[petsc-users] segfault in MatAssemblyEnd() when using large matrices on multi-core MAC OS-X

[Jed Brown]

On Mon, Jul 30, 2012 at 4:54 PM, Ronald M. Caplan <caplanr at predsci.com>wrote:

> Yes that is correct.  That is the updated code with each node storing its
> own values.  See my previous email to Matt for the old version which
> segfaults with processors more than 1 and npts =25.


$ mpiexec.hydra -n 2 ./petsctest
 N:        46575
 cores:            2
 MPI TEST:  My rank is:           0
 MPI TEST:  My rank is:           1
 Rank            0  has range            0  and        23288
 Rank            1  has range        23288  and        46575
 Number of non-zero entries in matrix:      690339
 Done setting matrix values...
 between assembly
 between assembly
 PETSc y=Ax time:      199.342865     nsec/mp.
 PETSc y=Ax flops:    0.415489674     GFLOPS.
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