edx/edx-platform — pull request #3097 by davestgermain (2014-03-28 04:26:32+00:00)
Title: Reduce false cache misses when evaluating prerequisites

The previous function was building a hash of the list of every single file in the site-packages directory, effectively making every execution a cache-miss and slowing down server startup. I think it's reasonable to hash the contents of the requirements files and just the modification times of the modules under site-packages (even that is probably not necessary)

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