张国熙 <[email protected]> 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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