[petsc-users] [mumps-users] MUMPS error

[Hui Zhang]

No, it is a 27-stencil discretization.  I use petsc MatXSetPreallocation with much larger estimates for off-diagonal (i.e. on other processors) zeros.  Basically, I say 27 non-zeros per row are on other processors.  Does this cause the MUMPS error?  Thanks a lot!

On Feb 23, 2013, at 9:56 AM, paresh murthy wrote:

> Hello Mike,
> 
> I would guess, as perhaps others might as well, that it is trying to solve a million x million dense matrix.
> Are you sure you have removed the zeroes and given it a sparse matrix ?
> 
> Paresh
> 
> 
> From: Hui Zhang <mike.hui.zhang at hotmail.com>
> To: mumps-users at listes.ens-lyon.fr; PETSc users list <petsc-users at mcs.anl.gov> 
> Cc: Hui Zhang <mike.hui.zhang at hotmail.com> 
> Sent: Saturday, February 23, 2013 9:51 AM
> Subject: [mumps-users] MUMPS error
> 
> Error reported by MUMPS in numerical factorization phase: Cannot allocate required memory 70397575 megabytes
> 
> The required memory is too large. Is that normal? I'm solving a Helmholtz equation on 100^3 mesh partitioned to 4^3 processors.
> 
> 
> 
>