On Thu, Oct 27, 2011 at 23:01, Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx> wrote:
> I haven't dug into why this is but I'm pretty sure it's because this
> patch makes Git behave pathologically on repositories with a large
> amount of tags. git.git itself has ~27k revs / and ~450 tags, or a tag
> every ~60 revisions.
>
> Try it on e.g. a repository with a couple of hundred thousand revs and
> a tag every 10-20 revisions.
Actually it just seems slow in general, not just on repositories with
a lot of tags, on linux-2.6.git with this patch:
$ time ~/g/git/git-pack-objects --keep-true-parents
--honor-pack-keep --non-empty --all --reflog
--delta-base-offs</dev/null
/home/avar/g/linux-2.6/.git/objects/pack/.tmp-pack
Counting objects: 2184059, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (338780/338780), done.
130605d5b82492a38452b9bc7bddfb4a6ef0e942
Writing objects: 100% (2184059/2184059), done.
Total 2184059 (delta 1825129), reused 2184059 (delta 1825129)
real 1m28.426s
user 1m19.661s
sys 0m3.008s
With it reverted:
$ time ~/g/git/git-pack-objects --keep-true-parents
--honor-pack-keep --non-empty --all --reflog --delta-base-offset
</dev/null /home/avar/g/linux-2.6/.git/objects/pack/.tmp-pack
Counting objects: 2184059, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (338780/338780), done.
130605d5b82492a38452b9bc7bddfb4a6ef0e942
Writing objects: 100% (2184059/2184059), done.
Total 2184059 (delta 1825129), reused 2184059 (delta 1825129)
real 0m50.152s
user 0m45.367s
sys 0m2.920s
And if you create a lot of tags:
git log --pretty=%h | perl -lne 'chomp(my $sha = <>); print $sha
if $i++ % 10 == 0' | parallel "git tag test-tag-{} {}"
Resulting in:
$ git rev-list HEAD | wc -l
269514
$ git tag -l | wc -l
13733
This'll be the time with this patch reverted, i.e. almost exactly the
same as with just ~250 tags:
real 0m52.860s
user 0m44.907s
sys 0m3.172s
And with it applied, i.e. almost exactly the same as with just ~250
tags:
real 1m29.080s
user 1m21.825s
sys 0m3.096s
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