[petsc-users] Memory for matrix assembly

Jed Brown jedbrown at mcs.anl.gov
Tue Nov 22 08:50:16 CST 2011

On Tue, Nov 22, 2011 at 08:30, Andrej Mesaros <andrej.mesaros at bc.edu> wrote:

> Given that I indeed call MatSetValues exclusively with row indices within
> the range determined by MatGetOwnershipRange, it should be impossible to
> generate entries on the wrong process, right? In such a case, could the
> corruption you mention be somehow due to the way I call other PETSc
> functions? Or is it at all possible that too small preallocation is making
> a problem?

Try setting these options and running in debug mode.


> Also, what is the meaning of the memories in the report: "allocated",

obtained with PetscMalloc()


> "used by process"

resident set size returned by getrusage(), procfs, or similar


> and "requested"?

Amount you are trying to allocate now.
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