From: Charles-François Natali <neologix@free.fr>
Date: Tue, 1 Jan 2013 15:31:54 +0000 (+0100)
Subject: Issue #16787: Increase asyncore and asynchat default output buffers size, to
X-Git-Tag: v3.4.0a1~1725
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=fe22dcaba7c5df856359b364fc3c51e76cc3cc67;p=python

Issue #16787: Increase asyncore and asynchat default output buffers size, to
decrease CPU usage and increase throughput.
---

diff --git a/Lib/asynchat.py b/Lib/asynchat.py
index bb636ab7a5..f055d63ba4 100644
--- a/Lib/asynchat.py
+++ b/Lib/asynchat.py
@@ -56,8 +56,8 @@ class async_chat (asyncore.dispatcher):
 
     # these are overridable defaults
 
-    ac_in_buffer_size       = 4096
-    ac_out_buffer_size      = 4096
+    ac_in_buffer_size       = 65536
+    ac_out_buffer_size      = 65536
 
     # we don't want to enable the use of encoding by default, because that is a
     # sign of an application bug that we don't want to pass silently
diff --git a/Lib/asyncore.py b/Lib/asyncore.py
index b15ddeb91b..f1466436d1 100644
--- a/Lib/asyncore.py
+++ b/Lib/asyncore.py
@@ -532,7 +532,7 @@ class dispatcher_with_send(dispatcher):
 
     def initiate_send(self):
         num_sent = 0
-        num_sent = dispatcher.send(self, self.out_buffer[:512])
+        num_sent = dispatcher.send(self, self.out_buffer[:65536])
         self.out_buffer = self.out_buffer[num_sent:]
 
     def handle_write(self):
diff --git a/Misc/NEWS b/Misc/NEWS
index 88a73e4790..ccbf416e3a 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -200,7 +200,10 @@ Core and Builtins
 Library
 -------
 
-- Issue 10527: make multiprocessing use poll() instead of select() if available.
+- Issue #16787: Increase asyncore and asynchat default output buffers size, to
+  decrease CPU usage and increase throughput.
+
+- Issue #10527: make multiprocessing use poll() instead of select() if available.
 
 - Issue #16688: Fix backreferences did make case-insensitive regex fail on
   non-ASCII strings. Patch by Matthew Barnett.