Re: [SOSlib-devel] [Fwd: SOSlib progress on AIX / parallel support?]

[Rainer M. <ra...@tb...>]

Dear Eric,

I have forwarded your email to the developer email list, as others might 
be interested or have ideas on your remaining AIX problems.

 > very strangely, static int memoryExhaustion = 0; in solverError.c is not
 > initialized on AIX (on Linux it works fine),

mhm... strange. Can you (or anyone else) think of a workaround to 
initialize this global variable to 0?
We don't get any warning about this, so it seems to be ISO-C90/ANSI-C 
compatible.

 > Also, I found that only the serial versions of Sundials libraries are
 > used. My aim is now to convert cvodeSolver.c and odeModel.c to use
 > nvector_parallel.h

I also haven't looked at the details of the parallel solvers in SUNDIALS.

However, when looking at the examples given by SUNDIALS I remember that 
I had the impression that it might require to somehow parallelize the 
ODE system itself!

This might be very difficult with our approach of arbitraty ODE models. 
But maybe I am wrong. It would be great if you could have a look at 
that! Generally, the SUNDIALS email list is very responsive and helpful. 
But we should try to find out what we can before contacting them.

 >if
 > that is successful, I'll happily share the adaptation with you.

That would of course be a great contribution!

BTW, we also need to fully implement the online TCC-based compilation of 
all right-hand-side functions. Andrew had implemented that on Windows 
and it didn't work out-of-the-box on our Linux systems here. We never 
had a look at it, but I think it will be probably be rather easy to 
implement it generally, based on optional SOSlib compilation linking to 
the TCC library.

Rainer



Rainer Machne wrote:
> 
> -------- Original Message --------
> Subject: SOSlib progress on AIX / parallel support?
> Date: Wed, 21 Mar 2007 16:28:11 -0000
> From: Eric Fernandez <efe...@ph...>
> To: Rainer Machne <ra...@tb...>
> 
> Dear Rainer,
> 
> I hope you are well and that you enjoyed your holidays.
> 
> I contacted you a couple of weeks ago about SOSlib that I wanted to
> install on an AIX server. I finally managed to do it, thanks to a
> debugging session. For some reason, the conversion of models from Level
> 1 to Level 2 does not work, because of some issue with libsbml. Also,
> very strangely, static int memoryExhaustion = 0; in solverError.c is not
> initialized on AIX (on Linux it works fine), although compiled with gcc
> 3.3.2, and of course leaded to the software stopping. Maybe a bug in
> gcc-3.3.2 ? I had to deactivate the memory checks (I know, it's bad)
> meanwhile.
> 
> Also, I found that only the serial versions of Sundials libraries are
> used. My aim is now to convert cvodeSolver.c and odeModel.c to use
> nvector_parallel.h instead (and doing the adjustments for parallel
> processing). I was wondering, have you already done this ? According to
> my understanding of SOSlib, this should be possible and should not
> interfere with events, as events are tested and triggered after each ODE
> solving time step. However I admit I walk in the dark there. Anyway, if
> that is successful, I'll happily share the adaptation with you.
> 
> Kind regards,
> 
> Dr Eric Fernandez
> Senior Simulation Scientist
> Physiomics plc
> The Magdalen Centre
> The Oxford Science Park
> Oxford
> OX4 4GA
> UK
> Tel: +44(0)1865 784986
> 
> 
> -------------------------------------------------------------------------
> Take Surveys. Earn Cash. Influence the Future of IT
> Join SourceForge.net's Techsay panel and you'll get the chance to share your
> opinions on IT & business topics through brief surveys-and earn cash
> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
> _______________________________________________
> sbmlsolver-devel mailing list
> sbm...@li...
> https://lists.sourceforge.net/lists/listinfo/sbmlsolver-devel