[petsc-users] VecScatter Error w/Multiple Processors

[Arthur Kurlej]

Hello,

I am trying to use VecScatter to grab values from nonlocal processors, and
I've run into the following error when I try to run for 8+ processors. The
error is as follows:

[0]PETSC ERROR: VecScatterCreate() line 1161 in src/vec/vec/utils/vscat.c

And the code that causes it is

Mat A
MatGetOwnershipRange(A,&Istart,&Iend);

for(rowcounter = Istart; rowcounter < Iend; rowcounter++){

 ISCreateGeneral(PETSC_COMM_WORLD,lSize,vecIndices,PETSC_COPY_VALUES,&isGlobal);

 VecScatterCreate(gVec,isGlobal,lVec, NULL,&ctx);
 VecScatterBegin(ctx,gVec,lVec,INSERT_VALUES,SCATTER_FORWARD);
 VecScatterEnd(ctx,gVec,lVec,INSERT_VALUES,SCATTER_FORWARD);

 //fill matrix
}

Any thoughts?