[Opensim-users] Help in CPU usage diagnosis, please

[Stefan Andersson]

There are some diagnostics commands like

 

show statistics

and

show queues

 

that could sometimes be instructional.


Also, you can monitor the regions with the Statistics module that resides on /SStats on the region http server (if my memory serve me right)

Best regards,
Stefan Andersson
Tribal Media AB



 
> To: opensim-users at lists.berlios.de
> From: opensim at jfhopkin.karoo.co.uk
> Date: Thu, 12 Feb 2009 19:07:21 +0000
> Subject: [Opensim-users] Help in CPU usage diagnosis, please
> 
> I've noticed the past couple of builds I've used have sometimes make
> heavy use of the CPU even when idle. For example, today, after
> leaving the system idle overnight, the two virtual CPUs (a single-core
> Pentium 4) were running constantly at 96-99% each, whereas normally
> I'd expect 35-40% and 12-15% during idle running, most of that
> non-Opensim overhead.
> 
> When this happens, sometimes - but not always - a reload of the server
> fixes it. I'm only running a single OpenSim.exe, and using OSGrid's
> UGAIM.
> 
> This is noticeable in-world as lag, and I'd like to find out what's
> causing it, but I don't know how to narrow it down, other than by
> eliminating various regions and also disabling services such as
> scripting and prim physics. With five regions, and more on the way,
> it's pretty difficult to eliminate anything that way, especially with
> something that's intermittent like this.
> 
> It strikes me that I know very little of what I, as a user, can do to
> try to diagnose something like this. I'd like to have more details
> before I file a Mantis, since a description alone can't really be much
> use to the devs. The steps I could take with what knowledge I have
> are:
> 
> 1. Examine OpenSim.log and look for anything suspicious-looking,
> especially if it's happening repeatedly. Do the same with the
> on-screen messages (difficult, since the virtual console only scrolls
> back so far).
> 
> 2. Look at other vital signs, such as network use and free memory -
> in this case, these are normal. In fact, at 33-38% user memory used
> of 2GB for four regions, that's better lately than it's been for a
> long time.
> 
> 3. Selectively disable various regions and services, as mentioned
> above, and monitor the situation over time. This is difficult, as it
> naturally affects our use of the sim in the meantime.
> 
> 4. Make sure that it is the OpenSim.exe process that's causing it by
> using "ps" (in *nix) and similar tools to examine the process. (It
> is).
> 
> What else can I do, in general terms? What debugging tools and
> techniques can a user with little direct experience of OS's internal
> machinations use to help pinpoint a problem? Is there any way of
> finding out the resource usage of, say, individual modules? Of
> getting more detailed logs? Anything?
> 
> Please note that the actual problem I'm having at the moment is only
> an example - I'm interested in general in being able to be more
> proactive in diagnosing Opensim problems, knowing as a developer
> myself (though not in this project) how valuable more detail from
> users can be in tacking a problem.
> -- 
> John Hopkin
> 
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