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Streamline _walkdirs_utf8 for utf8 file systems, reducing time to traverse a mozilla tree from 1s to .6 seconds. (Robert Collins)

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bzrlib/lsprof.py
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def profile(f, *args, **kwds):
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    """XXX docstring"""
 
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    """Run a function profile.
 
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    :return: The functions return value and a stats object.
 
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    """
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    global _g_threadmap
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    p = Profiler()
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    p.enable(subcalls=True)