[issue19780] Pickle 4 frame headers optimization

[STINNER Victor]

STINNER Victor added the comment:

> This causes very unstable results for this test data.

So try os.system("sync; echo 3 > /proc/sys/vm/drop_caches") in your timeit benchmark.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19780>
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