Hi Michael,
Are you sure the number of TICK_REQUEST messages between
federate and RTIA stayed the same? I would expect the number of federate TICK
requests is lower by several orders of magnitude.
Petr
From: address@hidden
[mailto:address@hidden On
Behalf Of Michael Raab
Sent: Tuesday, June 16, 2009 9:34 AM
To: CERTI development discussions
Subject: Re: Re: [certi-dev] CERTI performance issue
Hi all,
got the
information on our internal tick usage.
Internally
we've used the tick function without parameters, which resulted in the
discussed performance issues.
I did a test
using tick(min, max) and got a great performance boost.
Execution time
went down from 1200s to 51s, while the number of sent null messages and tick
requests stayed nearly the same.
Some ideas how
this is possible?
If this
perfomance stays the same in further tests, i think we can delay the
implementation of second generation time management techniques.
Regards,
Michael
Dipl.-Inf. Michael Raab
Fraunhofer-Institut für Fabrikbetrieb und -automatisierung IFF
Virtuell Interaktives Training
Sandtorstr. 22, 39106 Magdeburg, Germany
Telefon +49 (0) 391/ 40 90 122
Telefax +49 (0) 391/ 40 90 115
address@hidden
http://www.iff.fraunhofer.de oder http://www.vdtc.de
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05/29/2009
11:18 AM
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Re:
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2009/5/29 Michael Raab
<address@hidden>:
>
> Dear all,
>
> some more information from our side:
>
>> How long does this simulation run (elapse time)?
>
> approx. 1200 s
>
>> 3 federates: are they all tree time regulating and time
constrained?
>
> Yes!
>
>> Elapsed (Wall Clock) Time :
>
> What do you mean? We have no real time application like a flight simulator.
> We're using CERTI to connect some discrete event simulation systems,
> in this case three instances of SLX ( FYI http://www.wolverinesoftware.com/
> ).
Elapse Time you may read on the Wall Clock during your simulation run.
That's your 1200s.
That said, you have something like 158687 NULL message sent fro Fed2
which makes 158687/1200 = 132+ message per second.
This is really too much NULL messages.
However this may be due to the time creep problem, I let Pierre
explain that for us.
In the same way 85253/1200 = 71+ tick request per second, this is
sustainable
but seems exagerate.
>> We lack some network topology figures, do each federate run
[...]
>
> All three federates plus the rtig run on a single machine, which has 4
cores
> ( 2 opterons ) and is connected to 100Mb/s network.
Then all thoses federates may be ping-ponging themselves the
processing ressources.
With 3 federates plus rtig you have 7 processes (3 federates + 3 RTIA
+ 1 RTIG).
Is the average load of the machine high during the run or not?
>> Would you be able to update an rerun in order to see if recently
fixed bug
>> http://savannah.nongnu.org/bugs/?26610 improves this
situation.
>
> Can't check as savannah is down. I'm using the cvs checkout from
yesterday.
> Was this bugfix included?
Depends on the date of your update :-)
I will seek the date and send you the correspondinfg file.
Concerning Savannah outage sysadmin told us we cannot expect
restore until 24h.
"
Savannah experienced a filesystem corruption and is now halted.
The mailing lists and webpages are not affected by the outage.
The website, CVS/SVN/Git/Hg/Bzr, and the download area are affected."
>> Which version of tick are you using in your federate?
>
> Can't tell you at this moment as this is encapsulated in a wrapper
dll, for
> which i don't have the source. I will ask a partner later today.
Ok that would be good to know.
>> If your source code may be shared I may try to run the very same
setup
>> on a Linux config in order to see if I get similar figures.
>
> Btw, unfortunatly i'm not able to share the source and the SLX
simulation
> system is windows only.
Such a shame :-)
--
Erk
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