Attributes are key/value pairs that can be attached to communicators, and are generally used to maintain communicator-specific information across different libraries or different languages.

Contains the attributes attached to a communicator.

A CartesianCommunicator is a form of Intracommunicator whose processes are arranged in a grid of arbitrary dimensions.

Provides communication among a set of MPI processes.

Information about a specific message that has already been transferred via MPI.

Provides a mapping from .NET types to their corresponding MPI datatypes. This class should only be used by experts in both MPI's low-level (C) interfaces and the interaction between managed and unmanaged code in .NET.

Provides MPI initialization, finalization, and environmental queries.

A GraphCommunicator is a form of Intracommunicator where the processes are connected in an arbitrary graph topology.

The Group class provides the ability to manipulate sets of MPI processes.

Intercommunicators are Communicators that contain two disjoint groups of processes, an each process can communicate only with processes in the other group.

Intracommunicators provide communication among a set of MPI processes.

An exception thrown when an MPI message has been truncated on receive.

The Operation class provides reduction operations for use with the reduction collectives.

A non-blocking receive request.

A non-blocking communication request.

A request list contains a list of outstanding MPI requests.

Contains information about a specific message transmitted via MPI.

A communicator with extra topological information that describes the typical communication patterns among the processes.

Direct, low-level interface to the system MPI library.

Placeholder type that is used to indicate that data being sent by one of the low-level MPI routines is packed by MPI.

Low-level representation of the status of an MPI communication operation.

A reduction operation that combines two values to produce a third value.

Delegate describing a low-level MPI function used to copy attribute values from a communicator when the communicator is being duplicated.

Delegate describing a low-level MPI function that takes care of de-allocating an attribute when it is deleted from a communicator (or the communicator itself is freed).

Enumeration describing how a given attribute should be copied (or not) when the communicator is cloned (duplicated).

The result of a comparison between two MPI objects.

Enumeration describing the level of threading support provided by the MPI implementation. The MPI environment should be initialized with the minimum threading support required for your application, because additional threading support can have a negative impact on performance. The four options providing monotonically-increasing levels of freedom for the MPI program. Thus, a program implemented based on the Threading.Single semantics will work perfectly well (although perhaps less efficiently) with Threading.Multiple.