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Re: pitiful dav performance

From: Brandon Ehle <azverkan_at_yahoo.com>
Date: 2003-02-25 21:48:57 CET

Philip Martin wrote:

>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?
>
>
>
This is a known bug of using Apache2 with DB-4.0.14

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Received on Tue Feb 25 21:48:19 2003

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