Re: pack operation is thrashing my server

From: Ken Pratt <ken@kenpratt.net>
Date: Aug 11, 2008, 07:43 UTC
Message-ID: <a6b6acf60808110043t76dc0ae6l428c5da473d79c71@mail.gmail.com>
In-Reply-To: <20080811030444.GC27195@spearce.org>

Show 16 quoted lines

> Have you tried something like this?
>
>        [core]
>                packedGitWindowSize = 16m
>                packedGitLimit = 64m
>
>        [pack]
>                threads = 1
>                windowMemory = 64m
>                deltaCacheSize = 1m
>
> On a 64 bit system packedGitWindowSize and packedGitLimit have very
> large thresholds which will cause it to mmap in the entire pack file.
> You may need to try even smaller settings than these; 256m physical
> memory isn't a lot when dealing with a repository 180m in size.
> Especially on a 64 bit system.

I just went as low as:

[core]
        packedGitWindowSize = 1m
        packedGitLimit = 4m
[pack]
        threads = 1
        windowMemory = 4m
        deltaCacheSize = 128k

And it didn't make a dent in memory usage. Server is still swapping within ~10 seconds of starting object compression.

I'm starting to think repacking is just not feasible on a 64-bit server with 256MB of RAM (which is a very popular configuration in the VPS market).

Thanks!

Ken