[cvsnt] Re: Strange CVS performance fluctuation

Tony Hoyle tony.hoyle at march-hare.com
Tue Jun 20 15:51:59 BST 2006

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Tobias Rodenbach wrote:
> Hello,
> I observed the following strange behaviour, when "many" people tried
> to access our cvs server (I counted about 35 instances of cvs.exe).
> Then, the CPU usage history of the Windows Task Manager shows that CPU
> Usage goes to about 50% for about 10 seconds, then drops to below 3%
> for about 10 seconds, rises to about 50% for 10 seconds and so on...
> Sometimes CPU usage stays high or low for more than 10 sec but most of
> the time it alternates in the 10 second scheme.
> In general, the performance is very low. Checking out using a tag
> (which is the most common case here) can take up to one hour for
> around 6 MB in the local LAN. ("Normally" that takes significantly
> less than one minute.)
> The host is a Win2003 server with 2 hyperthreading CPUs, the cvsnt
> server is version 2.5.02 build 2115.
> Does anyone have any idea what could be the reason for this behaviour?

Sounds like either the network performance is fluctuating or your disk 
is not handling the contention well.

I would expect 35 instances of cvs.exe to be using 100% pretty much all 
the time (although they wouldn't get much each).

Make sure you've uninstalled any firewall/AV products before running any 
tests - AV in particular can murder the performane of the server (in the 
order of 20-100* slower).


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