first code/readme/license commit

misc/tests/tcptest.go

@@ -0,0 +1,96 @@
+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?
+
+const buffSize = 32
+
+func basic_test() {
+
+  // TODO need a way to look up who our link-local neighbors are for each iface!
+
+  addr, err := net.ResolveTCPAddr("tcp", "[::1]:9001")
+  if err != nil { panic(err) }
+  listener, err := net.ListenTCP("tcp", addr)
+  if err != nil { panic(err) }
+  defer listener.Close()
+
+  go func () {
+    send, err := net.DialTCP("tcp", nil, addr)
+    if err != nil { panic(err) }
+    defer send.Close()
+    msg := make([]byte, 1280)
+    bss := make(net.Buffers, 0, 1024)
+    count := 0
+    for {
+      time.Sleep(100*time.Millisecond)
+      for len(bss) < count {
+        bss = append(bss, msg)
+      }
+      bss.WriteTo(send)
+      count++
+      //send.Write(msg)
+    }
+  }()
+
+  numPackets := 1000000
+  start := time.Now()
+  //msg := make([]byte, 1280)
+  sock, err := listener.AcceptTCP()
+  if err != nil { panic(err) }
+  defer sock.Close()
+  for {
+    msg := make([]byte, 1280*buffSize)
+    n, err := sock.Read(msg)
+    if err != nil { panic(err) }
+    msg = msg[:n]
+    fmt.Println("Read:", n)
+    for len(msg) > 1280 {
+      // handle message
+      msg = msg[1280:]
+    }
+    // handle remaining fragment of message
+    //fmt.Println(n)
+  }
+  timed := time.Since(start)
+
+  fmt.Printf("%f packets per second\n", float64(numPackets)/timed.Seconds())
+
+  _ = func (in (chan<- int)) {
+    close(in)
+  }
+
+}
+
+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()
+
+}
+