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Re: [Gnu-arch-users] tla library-add - high cpu

From: Andrew Suffield
Subject: Re: [Gnu-arch-users] tla library-add - high cpu
Date: Fri, 5 Sep 2003 10:43:23 +0100
User-agent: Mutt/1.5.4i

On Fri, Sep 05, 2003 at 08:40:15AM +1000, Robert Collins wrote:
>       tla library-add seems to spend most of it's time thinking, not patching
> or retrieving. 
> For instance, in a recent tla library-add
> address@hidden/squid--HEAD--3.0 (~400 patches), into a
> clean revision library, tla took ~15 seconds to get back to the start
> and do the first patch. After that though, it spends quite some time
> doing nothing obvious, and top shows tla at 100% cpu.
> The archive was being accessed via sftp. It's possibly a retrieval code
> problem - or a logic problem of some sort. It's spending 30-40 seconds
> per patch, and those patches can be grabbed by sftp in about 2 seconds,
> so I suspect a bad O somewhere in tla itself.

I believe it's actually a wait-for-ack problem - library-add
repeatedly fires off a request, and sits waiting for a response,
instead of pipelining. So latency kills you.

  .''`.  ** Debian GNU/Linux ** | Andrew Suffield
 : :' : |
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