2013/7/3 Eleytherios Stamatogiannakis <estama@gmail.com>

We also found a case where PyPy is 2x slower than CPython. The following code:

This is because of I/O.
If I replace the file with a custom class which has an empty write() method,
pypy is twice faster than CPython.

Note: with pypy, io.open() is even slower :-(


import cPickle

fileIter=open("pypytesting", "w+b")
mylist = ["qwerty"] * 100

for i in xrange(1000000):
        cPickle.dump(mylist, fileIter,1)


Runs at:
        CPython 2.7.3:  13.114 sec
        PyPy nightly:    29.239 sec

[Warning: it'll produce a file (pypytesting) that is 205 MB in size]

Kind regards,

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Amaury Forgeot d'Arc