In article <76vs9tf1f6c5...@mid.individual.net>, Thomas Heller <thel...@python.net> wrote: > Diez B. Roggisch schrieb: > > Thomas Heller wrote: > >> Python 2.6 contains the json module, which I thought was the renamed (and > >> improved?) simplejson module that also works on older Python versions. > >> > >> However, it seems the json is a lot slower than simplejson. > >> This little test, run on Python 2.6.2 and WinXP shows a dramatic > >> difference: > >> 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> >> > >> Does anyone have an explanation for that? > > > > Dunno about json, but simplejson comes with an (optional) C-based > > speedup-module. > > > > Maybe this isn't part of the standard distribution? > json has it's own _json speedup module. And funny, on Linux, json > WITH _json is still somewhat slower (~10%) than simplejson WITHOUT > the _speedups module.
According to the svn history in 2.6, the json module was a copy of simplejson 1.9. The current version of simplejson is 2.0.9 and, according to its CHANGES.txt, there have been a number of performance improvements in the various releases since 1.9. Looks like the trunk (2.7) version of json has been updated to the latest simplejson. -- Ned Deily, n...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
