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Thanks, Victor and Antone. I'm somewhat surprised at the 2-3x numbers you're seeing, as I was consistently getting 4-5x in the Linux tests I did. But it does depend quite a bit on what file system you're running, what hardware, whether you're running in a VM, etc. Still, 2-3x faster is a good speedup!
The numbers are significantly better on Windows, as you can see. Even the smallest numbers I've seen with "--scandir os" are around 12x range on Windows.
In any case, Victor's last tests are "right" -- I presume we'll have *some* C, so what we want to be comparing is "benchmark.py --scandir c" versus "benchmark.py --scandir os": the some C version versus the all C version in the attached CPython 3.5 patch.
BTW, Victor, "Generic" isn't really useful. I just used it as a test case that calls listdir() and os.stat() to implement the scandir/DirEntry interface. So it's going to be strictly slower than listdir + stat due to using listdir and creating all those DirEntry objects.
Anyway, where to from here? Are we agreed given the numbers that -- especially on Linux -- it makes good performance sense to use an all-C approach?