[Opensim-dev] Question about Threads Use in OpenSim ...

Wed Apr 9 16:19:49 UTC 2008

Hi Justin,

Yes, it was a freeze with 100% CPU ( on one core ) ... But, not using  
mono 1.9 at this time. When I upgrade to Mono 1.9, was much better :)

I'll continue my tests with SVN.4111 before trying the latest SVN  
release.

I'll let you know in a while.

Regards,

Ursula.

Le 9 avr. 08 à 18:14, Justin Clark-Casey a écrit :

> Is this a freeze with 100% cpu?  sdague has been having some mono-1.9
> issues in this area.
>
> Alternatively, I've also seen Wright Plaza on osgrid deadlock once  
> (with
> idling cpu levels), which might be something to do with people logging
> in to a specific location selected in the login screen (I'm a bit hazy
> on the details since I haven't chased this one up).
>
> --
> justincc
>
>
> Ursula MATOVA wrote:
>> Hi Stefan,
>>
>> Well, I'm now testing SVN.4111 and it seems to work better ...
>> Sometimes the Sim freeze, but most often in Standalone mode.
>>
>> For now, I can run OpenSim, with acceptable response time in 4x4  
>> Regions.
>>
>> And I had an Idea the past night :)
>>
>> I think the component that use too many CPU is the one that deal with
>> port 9000 ( mean something in OpenSim.exe ).
>>
>> Here is what I'm thinking that :
>>
>> As I mention in Mantis #909, I'm running OpenSim in Grid mode, 4x4
>> Regions, BUT, I have created 6 Virtual Servers with Xen.
>>
>> Linux Debian 4.0r3 Etch, Mono 1.9 /  Xen 3.1.0.
>>
>> Here is the Topology  :
>>
>> Dom0 ( 256Mo ) <-- Main Host ( Nothing on it except xen ),
>> DomU ( osg200 / 256MB Ram ) <-- Apache + MySQL ( Maybe Squid in the
>> future ),
>> DomU ( osg201 / 256MB Ram ) <-- OpenSim "U+G+A+I", ( Will update it  
>> to
>> 512MB Ram )
>> DomU ( osg203 / 512MB Ram ) <-- OpenSim "S" ( Region Server, 4  
>> Regions ),
>> DomU ( osg204 / 512MB Ram ) <-- OpenSim "S" ( Region Server, 4  
>> Regions ),
>> DomU ( osg205 / 512MB Ram ) <-- OpenSim "S" ( Region Server, 4  
>> Regions ),
>> DomU ( osg206 / 512MB Ram ) <-- OpenSim "S" ( Region Server, 4  
>> Regions ),
>>
>> The startup order is : osg200 > osg201 ( UGAI ) > osg203 (S) >  
>> osg204 ...
>>
>> While monitoring my firewall logs, I found that even if my avatar is
>> located in a region that belongs to OSG204( for example ) ... There
>> was Network Trafic to port 9000 ( OSG203 -- The first Region server I
>> started ).
>> And, while monitoring RAM/CPU Usage on my Virtual Servers, I have
>> noticed that OSG203 is in "High CPU usage" state ( much more that
>> OSG204, 205 or 206 )
>>
>> Of course I have to confirm all those points and drop you some
>> metrics. And I have some more tests to prove that. But it could be a
>> good start point for investigation.
>>
>> I'll make tests tonight and post the results there.
>>
>> Regards,
>>
>> Ursula.
>>
>> (( Ouch, my english turns bad :D Sorry. ))
>>
>>
>> Le 9 avr. 08 à 17:48, Stefan Andersson a écrit :
>>> What's the current status on the thread issues? Are we looking into
>>> it? Have we identified consumers/culprits?
>>>
>>> Best,
>>> /Stefan
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
>>>> From: ursula.matova at klintcentral.net
>>> <mailto:ursula.matova at klintcentral.net>
>>>> To: opensim-dev at lists.berlios.de <mailto:opensim-dev at lists.berlios.de 
>>>> >
>>>> Date: Sun, 17 Feb 2008 11:09:27 +0100
>>>> Subject: [Opensim-dev] Question about Threads Use in OpenSim ...
>>>>
>>>> Hi all,
>>>>
>>>> First, please be indulgent about my poor english :) You all know  
>>>> how
>>>> french people are bad with foreign languages ...
>>>> Thanks in advance.
>>>>
>>>> Well, I'm running OpenSim in StandAlone mode, 3x3 Regions ( as Grid
>>>> mode is so difficult to configure behind a firewall ) ...
>>>> Using a home made "Linux From Scratch" box with Mono 1.2.6 ( daily
>>>> snapshot ) ...
>>>> The computer is an Athlon64X2 4400+ with 4GB Ram ... ( is it large
>>>> enough ? )
>>>>
>>>> In the past ( before SVN.3335 or something ) when running OpenSim,
>>>> just after the simulator goes Up, the OpenSim.exe process use  
>>>> around
>>>> 96 threads and everything works fine,
>>>> But, now, I saw that this number of threads reach 118 :(
>>>> As I posted in the past in Mantis that Mono under Linux is really  
>>>> bad
>>>> ( performances & coredump ) when you reach the limit of 170  
>>>> threads ...
>>>>
>>>> When I connect 1 user to the sim : Thread count is now reaching :  
>>>> 157
>>>> When I connect a 2nd user to the sim : Thread count reach : 200
>>>> ( in that case : 200 threads used, the sim doesn't crash like in  
>>>> the
>>>> past but I find everything slow ... and my CPU is now 100% use / 7%
>>>> Ram used )
>>>>
>>>> Then, that mean, each time a user is connecting to the Sim, it use
>>>> about 40 threads ...
>>>> So, if I like to connect 20 users, I need around 40x20 threads =  
>>>> 800
>>>> threads ...
>>>> And I'm not sure at all that Mono could manage that :(
>>>>
>>>> What's you're feeling on that point ?
>>>>
>>>> So, my question is : why not forking a new "OpenSim.exe" process  
>>>> for
>>>> each new connected user ?
>>>> Of course it's mostly for the standalone mode ( but the problem  
>>>> is a
>>>> bit the same in Grid Mode ) ...
>>>>
>>>> Maybe it's a simple/stupid idea from me, because I haven't enough
>>>> development skills to help all the people working hard to bring up
>>>> this marvelous simulator.
>>>>
>>>> Please, just let me know your position about it.
>>>>
>>>> Thanks a lot guys for all your dev,
>>>>
>>>> Regards,
>>>>
>>>> Ursula Matova
>>>> ( Of course this is my S/L Avatar Name :) )
>>>>
>>>>
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