[Python-Dev] Status of json (simplejson) in cpython (original) (raw)
Antoine Pitrou solipsis at pitrou.net
Sat Apr 16 01:12:29 CEST 2011
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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: > Le vendredi 15 avril 2011 à 14:18 -0700, Bob Ippolito a écrit : >> On Friday, April 15, 2011, Antoine Pitrou <solipsis at pitrou.net> wrote: >> >> >> >> > Since the JSON spec is set in stone, the changes >> >> > will mostly be about API (indentation, object conversion, etc) >> >> > and optimization. I presume the core parsing logic won't >> >> > be changing much. >> >> >> >> Actually the core parsing logic is very different (and MUCH faster), >> > >> > Are you talking about the Python logic or the C logic? >> >> Both, actually. IIRC simplejson in pure python typically beats json >> with it's C extension. > > Really? It would be nice to see some concrete benchmarks against both > repo tips.
Maybe in a few weeks or months when I have time to finish up the benchmarks that I was working on... but it should be pretty easy for anyone to show that the version in CPython is very slow (and uses a lot more memory) in comparison to simplejson.
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.
Antoine.
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