[petsc-users] Is there any method to call multiple mpi run inside program

[Jed Brown]

张国熙 <altriaex86 at gmail.com> writes:

> Hi, all
>
> I use SLEPc as part of my program, which means I compile it as .so library.
>
> I want my program work like this: execute serially, reach Point A, parallel
> solving, then serially again.
>
> I know I could use mpirun -np 4 in terminal to call the whole program,
> but this will let the serial part be executed 4 times. 

This may not be bad, but you can MPI_Comm_rank(MPI_COMM_WORLD,&rank), if
(rank == 0) { ... do the serial stuff ...}.

> What I want is only call mpi at the eigensolving part.  Is there any
> function that could achieve something like that?

There is MPI_Comm_spawn, but it's sort of a mess for resource
management/portability problem so I would recommend just using mpiexec.
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