Constructs a new intercommunicator that provides communication between two groups of processes, specified by intracommunicators. This is a collective operation involving all of the processes in the communicators passed via localComm.

Terminates all processes in this communicator. In most systems, this terminates all processes.

Adopts a low-level MPI intercommunicator that was created with any of the low-level MPI facilities. The resulting Intercommunicator object will manage the lifetime of the low-level MPI intercommunicator, and will call MPI_Comm_free(Int32%) when it is disposed or finalized.

Collective operation in which every process in one group sends data to every process of the other group. Alltoall differs from Allgather<(Of <(T>)>)(T) in that a given process can send different data to all of the other processes, rather than contributing the same piece of data to all processes.

Wait until all processes in the communicator have reached the same barrier.

Clones the communicator, creating a new (but distinct) communicator with the same processes. The attributes associated with the communicator are copied to the new communicator; which attributes are copied (and how) is dependent on how the Attributes were created.

Compare two MPI communicators.

Creates a new communicator containing all of the processes in the given group. The resulting communicator may be null, if the calling process is not in this group.

Free the MPI communicator.

Finalizer that frees the MPI communicator.

Determine whether a message from the given source and with the specified tag is available, but don't try to receive the message. This routine will return immediately, regardless of whether a message is available, so it is useful for polling to determine whether any messages need to be handled at this time. If your program can't do any work until a message arrives (and the message is guaranteed to arrive, eventually), use Probe(Int32, Int32) instead.

Merge all of the processes in both groups of an intercommunicator into a single intracommunicator. While the intercommunicator only allows communication among processes in different groups, the merged intracommunicator allows communication among all of the processes in either group, regardless of which group the source and target were in.

Wait for a message from the given source and with the specified tag to become available, but don't try to receive the message. This routine will wait indefinitely for a message meeting the given criteria to arrive, so it should only be invoked when you know a message is coming. If you just want to check whether a message is available use ImmediateProbe(Int32, Int32).

Splits a communicator into several different communicators, each of which is identified by a particular color value.

The set of attributes attached to this communicator.

For a collective operation, indicates that this process is the same group as the root but is not the root (and thus is not receiving any data). These processes should pass this is as the root for calls to collective communication procedures. Processes in the group sending to the root should use the root process' local rank. The root process should pass in Root.

Indicates that this process is the root for a collective operation. The root process should pass this constant in as the value for root for calls to collective operations. Other processes in the same group as root should use Null. Processes in the group sending to the root should use the root process' local rank.

Retrieve the group containing all of the processes in this communicator.

Returns the rank of the currently executing process within this communicator.

Retrieve the group containing all of the remote processes in this intercommunicator.

Returns the number of processes in the remote group of this intercommunicator.

Returns the number of processes within this communicator.