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# MATAIJVIENNACL

MATMPIAIJVIENNACL= “aijviennacl” = “mpiaijviennacl” - A matrix type to be used for sparse matrices. A matrix type (CSR format) whose data resides on GPUs. All matrix calculations are performed using the ViennaCL library.

This matrix type is identical to `MATSEQAIJVIENNACL` when constructed with a single process communicator, and `MATMPIAIJVIENNACL` otherwise. As a result, for single process communicators, `MatSeqAIJSetPreallocation()` is supported, and similarly `MatMPIAIJSetPreallocation()` is supported for communicators controlling multiple processes. It is recommended that you call both of the above preallocation routines for simplicity.

## Options Database Keys

- -mat_type mpiaijviennacl - sets the matrix type to `MATAIJVIENNACL` during a call to `MatSetFromOptions()`

## See Also

`Mat`, `MatType`, `MatCreateAIJViennaCL()`, `MATSEQAIJVIENNACL`, `MatCreateSeqAIJVIENNACL()`

## Level

beginner

## Location

src/mat/impls/aij/mpi/mpiviennacl/mpiaijviennacl.cxx

Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages