Hi,
I'm having poor git gc (pack-object) performance. Please read below
for details. What can I do to improve the performance/debug the reason
for the slowness? Should I leave the process running over night, or
should I stop it (for debugging)?
CCing people who posted some patches/benchmarks for pack-objects recently.
git gc was first run automatically by git svn clone. It found 1544673
objects and worked for 50 minutes until I've killed it.
Then I've run it by hand with --aggresive (because I've found on
Internet it helped in some cases). It found 1742200 objects this time.
At this moment it's been working for about 90 minutes.
The large number of unpacked objects is probably caused by me - I've
disabled auto gc when I was cloning from svn (I though it might speed
up things if it didn't repack several times during clone, only once
afterwards).
My git version is 1.7.7.rc3.4.g8d714
The file system is ext4.
First run process tree:
pkruk 27873 0.0 0.0 15704 816 pts/2 S+ 11:53 0:00
| | \_ git gc --auto
pkruk 27885 0.0 0.0 15704 776 pts/2 S+ 11:53 0:00
| | \_ git repack -d -l
pkruk 27886 0.0 0.0 4220 608 pts/2 S+ 11:53 0:00
| | \_ /bin/sh
/usr/local/stow/git-master/libexec/git-core/git-repack -d -l
pkruk 27897 3.6 9.3 1136072 381148 pts/2 D+ 11:53 5:51
| | \_ git
pack-objects --keep-true-parents --honor-pack-keep --non-empty --all
--reflog --unpacked --incremental --local --delta-base-offset
/home/pkruk/dv/devel1_git_repos/.git/objects/pack/.tmp-27886-pack
Second run process tree:
pkruk 6171 0.0 0.0 15704 1428 pts/2 S+ 14:34 0:00
| | \_ git gc --aggressive
pkruk 6174 0.0 0.0 15704 1356 pts/2 S+ 14:34 0:00
| | \_ git repack -d -l -f
--depth=250 --window=250 -A
pkruk 6175 0.0 0.0 4220 648 pts/2 S+ 14:34 0:00
| | \_ /bin/sh
/usr/local/stow/git-master/libexec/git-core/git-repack -d -l -f
--depth=250 --window=250 -A
pkruk 6189 4.9 10.5 1143640 427396 pts/2 D+ 14:34 4:50
| | \_ git pack-objects
--keep-true-parents --honor-pack-keep --non-empty --all --reflog
--unpack-unreachable --local --no-reuse-delta --depth=250 --window=250
--delta-base-offset
/home/pkruk/dv/devel1_git_repos/.git/objects/pack/.tmp-6175-pack
--
Piotr Krukowiecki
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