net-rpc: Send all data in one TCP packet

This optimises the TCP layer significantly, avoids ACK delays.

Inspired by: Julien Thewys

bzr revid: p_christ@hol.gr-20110118125903-5hrg89kpi1vuadv9

bin/tiny_socket.py

@@ -61,15 +61,7 @@ class mysocket:
         
     def mysend(self, msg, exception=False, traceback=None):
         msg = cPickle.dumps([msg,traceback])
-        size = len(msg)
-        self.sock.send('%8d' % size)
-        self.sock.send(exception and "1" or "0")
-        totalsent = 0
-        while totalsent < size:
-            sent = self.sock.send(msg[totalsent:])
-            if sent == 0:
-                raise RuntimeError, "socket connection broken"
-            totalsent = totalsent + sent
+        self.sock.sendall('%8d%s%s' % (len(msg), exception and "1" or "0", msg))
             
     def myreceive(self):
         buf=''