[petsc-users] multi-threaded assembly

Jed Brown jed at jedbrown.org
Mon Jun 23 21:59:38 CDT 2014

Wen Jiang <jiangwen84 at gmail.com> writes:

> Dear all,
> I am trying to change my MPI finite element code to OPENMP one. I am not
> familiar with the usage of OPENMP in PETSc and could anyone give me some
> suggestions?
> To assemble the matrix in parallel using OpenMP pragmas, can I directly
> call MATSETVALUES(ADD_VALUES) or do I need to add some locks around it?

You need to ensure that only one thread is setting values on a given
matrix at any one time.
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