[petsc-users] Iterative solver behavior with increasing number of mpi

Marian Greg marian.greg.007 at gmail.com
Wed Apr 17 10:27:15 CDT 2019

Hi All,

I am facing strange behavior of the ksp solvers with increasing number of
MPI. The solver is taking more and more iterations with increase in number
of MPIs. Is that a normal situation? I was expecting to get the same number
of iteration with whatever number of MPIs I use.

My matrix has about 2 million dofs
Solving with np 1 takes about 3500 iteration while solving with np 4 takes
6500 iterations for the same convergence criteria.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20190417/44517130/attachment.html>

More information about the petsc-users mailing list