Scalapack: How to increase Grid size. !!

Eswar Dev eswardev at yahoo.com
Tue Jul 31 21:22:11 EDT 2001


Hello Beowulf's:
   I could get rid of the TOTMEM ERROR but dont know
how to change process grid size for more than 1x1 so
that nprow*npcol can accept greater than 1 value
Right now I could only get executables run for p=1 q=1
any value more than that result in the previous
error-2
Please help!!
Respectfully,
-Eswarkumar.
______________________________________________________
> --__--__--
> 
> Message: 1
> Date: Mon, 30 Jul 2001 16:44:17 -0700 (PDT)
> From: Eswar Dev <eswardev at yahoo.com>
> Subject: Scalapack Help!!
> To: beowulf at beowulf.org
> 
> Greetings:
>   (This is my first mail to Bewoulf mailing list:)
>       I need some one to help me with running
> executables on Sacalapck. Iam stuck into this
> problem
> for quite some time now.
>    I was unable get good results using  scalapack on
> "MPI-Linux based Bewoulf cluster with 12 nodes".
> These are error message I always get with SCALAPACK.
>  1.Bad Memory parameters: goining into the case.
>  Unable to perform factorisation: need TOTMEM of at
> least 4944943 (Maximum Matrix size I can use is
> 250X250).
>  2.ILLEGAL GRID: nprow*npcol = 8. It can atleast be
> 1.
> 
>  I get rid of 2nd error only if I make Grid size 1 X
> 1
> for any other grid size results in error but that
> results in my solution time and LU time to be Zero
> which is useless. I run the executables for more
> than
> 1
>  node up to 1 nodes.
>    I tried varying Parametes for M, N , NB NRHS
> NBRHS
> but they dont seem to result in any kinda
> improvement
> in SACALAPACK perfromance.
>  Please help solve this Problem.
>  Our website for Bewoulf is
> http://atlantis.engr.odu.edu
> 
>  Thanking you,
> Respectfully,
> -Eswarkumar.
> 
_______________________________________________________


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