[issue17900] Recursive OrderedDict pickling
Serhiy Storchaka
report at bugs.python.org
Sat May 4 10:08:18 CEST 2013
Serhiy Storchaka added the comment:
In additional the patch decreases the size of the pickled data, speeds up pickling and unpickling.
$ ./python -c "import collections, pickle; od = collections.OrderedDict((i, i) for i in range(100000)); print(len(pickle.dumps(od)))"
Without patch: 1536827.
With patch: 737578.
$ ./python -m timeit -s "from pickle import dumps; import collections; od = collections.OrderedDict((i, i) for i in range(100000))" "dumps(od)"
Without patch: 454 msec.
With patch: 361 msec.
$ ./python -m timeit -s "from pickle import dumps, loads; import collections; od = collections.OrderedDict((i, i) for i in range(100000)); x = dumps(od)" "loads(x)"
Without patch: 1.41 sec.
With patch: 1.15 sec.
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<http://bugs.python.org/issue17900>
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