[Python-checkins] cpython: Explain concrete (resource consumption) effects of PEP 393 a bit.
antoine.pitrou
python-checkins at python.org
Thu Nov 17 02:05:02 CET 2011
http://hg.python.org/cpython/rev/bb28027fdba7
changeset: 73596:bb28027fdba7
user: Antoine Pitrou <solipsis at pitrou.net>
date: Thu Nov 17 01:59:51 2011 +0100
summary:
Explain concrete (resource consumption) effects of PEP 393 a bit.
files:
Doc/whatsnew/3.3.rst | 18 +++++++++++++-----
1 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/Doc/whatsnew/3.3.rst b/Doc/whatsnew/3.3.rst
--- a/Doc/whatsnew/3.3.rst
+++ b/Doc/whatsnew/3.3.rst
@@ -84,11 +84,19 @@
* non-BMP strings (``U+10000-U+10FFFF``) use 4 bytes per codepoint.
-.. The memory usage of Python 3.3 is two to three times smaller than Python 3.2,
- and a little bit better than Python 2.7, on a `Django benchmark
- <http://mail.python.org/pipermail/python-dev/2011-September/113714.html>`_.
- XXX The result should be moved in the PEP and a small summary about
- performances and a link to the PEP should be added here.
+ The net effect is that for most applications, memory usage of string storage
+ should decrease significantly - especially compared to former wide unicode
+ builds - as, in many cases, strings will be pure ASCII even in international
+ contexts (because many strings store non-human language data, such as XML
+ fragments, HTTP headers, JSON-encoded data, etc.). We also hope that it
+ will, for the same reasons, increase CPU cache efficiency on non-trivial
+ applications.
+
+ .. The memory usage of Python 3.3 is two to three times smaller than Python 3.2,
+ and a little bit better than Python 2.7, on a `Django benchmark
+ <http://mail.python.org/pipermail/python-dev/2011-September/113714.html>`_.
+ XXX The result should be moved in the PEP and a link to the PEP should
+ be added here.
* With the death of narrow builds, the problems specific to narrow builds have
also been fixed, for example:
--
Repository URL: http://hg.python.org/cpython
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