Xiang Zhang added the comment:
The test on my box is reverse and stable, python3 is unpatched and python is
patched. Anyway, it can't be called significant.
./python3 -m perf timeit --compare-to /home/angwer/repos/cpython/python -s
'import struct; u = struct.Struct("100000Q").unpack;
b=b"abcd\x00\x00\x00\x00"*100000' 'u(b)'
python: ..................... 2.96 ms +- 0.05 ms
python3: ..................... 3.13 ms +- 0.03 ms
Median +- std dev: [python] 2.96 ms +- 0.05 ms -> [python3] 3.13 ms +- 0.03 ms:
1.06x slower
./python3 -m perf timeit --compare-to /home/angwer/repos/cpython/python -s
'import struct; u = struct.Struct("<100000Q").unpack;
b=b"abcd\x00\x00\x00\x00"*100000' 'u(b)'
python: ..................... 2.96 ms +- 0.05 ms
python3: ..................... 3.13 ms +- 0.14 ms
Median +- std dev: [python] 2.96 ms +- 0.05 ms -> [python3] 3.13 ms +- 0.14 ms:
1.06x slower
./python3 -m perf timeit --compare-to /home/angwer/repos/cpython/python -s
'import struct; u = struct.Struct(">100000Q").unpack;
b=b"\x00\x00\x00\x00dcba"*100000' 'u(b)'
python: ..................... 3.51 ms +- 0.09 ms
python3: ..................... 3.67 ms +- 0.06 ms
Median +- std dev: [python] 3.51 ms +- 0.09 ms -> [python3] 3.67 ms +- 0.06 ms:
1.05x slower
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<http://bugs.python.org/issue30224>
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