[issue14621] Hash function is not randomized properly

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I tested different kind of strings.

$ ./python -m timeit -n 1 -s "t = b'a' * 10**8"  "hash(t)"
$ ./python -m timeit -n 1 -s "t = 'a' * 10**8"  "hash(t)"
$ ./python -m timeit -n 1 -s "t = '\u0100' * 10**8"  "hash(t)"
$ ./python -m timeit -n 1 -s "t = '\U00010000' * 10**8"  "hash(t)"

       current   SipHash

bytes  181 msec  453 msec  2.5x
UCS1   429 msec  453 msec  1.06x
UCS2   179 msec  897 msec  5x
UCS4   183 msec  1.79 sec  9.8x

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14621>
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