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RAM and Swap Space and HD space

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Old   March 8, 2001, 13:01
Default RAM and Swap Space and HD space
  #1
Anindya
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I would like to know the size of RAM as well as Swap space that I would need to run a 3D problem with STarCD. I am using a SGI machine. I am planning to use about 500000(0.5 million) - 1000000 (1 Million) cells.

Also I would like to know the HD space that I would need for a typical LES run using StarCd in 3D assuming I use a 100*100*50 mesh and store U, V, W and P

Thanks
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Old   March 9, 2001, 03:07
Default Re: RAM and Swap Space and HD space
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Jens Bennetsen
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Hi,

As posted else where.

I will recommend you not to use any sap space at all since that will degrade your performance very much. But you will properbly need about 2 - 4 time the physical memory in the computer, for just in case.

As for the RAM, Star solver will need approx:

40-50 Mb per 100.000 hex cell

In your case that would be around 200 Mb - 500 Mb, (0.5 - 1.0 Mil cells) depending on your model, user functions etc.

As for the HD space when doing LES, it depend on how many time step you will store !

If you use th user fortran interface and store the variables by you self an estimate would be

100*100*50 * 8 byte(real) * No. of Variables * No. of time step.

I do not quite know if you will use the pst files for storing the data, but approx. the same.

Regards

Jens
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