On Tue, Oct 15, 2013 at 07:49:57AM +0700, Nguyen Thai Ngoc Duy wrote:

> I see this as pack-objects peformance improvements only. If we could
> make pack-objects run like 10% faster (even only with -adf), then it
> may be worth trying. The 10% is a total guess though as I haven't
> checked how much time we spend in searching deltas.

For "repack -ad", generally we don't spend that much time on deltas. It
depends what your pre-repack state is, of course, but I find that most
of the time goes to "counting objects". With "-adf", I would guess that
we easily spend something like 95% of the time on compressing for a
large repository (just try "repack -adf" on the kernel; even with 8
cores it's a half hour or more on my machine, versus about 25 seconds to
count the objects).

So I think you could potentially get a lot of speedup for the "-adf"
case (and likewise "git gc --aggressive").

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