[Opensim-dev] Issues with the Simulator under high load

[Akira Sonoda]

Hi Justin,  I'll have a look and will report as soon as i get some results
.. and hopefully i get more insight. Interesting findings from Dahlia as
well !!

Here's my report from the last party:
https://docs.google.com/open?id=0B301xueh1kxda0hfNEpfWERRTWFzcnRjVGNELXowZw

Looking forward to the next parties !!!

Thank you so much Justin and Dahlia for your attention. Yes it is a
challenge especially in a mono environment, where a lot of the
monitoring/profiling tools are misseing. But that's the challenge and I am
more than willing to provide hopefully usable information if i can.


Am 17. März 2012 04:36 schrieb Justin Clark-Casey <jjustincc at googlemail.com>
:

> Hi Akira.  I have now updated the "show threads" method to show threadpool
> statistics for the main threadpool.  Please note that each XEngine script
> engine will also have it's own threadpool (which can be seen using the
> "xengine status" command).  Might need to improve this further.
>
> "show threads" will also show all in-use threads.  However, at least on
> mono 2.6.7 this isn't reported by the VM so won't be shown.
>
> I'm not sure whether this will help you or not in tracking down
> performance issues.  In some situations it could help (e.g. if threads are
> encountering deadlock the number of 'in use' threads will leap up, though
> you've probably already noticed deadlock by the long-running threads
> reporting monitoring failures and the sim locking up).
>
> So I'd be happy to hear suggestions for additional data and I'll implement
> them if I can, since I think this is going to be a growing area of concern.
>  Unfortunately pinning down performance issues with a system as complex as
> OpenSimulator (with massive numbers of threads and user generated scripts)
> is likely to remain a significant challenge for the forseeable future.
>
>
> On 11/03/12 19:15, Akira Sonoda wrote:
>
>> Am 10. März 2012 03:25 schrieb Justin Clark-Casey <
>> jjustincc at googlemail.com <mailto:jjustincc at googlemail.**com<jjustincc at googlemail.com>
>> >>:
>>
>>
>>    I'm sorry to say that you'll have to take the ThreadPool numbers with
>> a very very very large pinch of salt.  I
>>    believe they only refer to the built-in mono thread pool and not the
>> SmartThreadPool which is the one actually used
>>    (and beyond that the core simulator and xengine use separate pools).
>>  I will try and improve this situation soon.
>>
>>
>> Thank you Justin!
>>
>> Would be nice to have some meaningful statistics for all those
>> ThreadPools! Maybe there is a possibility to write those
>> statistics to the log from time to time ( e.g. every 30 seconds).
>> Together with some documented "best practices" from
>> those who operate Sims, with lots of avatars on it - I'm thinking mainly
>> the OSgrid Plazas are good references - this
>> could be highly valuable information for those who operate Sims for
>> similar purposes ( meeting points, parties, concerts
>> etc. )
>>
>>
>>
>>
>>
>>
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>
>
> --
> Justin Clark-Casey (justincc)
> http://justincc.org/blog
> http://twitter.com/justincc
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