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

1 messages from 2007-07-17 to 2007-07-17. Participants: Marco Costalba.
Thread: https://gitlist.dev/t/9078

## Marco Costalba, 2007-07-17 19:13

Subject: git-log: --topo-order speed-ups the thing !?
Message-ID: <e5bfff550707171213m5969e436yf4db83c44a1c8c42@mail.gmail.com>
URL: https://gitlist.dev/e/e5bfff550707171213m5969e436yf4db83c44a1c8c42%40mail.gmail.com

```
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

```