Re: Git benchmarks at OpenOffice.org wiki
- From
Robin Rosenberg <robin.rosenberg.lists@dewire.com>
- Date
- May 3, 2007, 10:16 UTC
- Message-ID
- <200705031216.19817.robin.rosenberg.lists@dewire.com>
- In-Reply-To
- <Pine.LNX.4.64.0705031131410.4015@racer.site>
torsdag 03 maj 2007 skrev Johannes Schindelin:
Show 18 quoted lines
> Hi, > > On Thu, 3 May 2007, Florian Weimer wrote: > > > * Jakub Narebski: > > > > > What I'm really concerned about is branch switch and merging branches, > > > when one of the branches is an old one (e.g. unxsplash branch), which > > > takes 3min (!) according to the benchmark. 13-25sec for commit is also > > > bit long, but BRANCH SWITCHING which takes 3 MINUTES!? > > > > IIRC, GIT accesses every file in the tree, not just the ones that need > > updating. How many files were actually updated when you changed > > branches in your experiment? > > No. Git does not access every file, but rather all stats. That is a huge > difference. And it should not take _that_ long for ~64000 files. Granted, > it will cause a substantial delay, but not in the range of minutes.
It's worse... On my laptop the switch took ~ten minutes, not three. A diff --stat takes over six minutes!! For reference, dd:in the pack file with my disk takes ~50 seconds.
The reason is simple. I have a lousy one gigabyte RAM only, while git wants 1.7GB virtual to do the diff-stat. and 800 MB resident. The swap is having a party,
$ vmstat 1 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 2 1861632 14108 428 126816 70 347 605 647 594 1041 11 2 74 13 0 2 1861204 12096 420 125724 3096 8 3096 24 625 1171 5 1 0 94 0 2 1860896 18972 404 115836 3524 292 3524 292 671 1474 7 4 0 89 0 2 1860820 18668 364 113736 3556 784 3556 784 669 1384 7 5 0 88 0 3 1860420 19692 300 109904 3008 180 3156 180 684 1325 8 5 0 87 0 3 1860184 18560 300 108596 3316 232 3396 232 643 1246 8 4 0 88 0 2 1859856 21808 292 103744 2108 32 2356 32 637 1319 9 1 0 90
-- robin