python json benchmark.py

import time
import json
import ujson
import cjson
import yajl
import simplejson

DATA = [{
    'words': """
        Lorem ipsum dolor sit amet, consectetur adipiscing
        elit. Mauris adipiscing adipiscing placerat.
        Vestibulum augue augue,
        pellentesque quis sollicitudin id, adipiscing.
        """,
    'list': range(50),
    'dict': dict((str(i), 'a') for i in xrange(50)),
    'int': 100,
    'float': 100.123456
}]

for N, data in [(5, 0), (3, 2), (2, 3)]:
    print '\n-- N=1e%s, len(text)=%s\n' % (N, len(ujson.dumps(DATA)) * 10 ** data)
    N = 10 ** N
    data = DATA * 10 ** data

    ref = None
    for j in [ujson, cjson, yajl, simplejson, json]:
        dts = []

        f = j.encode if j == cjson else j.dumps
        for i in range(0, N):
            d = list(data)
            t = time.time()
            s = f(d)
            t = time.time() - t
            dts.append(t)

        f = j.decode if j == cjson else j.loads
        for i in range(0, N):
            t = time.time()
            x = f(s)
            t = time.time() - t
            dts.append(t)

        tot = [sum(dts[:N]), sum(dts[N:])]
        if not ref:
            ref = tot
        print '%10s   %.1f   %.1f' % (f.__module__, tot[0] / ref[0], tot[1] / ref[1])


"""
-- N=1e5, len(text)=854

     ujson   1.0   1.0
     cjson   2.6   1.9
      yajl   2.6   1.9
simplejson   4.4   2.0
      json   3.4   4.2

-- N=1e5, len(text)=8540

     ujson   1.0   1.0
     cjson   3.1   1.8
      yajl   2.9   1.7
simplejson   3.5   1.7
      json   3.2   4.5

-- N=1e3, len(text)=85400

     ujson   1.0   1.0
     cjson   2.7   1.5
      yajl   2.6   1.5
simplejson   2.9   1.2
      json   3.0   3.6

-- N=1e2, len(text)=854000

     ujson   1.0   1.0
     cjson   2.7   1.4
      yajl   2.6   1.5
simplejson   3.2   1.1
      json   3.3   3.5
"""