Re: [PATCH] git exproll: steps to tackle gc aggression

From: Duy Nguyen <pclouds@gmail.com>
To: Martin Fick <mfick@codeaurora.org>
Cc: Git List <git@vger.kernel.org>,
	Ramkumar Ramachandra <artagnon@gmail.com>
Subject: Re: [PATCH] git exproll: steps to tackle gc aggression
Date: Tue, 6 Aug 2013 19:24:50 +0700	[thread overview]
Message-ID: <CACsJy8CGWJ07Uk8EBjfejdyshKB1NKk=_7VUoeyZWZgJFqCSkg@mail.gmail.com> (raw)
In-Reply-To: <1375756727-1275-1-git-send-email-artagnon@gmail.com>

On Tue, Aug 6, 2013 at 9:38 AM, Ramkumar Ramachandra <artagnon@gmail.com> wrote:
> +               Garbage collect using a pseudo logarithmic packfile maintenance
> +               approach.  This approach attempts to minimize packfile churn
> +               by keeping several generations of varying sized packfiles around
> +               and only consolidating packfiles (or loose objects) which are
> +               either new packfiles, or packfiles close to the same size as
> +               another packfile.

I wonder if a simpler approach may be nearly efficient as this one:
keep the largest pack out, repack the rest at fetch/push time so there
are at most 2 packs at a time. Or we we could do the repack at 'gc
--auto' time, but with lower pack threshold (about 10 or so). When the
second pack is as big as, say half the size of the first, merge them
into one at "gc --auto" time. This can be easily implemented in
git-repack.sh.
-- 
Duy