[allura:tickets] #6801 Options to parallelize last_commit_ids

[Dave Brondsema <br...@users.sf.net>]

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** [tickets:#6801] Options to parallelize last_commit_ids**

**Status:** open
**Labels:** performance 
**Created:** Sat Oct 26, 2013 04:22 AM UTC by Dave Brondsema
**Last Updated:** Sat Oct 26, 2013 04:22 AM UTC
**Owner:** nobody

For faster `last_commit_ids` processing, we should run N `git log` commands in parallel.  We may want to require minimum number of files/dirs before running in parallel if there is significant enough overhead in spinning up new threads.  (See runtests.py for an example of a threadpool running external commands)

This will largely remove the benefit of the current iterative approach, which can short-circuit some commands if files/dirs have the same last commit.  We can try to keep some of it, though, for cases where the parallelism is less than the total number of files/dirs.


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