Issue 6013: json slower than simplejson (original) (raw)

Created on 2009-05-13 14:33 by theller, last changed 2022-04-11 14:56 by admin. This issue is now closed.

Messages (4)
msg87685 - (view)	Author: Thomas Heller (theller) *	Date: 2009-05-13 14:32
The json package is a lot slower than the simplejson package. Both packages have their C compiled speedup module; however: C:\>py26 -m timeit -s "from json import dumps, loads" "loads(dumps(range(32)))" 1000 loops, best of 3: 618 usec per loop C:\>py26 -m timeit -s "from simplejson import dumps, loads" "loads(dumps(range(32)))" 10000 loops, best of 3: 31 usec per loop This is on Windows XP, with Python 2.6.2.
msg87686 - (view)	Author: Antoine Pitrou (pitrou) *	Date: 2009-05-13 14:38
This is probably because your simplejson is much more recent than the json version shipped with 2.6. Can you try again with trunk and post the numbers?
msg87687 - (view)	Author: Thomas Heller (theller) *	Date: 2009-05-13 14:55
Here are the numbers from trunk (rev ) and release26-maint branch (rev ): c:\svn\release26-maint\PCbuild>python -m timeit -s "from json import loads, dumps" "loads(dumps(range(32)))" 1000 loops, best of 3: 726 usec per loop c:\svn\release26-maint\PCbuild>cd ..\..\trunk\PCbuild c:\svn\trunk\PCbuild>python -m timeit -s "from json import loads, dumps" "loads(dumps(range(32)))" 10000 loops, best of 3: 33.5 usec per loop So, the performance issue seems fixed in trunk but not in release26-maint. (This stuff is an issue for me since I want to use jsonrpc on an embedded system. Cross-compiling Python is a pain, but installing simplejson which uses setuptools is even more painful.)
msg87688 - (view)	Author: Antoine Pitrou (pitrou) *	Date: 2009-05-13 15:07
Given the amount of changed code between the two simplejson versions, I'm afraid there's no way the new version will be backported to release26-maint. You can probably do the backport manually in your Python install, though (or bite the bullet and use SVN trunk, which is rather stable currently).