Re: Git and GCC

From: David Miller <davem@davemloft.net>
Date: Dec 7, 2007, 03:31 UTC
Message-ID: <20071206.193121.40404287.davem@davemloft.net>
In-Reply-To: <20071206173946.GA10845@sigill.intra.peff.net>

From: Jeff King <peff@peff.net>
Date: Thu, 6 Dec 2007 12:39:47 -0500

Show 16 quoted lines

> I tried the threaded repack with pack.threads = 3 on a dual-processor
> machine, and got:
> 
>   time git repack -a -d -f --window=250 --depth=250
> 
>   real    309m59.849s
>   user    377m43.948s
>   sys     8m23.319s
> 
>   -r--r--r-- 1 peff peff  28570088 2007-12-06 10:11 pack-1fa336f33126d762988ed6fc3f44ecbe0209da3c.idx
>   -r--r--r-- 1 peff peff 339922573 2007-12-06 10:11 pack-1fa336f33126d762988ed6fc3f44ecbe0209da3c.pack
> 
> So it is about 5% bigger. What is really disappointing is that we saved
> only about 20% of the time. I didn't sit around watching the stages, but
> my guess is that we spent a long time in the single threaded "writing
> objects" stage with a thrashing delta cache.

If someone can give me a good way to run this test case I can have my 64-cpu Niagara-2 box crunch on this and see how fast it goes and how much larger the resulting pack file is.