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List: git
Subject: Re: q: git-fetch a tad slow?
From: "Shawn O. Pearce" <spearce () spearce ! org>
Date: 2008-07-31 21:19:19
Message-ID: 20080731211919.GC24631 () spearce ! org
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Ingo Molnar <mingo@elte.hu> wrote:
>
> 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.
Yea. My testing last night was suggesting about 1/2 of that 200
ms is on the client, and the other 200 ms is on the server side
of the connection. That matches up somewhat with your test above,
where git-fetch used about 100 ms more user time on the client side
than your tip-fetch shell script.
I have no clue where the bottleneck is, I didn't get that far before
I realized you must have been running a shell script based git-fetch
to be seeing the performance you were.
Maybe 1.6.1 or .2 we can try to squeeze fetch to run faster.
Its far too late for 1.6.0.
> 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)
Yea, its easy to not realize your git isn't giving you the latest
and greatest toys. ;-)
--
Shawn.
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