first code/readme/license commit

misc/tests/socktest_udp_nodial.go

@@ -0,0 +1,88 @@
+package main
+
+import "fmt"
+import "net"
+import "time"
+import "flag"
+import "os"
+import "runtime/pprof"
+
+// TODO look into netmap + libpcap to bypass the kernel as much as possible
+
+func basic_test() {
+
+  // TODO need a way to look up who our link-local neighbors are for each iface!
+
+  sock, err := net.ListenUDP("udp", nil)
+  if err != nil { panic(err) }
+  defer sock.Close()
+
+  ch := make(chan []byte, 1)
+
+  writer := func () {
+    raddr := sock.LocalAddr().(*net.UDPAddr)
+    //send, err := net.ListenUDP("udp", nil)
+    //if err != nil { panic(err) }
+    //defer send.Close()
+    for {
+      select {
+        case <-ch:
+        default:
+      }
+      msg := make([]byte, 1280)
+      sock.WriteToUDP(msg, raddr)
+      //send.WriteToUDP(msg, raddr)
+    }
+  }
+  go writer()
+  //go writer()
+  //go writer()
+  //go writer()
+
+  numPackets := 65536
+  size := 0
+  start := time.Now()
+  success := 0
+  for i := 0 ; i < numPackets ; i++ {
+    msg := make([]byte, 2048)
+    n, _, err := sock.ReadFromUDP(msg)
+    if err != nil { panic(err) }
+    size += n
+    select {
+      case ch <- msg: success += 1
+      default:
+    }
+  }
+  timed := time.Since(start)
+
+  fmt.Printf("%f packets per second\n", float64(numPackets)/timed.Seconds())
+  fmt.Printf("%f bits per second\n", 8*float64(size)/timed.Seconds())
+  fmt.Println("Success:", success, "/", numPackets)
+}
+
+var cpuprofile = flag.String("cpuprofile", "", "write cpu profile `file`")
+var memprofile = flag.String("memprofile", "", "write memory profile to this file")
+
+func main () {
+  flag.Parse()
+  if *cpuprofile != "" {
+      f, err := os.Create(*cpuprofile)
+      if err != nil {
+          panic(fmt.Sprintf("could not create CPU profile: ", err))
+      }
+      if err := pprof.StartCPUProfile(f); err != nil {
+          panic(fmt.Sprintf("could not start CPU profile: ", err))
+      }
+      defer pprof.StopCPUProfile()
+  }
+  if *memprofile != "" {
+      f, err := os.Create(*memprofile)
+      if err != nil {
+          panic(fmt.Sprintf("could not create memory profile: ", err))
+      }
+      defer func () { pprof.WriteHeapProfile(f) ; f.Close() }()
+  }
+  basic_test()
+
+}
+