Menu

Discussion Forum

New Discussion
Filtra

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 The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

RAM usage

Posted 22 nov 2011, 06:46 GMT-5 Studies & Solvers Version 4.2a 3 Replies

David Smith
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi,

I'm trying to solve an antenna model using the RF module. The computer is running Windows 7 and is a dual core 3GHz with 8GB of RAM. When solving and the model the memory shows 3GB/3.22GB only.

Could anybody give me some advice of how to use up to 8GB?

Thanks in advance.

Regards,
David
3 Replies Last Post 22 nov 2011, 07:49 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 22 nov 2011, 07:14 GMT-5
Hi

first you need win 7 -64 bit (but that I assume you have, with already > 3Gb of RAM)

The it depends on the model and the mesh size. Possibly also on the solver settings, you might get better use of the RAM if you use a direct solver (provided this is not already the case)

I any case, not all COMSOL operations are - can be made - parallelised

--
Good luck
Ivar
Hi first you need win 7 -64 bit (but that I assume you have, with already > 3Gb of RAM) The it depends on the model and the mesh size. Possibly also on the solver settings, you might get better use of the RAM if you use a direct solver (provided this is not already the case) I any case, not all COMSOL operations are - can be made - parallelised -- Good luck Ivar
David Smith
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 22 nov 2011, 07:47 GMT-5
Hi Ivar,

Thanks for your response. Yes, the PC is running Windows 7 64bit.

I will try the direct solver setting and see if the model solves.

Previously I was getting the message "Ill-conditioned preconditioner. Increase factor in error estimate." I have modified the mesh and reduced the relative tolerance.


Regards,
David
Hi Ivar, Thanks for your response. Yes, the PC is running Windows 7 64bit. I will try the direct solver setting and see if the model solves. Previously I was getting the message "Ill-conditioned preconditioner. Increase factor in error estimate." I have modified the mesh and reduced the relative tolerance. Regards, David
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 22 nov 2011, 07:49 GMT-5
Hi

All models might not run on direct solvers, some require iterative solvers, with or without segregation, it all depends ...

--
Good luck
Ivar
Hi All models might not run on direct solvers, some require iterative solvers, with or without segregation, it all depends ... -- Good luck Ivar

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content