| MPI_COMM_TEST_INTER(comm, flag) | |
| IN comm | communicator (handle) |
| OUT flag | (logical) |
int MPI_Comm_test_inter(MPI_Comm comm, int *flag)
MPI_COMM_TEST_INTER(COMM, FLAG, IERROR)
When an inter-communicator is used as an input argument to the
communicator accessors described above under intra-communication, the
following table describes behavior.
INTEGER COMM, IERROR
LOGICAL FLAG
{ bool MPI::Comm::Is_inter() const (binding deprecated, see Section Deprecated since MPI-2.2
) }
This local routine allows the calling process to determine if a
communicator is an inter-communicator or an intra-communicator. It returns
true if it is an inter-communicator, otherwise false.
| MPI_COMM_SIZE | returns the size of the local group. |
| MPI_COMM_GROUP | returns the local group. |
| MPI_COMM_RANK | returns the rank in the local group |
Furthermore, the operation MPI_COMM_COMPARE is valid for inter-communicators. Both communicators must be either intra- or inter-communicators, or else MPI_UNEQUAL results. Both corresponding local and remote groups must compare correctly to get the results MPI_CONGRUENT and MPI_SIMILAR. In particular, it is possible for MPI_SIMILAR to result because either the local or remote groups were similar but not identical.
The following accessors provide consistent access to the remote group of an inter-communicator:
The following are all local operations.
| MPI_COMM_REMOTE_SIZE(comm, size) | |
| IN comm | inter-communicator (handle) |
| OUT size | number of processes in the remote group of comm (integer) |
int MPI_Comm_remote_size(MPI_Comm comm, int *size)
MPI_COMM_REMOTE_SIZE(COMM, SIZE, IERROR)
int MPI_Comm_remote_group(MPI_Comm comm, MPI_Group *group)
MPI_COMM_REMOTE_GROUP(COMM, GROUP, IERROR)
Symmetric access to both the local and remote groups of an inter-communicator
is important, so this function, as well as MPI_COMM_REMOTE_SIZE have
been provided.
( End of rationale.)
INTEGER COMM, SIZE, IERROR
{ int MPI::Intercomm::Get_remote_size() const (binding deprecated, see Section Deprecated since MPI-2.2
) }
MPI_COMM_REMOTE_GROUP(comm, group) IN comm inter-communicator (handle) OUT group remote group corresponding to comm (handle)
INTEGER COMM, GROUP, IERROR
{ MPI::Group MPI::Intercomm::Get_remote_group() const (binding deprecated, see Section Deprecated since MPI-2.2
) }
Rationale.
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