"""
Micro-benchmark. Run it with:

./python.orig benchmark.py script bench.py --file=orig
./python.patched benchmark.py script bench.py --file=patch
./python.patched benchmark.py compare_to orig patch

Download benchmark.py from:

https://bitbucket.org/haypo/misc/raw/tip/python/benchmark.py
"""

def run_benchmark(bench):
    for btype in ('bytes', 'bytearray'):
        bench.start_group('type %s' % btype)
        for length in ('10', '10**3', '10**5'):
            bench.timeit(setup='x = %s(b"x" * %s)' % (btype, length),
                         stmt='x.replace(b"", b"-")',
                         name='length=%s' % length)