[Python-Dev] Status of json (simplejson) in cpython

[Matt Billenstein]

On Fri, Apr 15, 2011 at 05:03:55PM -0700, Bob Ippolito wrote:
> On Fri, Apr 15, 2011 at 4:12 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:
> > On Fri, 15 Apr 2011 14:27:04 -0700
> > Bob Ippolito <bob at redivi.com> wrote:
> >> On Fri, Apr 15, 2011 at 2:20 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:
> >
> > Well, here's a crude microbenchmark. I'm comparing 2.6+simplejson 2.1.3
> > to 3.3+json, so I'm avoiding integers:
> >
> > * json.dumps:
> >
> > $ python -m timeit -s "from simplejson import dumps, loads; \
> > ?? ??d = dict((str(i), str(i)) for i in range(1000))" \
> > ?? "dumps(d)"
> >
> > - 2.6+simplejson: 372 usec per loop
> > - 3.2+json: 352 usec per loop
> >
> > * json.loads:
> >
> > $ python -m timeit -s "from simplejson import dumps, loads; \
> > ?? ??d = dict((str(i), str(i)) for i in range(1000)); s = dumps(d)" \
> > ?? ??"loads(s)"
> >
> > - 2.6+simplejson: 224 usec per loop
> > - 3.2+json: 233 usec per loop
> >
> >
> > The runtimes look quite similar.
> 
> That's the problem with trivial benchmarks. With more typical data
> (for us, anyway) you should see very different results.

Slightly less crude benchmark showing simplejson is quite a bit faster:

http://pastebin.com/g1WqUPwm

250ms vs 5.5s encoding and decoding an 11KB json object 1000 times...

m

-- 
Matt Billenstein
matt at vazor.com
http://www.vazor.com/