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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Multiple Parameters Sweep - Memory Problems

Posted 2012年2月23日 GMT-5 12:12 Studies & Solvers Version 4.2a 2 Replies

Fabien
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Dear Community Members,

During the last months I have developed a comsol model that works very well for any combination of parameters, and now that it works, I would like to analyze the behavior for various combinations of 3 parameters. To this end, I am using a triple parametric sweep, and this is where problem appear.

I would like the program to go in a triple loop and solve for all parameters as it supposed to do. In my sense, the program should solve for one combination of parameters, store the solution to the hard drive, free the RAM and solve for the next combination of parameters, in a serial way. However whenever I increase the number of element in the parameter list I end up getting memory problems.

The computation works for any combination entered separately but not when using the parametric sweep with the number of parameters I want. I tried increasing the Java Heap Size and de-activating the option 'extension' -> 'use parametric solver', but this did not really help.

The only way I managed to do it so far is to reduce the number of parameters until I don't have memory problems, and use duplicates of the file with the remaining parameters I am interested in, which is really annoying (trial and error approach and increasing number of files I have to sort).

Does anyone know a way to circumvent these problems?

Thanks for the help and best regards!

Fabien

2 Replies Last Post 2012年2月28日 GMT-5 09:00
Alexander Kuznetsov
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Posted: 1 decade ago 2012年2月23日 GMT-5 13:48
I had exactly the same problem. I could solve the problem for only about 50 combinations of parameters.
Increasing Java heap size really helped (from 1024 to 8192 with 48Gb of RAM available). Now I can solve 200 without any problems.
I had exactly the same problem. I could solve the problem for only about 50 combinations of parameters. Increasing Java heap size really helped (from 1024 to 8192 with 48Gb of RAM available). Now I can solve 200 without any problems.
Fabien
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Posted: 1 decade ago 2012年2月28日 GMT-5 09:00

Dear Alexander

Thanks for your answer. I will try to increase the heap size even more (even if I don't understand why a simple loop requires so much memory...)

All the best,

Fabien

Dear Alexander Thanks for your answer. I will try to increase the heap size even more (even if I don't understand why a simple loop requires so much memory...) All the best, Fabien

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