Rmpi: mpi.probe – R documentation

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mpi.probe

MPI\_Probe and MPI\_Iprobe APIs

Description

mpi.probe uses the source and tag of incoming message to set a status. mpi.iprobe does the same except it is a nonblocking call, i.e., returns immediately.

Usage

mpi.probe(source, tag, comm = 1, status = 0)
mpi.iprobe(source, tag, comm = 1, status = 0)

Arguments

`source`	the source of incoming message or mpi.any.source() for any source.
`tag`	a tag number or mpi.any.tag() for any tag.
`comm`	a communicator number
`status`	a status number

Details

When mpi.send or other nonblocking sends are used to send a message, the receiver may not know the exact length before receiving it. mpi.probe is used to probe the incoming message and put some information into a status. Then the exact length can be found by using mpi.get.count to such a status. If the wild card mpi.any.source or mpi.any.tag are used, then one can use mpi.get.sourcetag to find the exact source or tag of a sender.

Value

mpi.probe returns 1 only after a matching message has been found.

mpi.iproble returns TRUE if there is a message that can be received; FALSE otherwise.

Author(s)

Hao Yu

References

https://www.open-mpi.org/