Copyright (c) 2018 FUJITSU LIMITED. All rights reserved.
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This extension provides the feature of persistent collective communication
operations and persistent neighborhood collective communication operations,
which is planned to be included in the next MPI Standard after MPI-3.1 as
of Nov. 2018.
See MPIX_Barrier_init(3) for more details.
The code will be moved to the ompi/mpi directory and the MPIX_ prefix will
be switch to the MPI_ prefix once the MPI Standard which includes this
feature is published.
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