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6.12.6 MPI Wisdom Communication

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To facilitate synchronizing wisdom among the different MPI processes, cannam@127: we provide two functions: cannam@127:

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void fftw_mpi_gather_wisdom(MPI_Comm comm);
cannam@127: void fftw_mpi_broadcast_wisdom(MPI_Comm comm);
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The fftw_mpi_gather_wisdom function gathers all wisdom in the cannam@127: given communicator comm to the process of rank 0 in the cannam@127: communicator: that process obtains the union of all wisdom on all the cannam@127: processes. As a side effect, some other processes will gain cannam@127: additional wisdom from other processes, but only process 0 will gain cannam@127: the complete union. cannam@127:

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The fftw_mpi_broadcast_wisdom does the reverse: it exports cannam@127: wisdom from process 0 in comm to all other processes in the cannam@127: communicator, replacing any wisdom they currently have. cannam@127:

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See FFTW MPI Wisdom. cannam@127:

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