[petsc-users] Customizeing MatSetValuesBlocked(...)

[Jinquan Zhong]

This makes sense to me.  I thought the preallocation only applies to MatCreateMPIAIJwithArrays(…) and other more complicate functions.

The matrix coming out from ScaLAPACK will be repopulated into a sparse matrix in a much large scale.  Do I need to install elemental package in PETSc in order to use MATELEMENTAL?

Thanks, Jed.

Jinquan


From: petsc-users-bounces at mcs.anl.gov [mailto:petsc-users-bounces at mcs.anl.gov] On Behalf Of Jed Brown
Sent: Wednesday, August 08, 2012 11:54 AM
To: PETSc users list
Subject: Re: [petsc-users] Customizeing MatSetValuesBlocked(...)

On Wed, Aug 8, 2012 at 12:47 PM, Jinquan Zhong <jzhong at scsolutions.com<mailto:jzhong at scsolutions.com>> wrote:
Are you referring to preallocating memory for the size of A before MatSetValues(A, ...)?  I didn't do that.

This is very important.

http://www.mcs.anl.gov/petsc/documentation/faq.html#efficient-assembly


With petsc-dev, it is best to use MATELEMENTAL for dense matrices.

What are you trying to do with this dense martix?
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