From: Ingo Molnar <mingo@elte.hu>
Date: Tue, 29 Jul 2008 09:08:02 GMT
Subject: Re: q: git-fetch a tad slow?
Message-ID: <20080729090802.GA11373@elte.hu>
In-Reply-To: <20080729055014.GE11947@spearce.org>


* Shawn O. Pearce <spearce@spearce.org> wrote:

> Ingo Molnar <mingo@elte.hu> wrote:
> > 
> > Setup/background: distributed kernel testing cluster, [...]
> > 
> > Problem: i noticed that git-fetch is a tad slow:
> > 
> >   titan:~/tip> time git-fetch
> >   real    0m2.372s

> Also, I wonder if you really need to fetch over SSH.  Doing a fetch 
> over git:// is much quicker, as there is no SSH session setup 
> overheads.

note that titan is a very beefy box, almost 3 GHz Core2Duo:

   model name      : Intel(R) Core(TM)2 CPU         E6800  @ 2.93GHz
   stepping        : 5
   cpu MHz         : 2933.331

server is 3 GHz. So if we have a quadratic overhead on number of 
branches, that's going to be quite a PITA.

> I wonder if git-pack-refs + fetching only a single branch will get you 
> closer to the tip-fetch time.

should i pack on both repos? I dont explicitly pack anything, but on the 
server it goes into regular gc runs. (which will pack most stuff, 
right?)

	Ingo