New submission from poq <p...@gmx.com>:
import json, timeit
obj = [[1,2,3]*10]*10
class writable(object):
def write(self, buf): pass
w = writable()
print('dumps: %.3f' % timeit.timeit(lambda: json.dumps(obj), number=10000))
print('dump: %.3f' % timeit.timeit(lambda: json.dump(obj,w), number=10000))
On my machine this outputs:
dumps: 0.391
dump: 4.501
I believe this is mostly caused by dump using JSONEncoder.iterencode without
_one_shot=True, resulting in c_make_encoder not being used.
----------
components: Extension Modules
messages: 136439
nosy: poq
priority: normal
severity: normal
status: open
title: json.dump much slower than dumps
type: performance
versions: Python 2.7, Python 3.2
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12134>
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