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git-log: --topo-order speed-ups the thing !?

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From: Marco Costalba <mcostalba@...>
To: Git Mailing List <git@...>
Subject: git-log: --topo-order speed-ups the thing !?
Date: Tuesday, July 17, 2007 - 3:13 pm

Testing with git log performance on Linux tree I found this
interesting and unexpected result:

$ time git log --parents --boundary --pretty=raw -z --log-size
--topo-order HEAD > /dev/null
6.85user 0.20system 0:07.05elapsed 100%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+21142minor)pagefaults 0swaps

$ time git log --parents --boundary --pretty=raw -z --log-size HEAD > /dev/null
7.01user 0.09system 0:07.10elapsed 100%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+11128minor)pagefaults 0swaps

Although page faults are more or less the half, execution time is
faster _with_ --topo-order option.

Someone could explain why?

Thanks
Marco
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git-log: --topo-order speed-ups the thing !?, Marco Costalba, (Tue Jul 17, 3:13 pm)