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Re: pitiful dav performance

From: Philip Martin <philip_at_codematters.co.uk>
Date: 2003-02-25 21:36:39 CET

seanc@dimensionalrift.com writes:

> > There are some known ra_dav performance issues, issue 773 in
> > particular. The first thing to determine is whether the problem is
> > excessive CPU use or whether it is some sort of IO problem.
>
> apache2 accumulated cpu time from a clean start and svn checkout, is
> listed as 9 seconds. Watching with top, the active apache2 thread sits
> around 1.8-3.8% cpu usage (which matches the 20x speed difference I am
> seeing between ra_svn and ra_dav), and every now and then I catch its cpu
> spiking up to 10% (very rare though). Memory is pretty low, with an
> occasional spike up to 20MB.

OK, that's not issue 773.

I suppose you could try using strace to identify what Apache is doing.
Run a checkout and use top to identify the active thread attach, then
use something like "strace -Tp <pid>" to see how much time each system
call takes. I'm assuming that it must be blocking in a system call as
it's not using CPU, but I'm not an Apache expert so I may be talking
rubbish!

Which Apache MPM are you using? Can you try a different one?

-- 
Philip Martin
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Received on Tue Feb 25 21:37:24 2003

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