Bup: Efficient file backup system based on the git packfile format

Re:Bup: Efficient file backup system based on the git packfi... by apenwarr on Saturday February 15, 2014 @05:56PM (#7245836)

It's not too hard actually. A line of python is roughly 80x slower than a line of C (no exaggeration). But a typical line of python does a lot more than a typical line of C. So things you can do with a "loose" loop (like once per 64k block) is usually ok in python. Things you have to do with a "tight" loop (like once per byte) need to be in C.

I once did a presentation about python performance optimization lessons from bup: http://lanyrd.com/2011/pycodeconf/sghxk/

And it's true, I'm not the most active maintainer anymore. The people who took over seem to be doing a pretty good job though.

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Re:Bup: Efficient file backup system based on the git packfi... by tekacs on Saturday February 15, 2014 @06:59PM (#7246045)

I'd be curious to know if your stance on PyPy has changed at all since 2011 (if indeed it's something that you've taken any new long looks at since) given their progress in that time.

I know that I would humbly submit at the least that my position has moved to believing that PyPy is a viable option for high-speed code (albeit in substantial part due to better interaction with C, nowadays).

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