Johannes Baiter <[email protected]> added the comment:
I got bitten by this when running my jpegtran bindings under PyPy.
To extract EXIF data from JPEG images, I'm using indexed access on bytearrays a
lot.
To illustrate the issue, the following (using IPython):
[1] import jpegtran
[2] %timeit -n10 -r5
jpegtran.JPEGImage('someimage.jpg').exif_thumbnail.as_blob()
gives 49.1ms as a 'best case' on CPython while it's ~2570ms on PyPy.
The source for the module can be found here:
https://github.com/jbaiter/jpegtran-cffi/blob/master/jpegtran/lib.py#L150
I also attached profiling data for PyPy.
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nosy: +jbaiter
status: unread -> chatting
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<https://bugs.pypy.org/issue1695>
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