No you may run serial if you wish.
On Tue, Jun 21, 2016 at 12:40 PM 张江 <zhangjiang.d...@gmail.com> wrote:
> Thanks. So I have to build libmesh with PETSc?
>
> > On Jun 21, 2016, at 1:35 PM, John Peterson <jwpeter...@gmail.com> wrote:
> >
> >
> >
> > On Tue, Jun 21, 2016 at 12:28 PM, 张江 <zhangjiang.d...@gmail.com <mailto:
> zhangjiang.d...@gmail.com>> wrote:
> > Hi,
> >
> > I am using parallel environment to read an unstructured grid data so
> that each process is assigned one part of data.
> > But there is an error when running the program (mpiexec -n 2 ./out) at
> the following codes:
> >
> > eqsys = new EquationSystems(*mesh);
> >
> > asys = &(eqsys->add_system<System>("Velocity"));
> > Ax_var = asys->add_variable("Vx", FIRST, LAGRANGE);
> > Ay_var = asys->add_variable("Vy", FIRST, LAGRANGE);
> > Az_var = asys->add_variable("Vz", FIRST, LAGRANGE);
> >
> > eqsys->init();
> >
> >
> > The error is:
> >
> > Error: EigenError: EigenSparseVectors can onSparseVectors can only be
> usely be used in serial!d in serial!
> >
> > [1[0] ./inclu]
> ./include/libmesh/de/libmesh/eigen_spareigen_sparse_vector.h, line
> se_vector.h, line 506, compiled Jun 11 2016 at 16:06:07
> > 506, compiled Jun 11 2016 at 16:06:07
> > application called MPI_Abort(MPI_COMM_WORLD, 1) - process 0
> > application called MPI_Abort(MPI_COMM_WORLD, 1) - process 1
> >
> > It seems that the error occurs at eqsys->init(). Is there any wrong
> operation here? Thanks.
> >
> > You are attempting to run in parallel, but don't have a parallel
> SolverPackage (like PETSc) available for the NumericVector classes.
> >
> > --
> > John
>
>
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