[Kde-scm-interest] Re: Trial run of the kdelibs git

[Ian Monroe]

2010/12/6 Boyd Stephen Smith Jr. <bss at iguanasuicide.net>:
> In <AANLkTim2sGNhhsJekbMH7ewhORmFRiD+gv4P0rhYOkzS at mail.gmail.com>, Ian Monroe
> wrote:
>>2010/12/6 Thiago Macieira <thiago at kde.org>:
>>> git-fast-import produces very poorly-packed repositories. Repacking is a
>>> must to reduce the size.
>>
>>git gc --aggressive seem to do a great job. repacking on top of it...
>>not so much.
>
> From git-gc(1):
> If the number of loose objects
> exceeds the value of the gc.auto configuration variable, then all
> loose objects are combined into a single pack using git repack -d
> -l.
> ...
> If the number of packs exceeds the value of gc.autopacklimit, then
> existing packs (except those marked with a .keep file) are
> consolidated into a single pack by using the -A option of git
> repack.
> ...
> The optional configuration variable gc.aggressiveWindow controls how
> much time is spent optimizing the delta compression of the objects in
> the repository when the --aggressive option is specified. The larger
> the value, the more time is spent optimizing the delta compression. See
> the documentation for the --window' option in git-repack(1) for more
> details. This defaults to 250.
>
> git gc --aggressive spends most of its time in git repack calls.  Still, using
> higher depth and/or window should shrink the packs and using lower depth
> and/or window should grow the packs.

The growth of Calligra from 366 to 600 was apparently because of
killing the repack process since it was running on a machine with not
enough memory. So that was unfair to blame repack for that.

But I really did it see it complete successfully on my machine and it
growing from 366 to 400.

It doesn't surprise me that gc --aggressive does a lot repacking. Jeff
did some testing and was only able to get that 366 to 365 with repack
on a repo that had had git gc --aggressive.

So given all that, for me, I'll let the pros who developed 'gc' handle
running the repack command. :)

Ian