Time stdlib json versus simplejson on Python 3.2 with and without speedups

test_results.txt

Python 3.2 numbers
==================
(jst3)vinay@eta-natty:~/projects/scratch$ python time_json.py --no-speedups
Python version: 3.2 (r32:88445, Mar 25 2011, 19:28:28) 
[GCC 4.5.2]
11.21484375 KiB read
Timing simplejson (without speedups):
4.585145950317383
Timing stdlib json (without speedups):
3.9949100017547607
(jst3)vinay@eta-natty:~/projects/scratch$ python time_json.py
Python version: 3.2 (r32:88445, Mar 25 2011, 19:28:28) 
[GCC 4.5.2]
11.21484375 KiB read
Timing simplejson (with speedups):
0.3202629089355469
Timing stdlib json (with speedups):
0.3200039863586426

Python 2.7 numbers
==================
(jst)vinay@eta-natty:~/projects/scratch$ python time_json.py --no-speedups
Python version: 2.7.1+ (r271:86832, Apr 11 2011, 18:05:24) 
[GCC 4.5.2]
11.21484375 KiB read
Timing simplejson (without speedups):
4.49118304253
Timing stdlib json (without speedups):
4.2139749527
(jst)vinay@eta-natty:~/projects/scratch$ python time_json.py
Python version: 2.7.1+ (r271:86832, Apr 11 2011, 18:05:24) 
[GCC 4.5.2]
11.21484375 KiB read
Timing simplejson (with speedups):
0.279826164246
Timing stdlib json (with speedups):
0.34278011322

time_json.py

#!/usr/bin/env python
import argparse
import sys
from timeit import timeit

if sys.version_info[0] < 3:
    from urllib import urlopen
else:
    from urllib.request import urlopen

s = urlopen('http://flingo.tv/api2/get_items?app_id=flingo&guid=abc123&howmany=8').read().decode('utf-8')

def compare(speedups):
    if speedups:
        descr = 'with speedups'
    else:
        descr = 'without speedups'
        import simplejson; simplejson._toggle_speedups(False)
        sys.modules['_json'] = 0; import json

    print('Python version: %s' % sys.version)
    print("%s KiB read" % (float(len(s))/1024))

    stmt = 'd = json.loads(s);x = json.dumps(d)'
    setup='import simplejson as json;from __main__ import s'

    print('Timing simplejson (%s):' % descr)
    print(timeit(stmt, setup=setup, number=1000))

    setup='import json;from __main__ import s'

    print('Timing stdlib json (%s):' % descr)
    print(timeit(stmt, setup=setup, number=1000))

def main():
    parser = argparse.ArgumentParser(description='Compare simplejson and '
                                                 'stdlib json')
    parser.add_argument('--no-speedups', dest='speedups', action='store_false',
                        default=True, help='Disable speedups')
    args = parser.parse_args()
    compare(args.speedups)

if __name__ == '__main__':
    main()