From: Ingo Molnar <mingo@elte.hu>
To: "Shawn O. Pearce" <spearce@spearce.org>
Cc: git@vger.kernel.org
Subject: Re: q: git-fetch a tad slow?
Date: Thu, 31 Jul 2008 23:11:41 +0200 [thread overview]
Message-ID: <20080731211141.GA1159@elte.hu> (raw)
In-Reply-To: <20080731210307.GF25138@elte.hu>
* Ingo Molnar <mingo@elte.hu> wrote:
> > for strictly local fetch. If your SSH overhead is ~300 ms this is
> > only a ~700 ms real time for `git fetch origin`, not 5100 ms.
> >
> > Is your git-fetch a shell script? Or a compiled binary? The port
> > into C made it go _much_ faster, even though it is still a naive
> > O(N^2) matching algorithm. Yea, we still should fix that, but I
> > think an upgrade to 1.5.4 or later would make the client side
> > improve consideribly.
>
> ah, it is a shell script indeed! I'll upgrade to latest.
on another box, with 1.5.4, i have:
dione:~/tip> time git fetch origin
real 0m0.481s
user 0m0.136s
sys 0m0.060s
dione:~/tip> time ./tip-fetch
b714d1a257cca93ba6422ca3276ac80a2cde2b59
b714d1a257cca93ba6422ca3276ac80a2cde2b59
real 0m0.273s
user 0m0.012s
sys 0m0.020s
that's a 2.66 GHz core2 quad, i.e. a pretty fast box too. As you can see
most time spent in the tip-fetch case was waiting for the network. So
there's about 200 msecs of extra CPU cost on the local side. On a CPU
1-2 generations older that could be up to 1000 msecs or more.
In any case, performance has improved significantly with the C version!
(I'll still use tip-fetch to squeeze out the last bit of performance,
but it's quite comparable now.)
Sorry that i didnt notice that titan had 1.5.2 - i almost never notice
it when i switch between stable git versions. (you guys are doing a
really good job on compatibility)
Ingo
next prev parent reply other threads:[~2008-07-31 21:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-28 16:01 q: git-fetch a tad slow? Ingo Molnar
2008-07-29 5:50 ` Shawn O. Pearce
2008-07-29 9:08 ` Ingo Molnar
2008-07-30 4:48 ` Shawn O. Pearce
2008-07-30 19:06 ` Ingo Molnar
2008-07-30 22:38 ` Shawn O. Pearce
2008-07-31 4:45 ` Shawn O. Pearce
2008-07-31 21:03 ` Ingo Molnar
2008-07-31 21:11 ` Ingo Molnar [this message]
2008-07-31 21:19 ` Shawn O. Pearce
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