Module mpi::topology

Organizing processes as groups and communicators

Processes are organized in communicators. All parallel processes initially partaking in the computation are organized in a context called the 'world communicator' which is available as a property of the Universe. From the world communicator, other communicators can be created. Processes can be addressed via their Rank within a specific communicator. This information is encapsulated in a Process.

Unfinished features

• 6.3: Group management
  • 6.3.2: Constructors, MPI_Group_range_incl(), MPI_Group_range_excl()
• 6.4: Communicator management
  • 6.4.2: Constructors, MPI_Comm_dup_with_info(), MPI_Comm_idup(), MPI_Comm_split_type()
  • 6.4.4: Info, MPI_Comm_set_info(), MPI_Comm_get_info()
• 6.6: Inter-communication
• 6.7: Caching
• 6.8: Naming objects
• 7: Process topologies
• Parts of sections: 8, 10, 12

Modules

traits

Topology traits

Structs

AnyProcess	Identifies an arbitrary process that is a member of a certain communicator, e.g. for use as a Source in point to point communication.
Color	A color used in a communicator split
Process	Identifies a process by its Rank within a certain communicator.
SystemCommunicator	A built-in communicator, e.g. MPI_COMM_WORLD
SystemGroup	A built-in group, e.g. MPI_GROUP_EMPTY
UserCommunicator	A user-defined communicator
UserGroup	A user-defined group of processes

Enums

CommunicatorRelation	The relation between two communicators.
GroupRelation	The relation between two groups.

Traits

AsCommunicator	Something that has a communicator associated with it
Communicator	Communicators are contexts for communication
Group	Groups are collections of parallel processes

Type Definitions

Key	A key used when determining the rank order of processes after a communicator split.
Rank	Identifies a certain process within a communicator.