[petsc-users] AllReduce function for mat

[Barry Smith]

> On Feb 9, 2015, at 10:57 AM, Ghosh, Swarnava <sghosh2012 at gatech.edu> wrote:
> 
> Hi,
> 
>   I have sequential matrix on each process. I wanted to do something like MPI_Allreduce to this matrix to add entries from all processes. The resulting matrix is sequential. 

   Is the matrix dense or sparse?
   If sparse is each process providing a different set of nonzero values? Or are all processes providing ALL nonzeros in the matrix (to be added together). 

>   I wanted to know if there is a PETSc function to do this?
> 
> -- 
> SG
>