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List: git
Subject: Re: When to repack?
From: "Shawn O. Pearce" <spearce () spearce ! org>
Date: 2007-01-31 15:36:47
Message-ID: 20070131153647.GA21888 () spearce ! org
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Johannes Schindelin <Johannes.Schindelin@gmx.de> wrote:
> On Wed, 31 Jan 2007, Andreas Ericsson wrote:
> > Bill Lear wrote:
> > > We have a company repo used by many people throughout the day. When/how
> > > can I repack this? I have come to adopt this approach:
>
> AFAIR this case is handled gracefully by git. If the object it is still
> accessing moves to a(nother) pack, git will still find it.
No AFAIR, its definately true. `git gc` is completely safe on a
live repository. Run it at will. Toss it in a cronjob. Whatever.
What is *not* safe is `git gc --prune`. Don't run that on an
active repository.
> > On a side-note, this is a grade A example of something that should
> > typically be done sunday night at 4am.
Possibly. Almost doesn't matter when you run it, except on very huge
repositories where the repack would take more than a few minutes.
Really, just toss something like the following in a cronjob that
runs once a week:
#!/bin/sh
for g in /path/to/gits/*.git
do
git --git-dir="$g" gc
done
If you want to get fancy, use the output of `git count-objects -v`:
count: 325
size: 2332
in-pack: 40894
packs: 1
prune-packable: 0
garbage: 0
I look for a count over 2000 or packs over 5. If either is true,
I run gc, otherwise I skip that repository and leave it alone
that week. And that's actually packing more frequently than I
really need to. On any UNIX system you can probably let those go
to >5,000 or 20 and still not really see a performance problem.
In general, repacks and network transfers (or basically any
operation) takes longer as the number of loose objects increases
(that's the count field in `git count-objects -v`). Keep below
~2000 and `git gc` times tend to be measured in just a minute or
two for even 200 MiB repositories.
--
Shawn.
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