net: add benchmarks for network interface identification

Current results on linux/amd64:
BenchmarkInterfaces                      20000             80902 ns/op
BenchmarkInterfaceByIndex                50000             71591 ns/op
BenchmarkInterfaceByName                 20000             79908 ns/op
BenchmarkInterfaceAddrs                   2000            836413 ns/op
BenchmarkInterfacesAndAddrs               5000            605946 ns/op
BenchmarkInterfacesAndMulticastAddrs     10000            169029 ns/op

Update #4866.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7368046

diff --git a/src/pkg/net/interface_test.go b/src/pkg/net/interface_test.go
index 803c1f4495ca1bb7481a5c8fb344ded58ff98eef..0b75f97ce9898acf98e560e6497db70d4842ee2c 100644 (file)
--- a/src/pkg/net/interface_test.go
+++ b/src/pkg/net/interface_test.go
@@ -9,6 +9,21 @@ import (
        "testing"
 )
 
+// LoopbackInterface returns a logical network interface for loopback
+// tests.
+func loopbackInterface() *Interface {
+       ift, err := Interfaces()
+       if err != nil {
+               return nil
+       }
+       for _, ifi := range ift {
+               if ifi.Flags&FlagLoopback != 0 && ifi.Flags&FlagUp != 0 {
+                       return &ifi
+               }
+       }
+       return nil
+}
+
 func sameInterface(i, j *Interface) bool {
        if i == nil || j == nil {
                return false
@@ -29,10 +44,10 @@ func TestInterfaces(t *testing.T) {
        for _, ifi := range ift {
                ifxi, err := InterfaceByIndex(ifi.Index)
                if err != nil {
-                       t.Fatalf("InterfaceByIndex(%q) failed: %v", ifi.Index, err)
+                       t.Fatalf("InterfaceByIndex(%v) failed: %v", ifi.Index, err)
                }
                if !sameInterface(ifxi, &ifi) {
-                       t.Fatalf("InterfaceByIndex(%q) = %v, want %v", ifi.Index, *ifxi, ifi)
+                       t.Fatalf("InterfaceByIndex(%v) = %v, want %v", ifi.Index, *ifxi, ifi)
                }
                ifxn, err := InterfaceByName(ifi.Name)
                if err != nil {
@@ -102,3 +117,67 @@ func testMulticastAddrs(t *testing.T, ifmat []Addr) {
                }
        }
 }
+
+func BenchmarkInterfaces(b *testing.B) {
+       for i := 0; i < b.N; i++ {
+               if _, err := Interfaces(); err != nil {
+                       b.Fatalf("Interfaces failed: %v", err)
+               }
+       }
+}
+
+func BenchmarkInterfaceByIndex(b *testing.B) {
+       ifi := loopbackInterface()
+       if ifi == nil {
+               return
+       }
+       for i := 0; i < b.N; i++ {
+               if _, err := InterfaceByIndex(ifi.Index); err != nil {
+                       b.Fatalf("InterfaceByIndex failed: %v", err)
+               }
+       }
+}
+
+func BenchmarkInterfaceByName(b *testing.B) {
+       ifi := loopbackInterface()
+       if ifi == nil {
+               return
+       }
+       for i := 0; i < b.N; i++ {
+               if _, err := InterfaceByName(ifi.Name); err != nil {
+                       b.Fatalf("InterfaceByName failed: %v", err)
+               }
+       }
+}
+
+func BenchmarkInterfaceAddrs(b *testing.B) {
+       for i := 0; i < b.N; i++ {
+               if _, err := InterfaceAddrs(); err != nil {
+                       b.Fatalf("InterfaceAddrs failed: %v", err)
+               }
+       }
+}
+
+func BenchmarkInterfacesAndAddrs(b *testing.B) {
+       ifi := loopbackInterface()
+       if ifi == nil {
+               return
+       }
+       for i := 0; i < b.N; i++ {
+               if _, err := ifi.Addrs(); err != nil {
+                       b.Fatalf("Interface.Addrs failed: %v", err)
+               }
+       }
+}
+
+func BenchmarkInterfacesAndMulticastAddrs(b *testing.B) {
+       ifi := loopbackInterface()
+       if ifi == nil {
+               return
+       }
+       for i := 0; i < b.N; i++ {
+               if _, err := ifi.MulticastAddrs(); err != nil {
+                       b.Fatalf("Interface.MulticastAddrs failed: %v", err)
+               }
+       }
+}