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Re: [certi-dev] CERTI performance issue

From: Eric Noulard
Subject: Re: [certi-dev] CERTI performance issue
Date: Fri, 29 May 2009 12:59:50 +0200

2009/5/29 Pierre Siron <address@hidden>:
> Eric Noulard a écrit :
>> However this may be due to the time creep problem, I let Pierre
>> explain that for us.
> Hello,
> thank you for this task Eric,
> the time creep problem is well illustrated in this tutorial of Richard
> Fujimoto :
> "Parallel & Distributed Simulation Systems : From Chandy/Misra to the
> High Level Architecture and Beyond"
> and in his books.

The tutorial may be found there:

That link will give you overview ot time management too.

Or you can try  a search on

for example "HLA lookahead"
or "HLA Time Management"

will give you many valuable references

> The first generation of time management algorithms suffers of this problem.
> If the lookahead is small with regards to the time step of the
> nextEventRequest,
> a round of NULL messages (and ticks) is required before the
> timeAdvanceGrant.
> This is probably your case.
> For a good efficiency, the lookahead should be as great as possible.
> In the second generation, a global LBTS is computed after a global
> snapshot of the distributed simulation (which requires other messages).
> We have some ideas to add that in CERTI  and  I did not khnow what
> the RTI NG has implemented.

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