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To facilitate synchronizing wisdom among the different MPI processes, Chris@19: we provide two functions: Chris@19: Chris@19:
void fftw_mpi_gather_wisdom(MPI_Comm comm); Chris@19: void fftw_mpi_broadcast_wisdom(MPI_Comm comm); Chris@19:Chris@19:
The fftw_mpi_gather_wisdom function gathers all wisdom in the
Chris@19: given communicator comm to the process of rank 0 in the
Chris@19: communicator: that process obtains the union of all wisdom on all the
Chris@19: processes. As a side effect, some other processes will gain
Chris@19: additional wisdom from other processes, but only process 0 will gain
Chris@19: the complete union.
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The fftw_mpi_broadcast_wisdom does the reverse: it exports
Chris@19: wisdom from process 0 in comm to all other processes in the
Chris@19: communicator, replacing any wisdom they currently have.
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See FFTW MPI Wisdom. Chris@19: Chris@19: Chris@19: Chris@19: