[petsc-users] Tips on integrating MPI ksp petsc into my application?

[Mark Adams]

I assume you are using PETSc to load matices. What example are you looking
at?

On Mon, Dec 6, 2021 at 11:04 PM Faraz Hussain via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> I am studying the examples but it seems all ranks read the full matrix. Is
> there an MPI example where only rank 0 reads the matrix?
>
> I don't want all ranks to read my input matrix and consume a lot of memory
> allocating data for the arrays.
>
> I have worked with Intel's cluster sparse solver and their documentation
> states:
>
> " Most of the input parameters must be set on the master MPI process only,
> and ignored on other processes. Other MPI processes get all required data
> from the master MPI process using the MPI communicator, comm. "
>
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