From: Antoine Pitrou <solipsis@pitrou.net>
Date: Sat, 28 Mar 2009 19:45:26 +0000 (+0000)
Subject: Publicize 3.1-specific performance enhancements
X-Git-Tag: v3.1a2~187
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=b556452055590c6d8f658d90c6be00aec31f5620;p=python

Publicize 3.1-specific performance enhancements
---

diff --git a/Doc/whatsnew/3.1.rst b/Doc/whatsnew/3.1.rst
index 56e586951b..40d7afdc22 100644
--- a/Doc/whatsnew/3.1.rst
+++ b/Doc/whatsnew/3.1.rst
@@ -112,3 +112,27 @@ Some smaller changes made to the core Python language are:
 
 
 .. ======================================================================
+
+
+Optimizations
+-------------
+
+Major performance enhancements have been added:
+
+* The new I/O library (as defined in :pep:`3116`) was mostly written in
+  Python and quickly proved to be a problematic bottleneck in Python 3.0.
+  In Python 3.1, the I/O library has been entirely rewritten in C and is
+  2 to 20 times faster depending on the task at hand. The pure Python
+  version is still available for experimentation purposes through
+  the ``_pyio`` module.
+
+  (Contributed by Amaury Forgeot d'Arc and Antoine Pitrou.)
+
+* A new configure flag, ``--with-computed-gotos``, enables a faster opcode
+  dispatch mechanism on compilers which support it. Speedups of up to 20%
+  have been observed, depending on the system and compiler.
+
+  (Contributed by Antoine Pitrou, :issue:`4753`.)
+
+
+.. ======================================================================