDeferUnlock() {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
}
func BenchmarkLockUnlockOSThread(b *testing.B) {
for i := 0; i < b.N; i++ {
lockUnlock()
}
}
func BenchmarkLockDeferUnlockOSThread(b *testing.B) {
for i := 0; i < b.N; i++ {
lockDeferUnlock()
}
}
func BenchmarkUnbufferedChannel(b *testing.B) {
ca := make(chan bool)
cb := make(chan bool)
defer close(ca)
go func() {
defer close(cb)
for range ca {
cb <- true
}
}()
for i := 0; i < b.N; i++ {
ca <- true
<-cb
}
}
func BenchmarkSmallBufferedChannel(b *testing.B) {
ca := make(chan bool, 1)
cb := make(chan bool, 1)
defer close(ca)
go func() {
defer close(cb)
for range ca {
cb <- true
}
}()
for i := 0; i < b.N; i++ {
ca <- true
<-cb
}
}
func BenchmarkLargeBufferedChannel(b *testing.B) {
ca := make(chan bool, 1000)
cb := make(chan bool, 1000)
defer close(ca)
go func() {
defer close(cb)
for range ca {
cb <- true
}
}()
for i := 0; i < b.N; i++ {
ca <- true
<-cb
}
}
func BenchmarkEndpointFastHashShort(b *testing.B) {
e := Endpoint{typ: 1, len: 2}
for i := 0; i < b.N; i++ {
e.FastHash()
}
}
func BenchmarkEndpointFastHashLong(b *testing.B) {
e := Endpoint{typ: 1, len: 16}
for i := 0; i < b.N; i++ {
e.FastHash()
}
}
func BenchmarkFlowFastHashShort(b *testing.B) {
e := Flow{typ: 1, slen: 2, dlen: 2}
for i := 0; i < b.N; i++ {
e.FastHash()
}
}
func BenchmarkFlowFastHashLong(b *testing.B) {
e := Flow{typ: 1, slen: 16, dlen: 16}
for i := 0; i < b.N; i++ {
e.FastHash()
}
}
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