[petsc-users] Parallel matrix multiplication

Karthikeyan Chockalingam - STFC UKRI karthikeyan.chockalingam at stfc.ac.uk
Mon Jul 17 12:13:59 CDT 2023


I would like to perform the following operation

[P^T A P] x’ = P^T f

Where P is a rectangular matrix and A is a square matrix.  All the matrixes are constructed using MPIAIJ.

Should I be concerned about the parallel partitioning of the matrix P and A?

Or can I just go ahead and use MatMatMult to compute [P^T A P]?

Is there any in-built functionality to perform this operation?

Kind regards,

Dr. Karthik Chockalingam
High-Performance Software Engineer
Hartree Centre | Science and Technology Facilities Council
karthikeyan.chockalingam at stfc.ac.uk<mailto:karthikeyan.chockalingam at stfc.ac.uk>


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