MPI Programming and Subroutine Reference

Table of Subroutines

Table 1 lists the subroutines in alphabetical order. Refer to the appropriate section in Chapter 2 for information related to subroutine purpose, syntax, and other information.

Table 1. Table of Subroutines

Subroutine C/FORTRAN	Page	Type	Description
MPE_Iallgather MPE_IALLGATHER	MPE_IALLGATHER, MPE_Iallgather	Nonblocking Collective Communication	Nonblocking allgather operation.
MPE_Iallgatherv MPE_IALLGATHERV	MPE_IALLGATHERV, MPE_Iallgatherv	Nonblocking Collective Communication	Nonblocking allgatherv operation.
MPE_Iallreduce MPE_IALLREDUCE	MPE_IALLREDUCE, MPE_Iallreduce	Nonblocking Collective Communication	Nonblocking allreduce operation.
MPE_Ialltoall MPE_IALLTOALL	MPE_IALLTOALL, MPE_Ialltoall	Nonblocking Collective Communication	Nonblocking alltoall operation.
MPE_Ialltoallv MPE_IALLTOALLV	MPE_IALLTOALLV, MPE_Ialltoallv	Nonblocking Collective Communication	Nonblocking alltoallv operation.
MPE_Ibarrier MPE_IBARRIER	MPE_IBARRIER, MPE_Ibarrier	Nonblocking Collective Communication	Nonblocking barrier operation.
MPE_Ibcast MPE_IBCAST	MPE_IBCAST, MPE_Ibcast	Nonblocking Collective Communication	Nonblocking broadcast operation.
MPE_Igather MPE_IGATHER	MPE_IGATHER, MPE_Igather	Nonblocking Collective Communication	Nonblocking gather operation.
MPE_Igatherv MPE_IGATHERV	MPE_IGATHERV, MPE_Igatherv	Nonblocking Collective Communication	Nonblocking gatherv operation.
MPE_Ireduce MPE_IREDUCE	MPE_IREDUCE, MPE_Ireduce	Nonblocking Collective Communication	Nonblocking reduce operation.
MPE_Ireduce_scatter MPE_IREDUCE_SCATTER	MPE_IREDUCE_SCATTER, MPE_Ireduce_scatter	Nonblocking Collective Communication	Nonblocking reduce_scatter operation.
MPE_Iscan MPE_ISCAN	MPE_ISCAN, MPE_Iscan	Nonblocking Collective Communication	Nonblocking scan operation.
MPE_Iscatter MPE_ISCATTER	MPE_ISCATTER, MPE_Iscatter	Nonblocking Collective Communication	Nonblocking scatter operation.
MPE_Iscatterv MPE_ISCATTERV	MPE_ISCATTERV, MPE_Iscatterv	Nonblocking Collective Communication	Nonblocking scatterv operation.
MPI_Abort MPI_ABORT	MPI_ABORT, MPI_Abort	Environment Management	Forces all tasks of an MPI job to terminate.
MPI_Address MPI_ADDRESS	MPI_ADDRESS, MPI_Address	Derived Datatype	Returns address of a location in memory.
MPI_Allgather MPI_ALLGATHER	MPI_ALLGATHER, MPI_Allgather	Collective Communication	Collects messages from each task and distributes the resulting message to each.
MPI_Allgatherv MPI_ALLGATHERV	MPI_ALLGATHERV, MPI_Allgatherv	Collective Communication	Collects messages from each task and distributes the resulting message to all tasks. Messages can have variable sizes and displacements.
MPI_Allreduce MPI_ALLREDUCE	MPI_ALLREDUCE, MPI_Allreduce	Collective Communication	Applies a reduction operation.
MPI_Alltoall MPI_ALLTOALL	MPI_ALLTOALL, MPI_Alltoall	Collective Communication	Sends a distinct message from each task to every task.
MPI_Alltoallv MPI_ALLTOALLV	MPI_ALLTOALLV, MPI_Alltoallv	Collective Communication	Sends a distinct message from each task to every task. Messages can have different sizes and displacements.
MPI_Attr_delete MPI_ATTR_DELETE	MPI_ATTR_DELETE, MPI_Attr_delete	Communicator	Removes an attribute value from a communicator.
MPI_Attr_get MPI_ATTR_GET	MPI_ATTR_GET, MPI_Attr_get	Communicator	Retrieves an attribute value from a communicator.
MPI_Attr_put MPI_ATTR_PUT	MPI_ATTR_PUT, MPI_Attr_put	Communicator	Associates an attribute value with a communicator.
MPI_Barrier MPI_BARRIER	MPI_BARRIER, MPI_Barrier	Collective Communication	Blocks each task until all tasks have called it.
MPI_Bcast MPI_BCAST	MPI_BCAST, MPI_Bcast	Collective Communication	Broadcasts a message from root to all tasks in the group.
MPI_Bsend MPI_BSEND	MPI_BSEND, MPI_Bsend	Point-to-Point	Blocking buffered mode send.
MPI_Bsend_init MPI_BSEND_INIT	MPI_BSEND_INIT, MPI_Bsend_init	Point-to-Point	Creates a persistent buffered mode send request.
MPI_Buffer_attach MPI_BUFFER_ATTACH	MPI_BUFFER_ATTACH, MPI_Buffer_attach	Point-to-Point	Provides MPI with a message buffer for sending.
MPI_Buffer_detach MPI_BUFFER_DETACH	MPI_BUFFER_DETACH, MPI_Buffer_detach	Point-to-Point	Detaches the current buffer.
MPI_Cancel MPI_CANCEL	MPI_CANCEL, MPI_Cancel	Point-to-Point File	Marks a nonblocking operation for cancellation.
MPI_Cart_coords MPI_CART_COORDS	MPI_CART_COORDS, MPI_Cart_coords	Topology	Translates task rank in a communicator into cartesian task coordinates.
MPI_Cart_create MPI_CART_CREATE	MPI_CART_CREATE, MPI_Cart_create	Topology	Creates a communicator containing topology information.
MPI_Cart_get MPI_CART_GET	MPI_CART_GET, MPI_Cart_get	Topology	Retrieves cartesian topology information from a communicator.
MPI_Cart_map MPI_CART_MAP	MPI_CART_MAP, MPI_Cart_map	Topology	Computes placement of tasks on the physical machine.
MPI_Cart_rank MPI_CART_RANK	MPI_CART_RANK, MPI_Cart_rank	Topology	Translates task coordinates into a task rank.
MPI_Cart_shift MPI_CART_SHIFT	MPI_CART_SHIFT, MPI_Cart_shift	Topology	Returns shifted source and destination ranks for a task.
MPI_Cart_sub MPI_CART_SUB	MPI_CART_SUB, MPI_Cart_sub	Topology	Partitions a cartesian communicator into lower-dimensional subgroups.
MPI_Cartdim_get MPI_CARTDIM_GET	MPI_CARTDIM_GET, MPI_Cartdim_get	Topology	Retrieves the number of cartesian dimensions from a communicator.
MPI_Comm_compare MPI_COMM_COMPARE	MPI_COMM_COMPARE, MPI_Comm_compare	Communicator	Compares the groups and contexts of two communicators.
MPI_Comm_create MPI_COMM_CREATE	MPI_COMM_CREATE, MPI_Comm_create	Communicator	Creates a new intracommunicator with a given group.
MPI_Comm_dup MPI_COMM_DUP	MPI_COMM_DUP, MPI_Comm_dup	Communicator	Creates a new communicator that is a duplicate of an existing communicator.
MPI_Comm_free MPI_COMM_FREE	MPI_COMM_FREE, MPI_Comm_free	Communicator	Marks a communicator for deallocation.
MPI_Comm_group MPI_COMM_GROUP	MPI_COMM_GROUP, MPI_Comm_group	Task Group	Returns the group handle associated with a communicator.
MPI_Comm_rank MPI_COMM_RANK	MPI_COMM_RANK, MPI_Comm_rank	Communicator	Returns the rank of the local task in the group associated with a communicator.
MPI_Comm_remote_group MPI_COMM_REMOTE_GROUP	MPI_COMM_REMOTE_GROUP, MPI_Comm_remote_group	Communicator	Returns the handle of the remote group of an intercommunicator.
MPI_Comm_remote_size MPI_COMM_REMOTE_SIZE	MPI_COMM_REMOTE_SIZE, MPI_Comm_remote_size	Communicator	Returns the size of the remote group of an intercommunicator.
MPI_Comm_size MPI_COMM_SIZE	MPI_COMM_SIZE, MPI_Comm_size	Communicator	Returns the size of the group associated with a communicator.
MPI_Comm_split MPI_COMM_SPLIT	MPI_COMM_SPLIT, MPI_Comm_split	Communicator	Splits a communicator into multiple communicators based on color and key.
MPI_Comm_test_inter MPI_COMM_TEST_INTER	MPI_COMM_TEST_INTER, MPI_Comm_test_inter	Communicator	Returns the type of a communicator (intra or inter).
MPI_Dims_create MPI_DIMS_CREATE	MPI_DIMS_CREATE, MPI_Dims_create	Topology	Defines a cartesian grid to balance tasks.
MPI_Errorhandler_create MPI_ERRORHANDLER_CREATE	MPI_ERRHANDLER_CREATE, MPI_Errhandler_create	Environment Management	Registers a user defined error handler.
MPI_Errorhandler_free MPI_ERRORHANDLER_FREE	MPI_ERRHANDLER_FREE, MPI_Errhandler_free	Environment Management	Marks an error handler for deallocation.
MPI_Errorhandler_get MPI_ERRORHANDLER_GET	MPI_ERRHANDLER_GET, MPI_Errhandler_get	Environment Management	Gets an error handler associated with a communicator.
MPI_Errorhandler_set MPI_ERRORHANDLER_SET	MPI_ERRHANDLER_SET, MPI_Errhandler_set	Environment Management	Associates a new error handler with a communicator.
MPI_Error_class MPI_ERROR_CLASS	MPI_ERROR_CLASS, MPI_Error_class	Environment Management	Returns the error class for the corresponding error code.
MPI_Error_string MPI_ERROR_STRING	MPI_ERROR_STRING, MPI_Error_string	Environment Management	Returns the error string for a given error code.
MPI_File_close MPI_FILE_CLOSE	MPI_FILE_CLOSE, MPI_File_close	File	Closes a file.
MPI_File_create_errhandler MPI_FILE_CREATE_ERRHANDLER	MPI_FILE_CREATE_ERRHANDLER, MPI_File_create_errhandler	Environment Management	Registers a user-defined error handler that you can associate with an open file.
MPI_File_delete MPI_FILE_DELETE	MPI_FILE_DELETE, MPI_File_delete	File	Deletes a file after pending operations to the file complete.
MPI_File_get_amode MPI_FILE_GET_AMODE	MPI_FILE_GET_AMODE, MPI_File_get_amode	File	Retrieves the access mode specified when the file was opened.
MPI_File_get_atomicity MPI_FILE_GET_ATOMICITY	MPI_FILE_GET_ATOMICITY, MPI_File_get_atomicity	File	Retrieves the current atomicity mode in which the file is accessed
MPI_File_get_errhandler MPI_FILE_GET_ERRHANDLER	MPI_FILE_GET_ERRHANDLER, MPI_File_get_errhandler	Environment Management	Retrieves the error handler currently associated with a file handle.
MPI_File_get_group MPI_FILE_GET_GROUP	MPI_FILE_GET_GROUP, MPI_File_get_group	File	Retrieves the group of tasks that opened the file.
MPI_File_get_info MPI_FILE_GET_INFO	MPI_FILE_GET_INFO, MPI_File_get_info	File	Returns a new info object identifying the hints associated with a file.
MPI_File_get_size MPI_FILE_GET_SIZE	MPI_FILE_GET_SIZE, MPI_File_get_size	File	Retrieves the current file size.
MPI_File_get_view MPI_FILE_GET_VIEW	MPI_FILE_GET_VIEW, MPI_File_get_view	File	Retrieves the current file view.
MPI_File_iread_at MPI_FILE_IREAD_AT	MPI_FILE_IREAD_AT, MPI_File_iread_at	File	Nonblocking read operation using an explicit offset.
MPI_File_iwrite_at MPI_FILE_IWRITE_AT	MPI_FILE_IWRITE_AT, MPI_File_iwrite_at	File	Nonblocking write operation using an explicit offset.
MPI_File_open MPI_FILE_OPEN	MPI_FILE_OPEN, MPI_File_open	File	Opens a file.
MPI_File_read_at MPI_FILE_READ_AT	MPI_FILE_READ_AT, MPI_File_read_at	File	Nonblocking read operation using an explicit offset.
MPI_File_read_at_all MPI_FILE_READ_AT_ALL	MPI_FILE_READ_AT_ALL, MPI_File_read_at_all	File	Collective version of MPI_FILE_READ_AT.
MPI_File_set_errhandler MPI_FILE_SET_ERRHANDLER	MPI_FILE_SET_ERRHANDLER, MPI_File_set_errhandler	Environment Management	Associates a new error handler with a file.
MPI_File_set_info MPI_FILE_SET_INFO	MPI_FILE_SET_INFO, MPI_File_set_info	File	Specifies new hints for an open file.
MPI_File_set_size MPI_FILE_SET_SIZE	MPI_FILE_SET_SIZE, MPI_File_set_size	File	Expands or truncates an open file.
MPI_File_set_view MPI_FILE_SET_VIEW	MPI_FILE_SET_VIEW, MPI_File_set_view	File	Associates a new view with an open file.
MPI_File_sync MPI_FILE_SYNC	MPI_FILE_SYNC, MPI_File_sync	File	Commits file updates of an open file to storage device(s).
MPI_File_write_at MPI_FILE_WRITE_AT	MPI_FILE_WRITE_AT, MPI_File_write_at	File	Nonblocking write operation using an explicit offset.
MPI_File_write_at_all MPI_FILE_WRITE_AT_ALL	MPI_FILE_WRITE_AT_ALL, MPI_File_write_at_all	File	Collective version of MPI_FILE_WRITE_AT.
MPI_Finalize MPI_FINALIZE	MPI_FINALIZE, MPI_Finalize	Environment Management	Terminates all MPI processing.
MPI_Gather MPI_GATHER	MPI_GATHER, MPI_Gather	Collective Communication	Collects individual messages from each task in a group at the root task.
MPI_Gatherv MPI_GATHERV	MPI_GATHERV, MPI_Gatherv	Collective Communication	Collects individual messages from each task in comm at the root task. Messages can have different sizes and displacements.
MPI_Get_count MPI_GET_COUNT	MPI_GET_COUNT, MPI_Get_count	Point-to-Point	Returns the number of elements in a message.
MPI_Get_elements MPI_GET_ELEMENTS	MPI_GET_ELEMENTS, MPI_Get_elements	Derived Datatype	Returns the number of basic elements in a message.
MPI_Get_processor_name MPI_GET_PROCESSOR_NAME	MPI_GET_PROCESSOR_NAME, MPI_Get_processor_name	Environment Management	Returns the name of the local processor.
MPI_Get_version MPI_GET_VERSION	MPI_GET_VERSION, MPI_Get_version	Environment Management	Returns the version of MPI standard supported.
MPI_Graph_create MPI_GRAPH_CREATE	MPI_GRAPH_CREATE, MPI_Graph_create	Topology	Creates a new communicator containing graph topology information.
MPI_Graph_get MPI_GRAPH_GET	MPI_GRAPH_GET, MPI_Graph_get	Topology	Retrieves graph topology information from a communicator.
MPI_Graph_map MPI_GRAPH_MAP	MPI_CART_MAP, MPI_Cart_map	Topology	Computes placement of tasks on the physical machine.
MPI_Graph_neighbors MPI_GRAPH_NEIGHBORS	MPI_GRAPH_NEIGHBORS, MPI_Graph_neighbors	Topology	Returns the neighbors of the given task.
MPI_Graph_neighbors_count MPI_GRAPH_NEIGHBORS_COUNT	MPI_GRAPH_NEIGHBORS_COUNT, MPI_Graph_neighbors_count	Topology	Returns the number of neighbors of the given task.
MPI_Graphdims_get MPI_GRAPHDIMS_GET	MPI_GRAPHDIMS_GET, MPI_Graphdims_get	Topology	Retrieves graph topology information from a communicator.
MPI_Group_compare MPI_GROUP_COMPARE	MPI_GROUP_COMPARE, MPI_Group_compare	Task Group	Compares the contents of two task groups.
MPI_Group_difference MPI_GROUP_DIFFERENCE	MPI_GROUP_DIFFERENCE, MPI_Group_difference	Task Group	Creates a new group that is the difference of two existing groups.
MPI_Group_excl MPI_GROUP_EXCL	MPI_GROUP_EXCL, MPI_Group_excl	Task Group	Removes selected tasks from an existing group to create a new group.
MPI_Group_free MPI_GROUP_FREE	MPI_GROUP_FREE, MPI_Group_free	Task Group	Marks a group for deallocation.
MPI_Group_incl MPI_GROUP_INCL	MPI_GROUP_INCL, MPI_Group_incl	Task Group	Creates a new group consisting of selected tasks from an existing group.
MPI_Group_intersection MPI_GROUP_INTERSECTION	MPI_GROUP_INTERSECTION, MPI_Group_intersection	Task Group	Creates a new group that is the intersection of two existing groups.
MPI_Group_range_excl MPI_GROUP_RANGE_EXCL	MPI_GROUP_RANGE_EXCL, MPI_Group_range_excl	Task Group	Creates a new group by excluding selected tasks of an existing group.
MPI_Group_range_incl MPI_GROUP_RANGE_INCL	MPI_GROUP_RANGE_INCL, MPI_Group_range_incl	Task Group	Creates a new group consisting of selected ranges of tasks from an existing group.
MPI_Group_rank MPI_GROUP_RANK	MPI_GROUP_RANK, MPI_Group_rank	Task Group	Returns the rank of the local task with respect to group.
MPI_Group_size MPI_GROUP_SIZE	MPI_GROUP_SIZE, MPI_Group_size	Task Group	Returns the number of tasks in a group.
MPI_Group_translate_ranks MPI_GROUP_TRANSLATE_RANKS	MPI_GROUP_TRANSLATE_RANKS, MPI_Group_translate_ranks	Task Group	Converts task ranks of one group into ranks of another group.
MPI_Group_union MPI_GROUP_UNION	MPI_GROUP_UNION, MPI_Group_union	Task Group	Creates a new group that is the union of two existing groups.
MPI_Ibsend MPI_IBSEND	MPI_IBSEND, MPI_Ibsend	Point-to-Point	Nonblocking buffered send.
MPI_Info_create MPI_INFO_CREATE	MPI_INFO_CREATE, MPI_Info_create	Info	Creates a new empty info object.
MPI_Info_delete MPI_INFO_DELETE	MPI_INFO_DELETE, MPI_Info_delete	Info	Deletes a (key, value) pair from an info object.
MPI_Info_dup MPI_INFO_DUP	MPI_INFO_DUP, MPI_Info_dup	Info	Duplicates an info object.
MPI_Info_free MPI_INFO_FREE	MPI_INFO_FREE, MPI_Info_free	Info	Frees an info object and sets its handle to MPI_INFO_NULL.
MPI_Info_get MPI_INFO_GET	MPI_INFO_GET, MPI_Info_get	Info	Retrieves the value associated with key in an info object.
MPI_Info_get_nkeys MPI_INFO_GET_NKEYS	MPI_INFO_GET_NKEYS, MPI_Info_get_nkeys	Info	Returns the number of keys defined in an info object.
MPI_Info_get_nthkey MPI_INFO_GET_NTHKEY	MPI_INFO_GET_NTHKEY, MPI_Info_get_nthkey	Info	Retrieves the nth key defined in an info object.
MPI_Info_get_valuelen MPI_INFO_GET_VALUELEN	MPI_INFO_GET_VALUELEN, MPI_Info_get_valuelen	Info	Retrieves the length of the value associated with a key of an info object.
MPI_Info_set MPI_INFO_SET	MPI_INFO_SET, MPI_Info_set	Info	Adds a pair (key, value) to an info object.
MPI_Init MPI_INIT	MPI_INIT, MPI_Init	Environment Management	Initializes MPI.
MPI_Initialized MPI_INITIALIZED	MPI_INITIALIZED, MPI_Initialized	Environment Management	Determines if MPI is initialized.
MPI_Intercomm_create MPI_INTERCOM_CREATE	MPI_INTERCOMM_CREATE, MPI_Intercomm_create	Communicator	Returns the handle of the remote group of an intercommunicator.
MPI_Intercomm_merge MPI_INTERCOMM_MERGE	MPI_INTERCOMM_MERGE, MPI_Intercomm_merge	Communicator	Creates an intracommunicator by merging the local and the remote groups of an intercommunicator.
MPI_Iprobe MPI_IPROBE	MPI_IPROBE, MPI_Iprobe	Point-to-Point	Checks if a message matching source, tag, and comm has arrived.
MPI_Irecv MPI_IRECV	MPI_IRECV, MPI_Irecv	Point-to-Point	Nonblocking receive.
MPI_Irsend MPI_IRSEND	MPI_IRSEND, MPI_Irsend	Point-to-Point	Nonblocking ready send.
MPI_Isend MPI_ISEND	MPI_ISEND, MPI_Isend	Point-to-Point	Nonblocking standard mode send.
MPI_Issend MPI_ISSEND	MPI_ISSEND, MPI_Issend	Point-to-Point	Nonblocking synchronous mode send.
MPI_Keyval_create MPI_KEYVAL_CREATE	MPI_KEYVAL_CREATE, MPI_Keyval_create	Communicator	Generates a new attribute key.
MPI_Keyval_free MPI_KEYVAL_FREE	MPI_KEYVAL_FREE, MPI_Keyval_free	Communicator	Marks an attribute key for deallocation.
MPI_Op_create MPI_OP_CREATE	MPI_OP_CREATE, MPI_Op_create	Collective Communication	Binds a user defined reduction operation to an op handle.
MPI_Op_free MPI_OP_FREE	MPI_OP_FREE, MPI_Op_free	Collective Communication	Marks a user defined reduction operation for deallocation.
MPI_Pack MPI_PACK	MPI_PACK, MPI_Pack	Derived Datatype	Packs the message in the specified send buffer into the specified buffer space.
MPI_Pack_size MPI_PACK_SIZE	MPI_PACK_SIZE, MPI_Pack_size	Dervived Datatype	Returns the number of bytes required to hold the data.
MPI_Pcontrol MPI_PCONTROL	MPI_PCONTROL, MPI_Pcontrol	Environment Management	Provides profile control.
MPI_Probe MPI_PROBE	MPI_PROBE, MPI_Probe	Point-to-Point	Waits until a message matching source, tag, and comm arrives.
MPI_Recv MPI_RECV	MPI_RECV, MPI_Recv	Point-to-Point	Blocking receive
MPI_Recv_init MPI_RECV_INIT	MPI_RECV_INIT, MPI_Recv_init	Point-to-Point	Creates a persistent receive request.
MPI_Reduce MPI_REDUCE	MPI_REDUCE, MPI_Reduce	Collective Communication	Reduces tasks specified and places the result in recvbuf on root.
MPI_Reduce_scatter MPI_REDUCE_SCATTER	MPI_REDUCE_SCATTER, MPI_Reduce_scatter	Collective Communication	Applies a reduction operation to the vector sendbuf over the set of tasks specified by comm and scatters the result according to the values in recvcounts.
MPI_Request_free MPI_REQUEST_FREE	MPI_REQUEST_FREE, MPI_Request_free	Point-to-Point	Marks a request for deallocation.
MPI_Rsend MPI_RSEND	MPI_RSEND, MPI_Rsend	Point-to-Point	Blocking ready mode send.
MPI_Rsend_init MPI_RSEND_INIT	MPI_RSEND_INIT, MPI_Rsend_init	Point-to-Point	Creates a persistent ready mode send request.
MPI_Sample MPI_SAMPLE	A_SAMPLE, A_Sample	Sample	This is not an MPI function but a brief description of how each routine is structured.
MPI_Scan MPI_SCAN	MPI_SCAN, MPI_Scan	Collective Communication	Performs a parallel prefix reduction on data distributed across a group.
MPI_Scatter MPI_SCATTER	MPI_SCATTER, MPI_Scatter	Collective Communication	Distributes individual messages from root to each task in comm.
MPI_Scatterv MPI_SCATTERV	MPI_SCATTERV, MPI_Scatterv	Collective Communication	Distributes individual messages from root to each task in comm. Messages can have different sizes and displacements.
MPI_Send MPI_SEND	MPI_SEND, MPI_Send	Point-to-Point	Blocking standard mode send.
MPI_Send_init MPI_SEND_INIT	MPI_SEND_INIT, MPI_Send_init	Point-to-Point	Creates a persistent standard mode send request.
MPI_Sendrecv MPI_SENDRECV	MPI_SENDRECV, MPI_Sendrecv	Point-to-Point	A blocking send and receive operation.
MPI_Sendrecv_replace MPI_SENDRECV_REPLACE	MPI_SENDRECV_REPLACE, MPI_Sendrecv_replace	Point-to-Point	Blocking send and receive operation using a common buffer.
MPI_Ssend MPI_SSEND	MPI_SSEND, MPI_Ssend	Point-to-Point	Blocking synchronous mode send.
MPI_Ssend_init MPI_SSEND_INIT	MPI_SSEND_INIT, MPI_Ssend_init	Point-to-Point	Creates a persistent synchronous mode send request.
MPI_Start MPI_START	MPI_START, MPI_Start	Point-to-Point	Activates a persistent request operation.
MPI_Startall MPI_STARTALL	MPI_STARTALL, MPI_Startall	Point-to-Point	Activates a collection of persistent request operations.
MPI_Test MPI_TEST	MPI_TEST, MPI_Test	Point-to-Point File	Checks to see if a nonblocking operation has completed.
MPI_Test_cancelled MPI_TEST_CANCELLED	MPI_TEST_CANCELLED, MPI_Test_cancelled	Point-to-Point File	Tests whether a nonblocking operation was cancelled.
MPI_Testall MPI_TESTALL	MPI_TESTALL, MPI_Testall	Point-to-Point File	Tests a collection of nonblocking operations for completion.
MPI_Testany MPI_TESTANY	MPI_TESTANY, MPI_Testany	Point-to-Point File	Tests for the completion of any specified nonblocking operation.
MPI_Testsome MPI_TESTSOME	MPI_TESTSOME, MPI_Testsome	Point-to-Point File	Tests a collection of nonblocking operations for completion.
MPI_Topo_test MPI_TOPO_TEST	MPI_TOPO_TEST, MPI_Topo_test	Topology	Returns the type of virtual topology associated with a communicator.
MPI_Type_commit MPI_TYPE_COMMIT	MPI_TYPE_COMMIT, MPI_Type_commit	Derived Datatype	Makes a datatype ready for use in communications.
MPI_Type_contiguous MPI_TYPE_CONTIGUOUS	MPI_TYPE_CONTIGUOUS, MPI_Type_contiguous	Derived Datatype	Returns a new datatype that represents the concatenation of count instances of oldtype.
MPI_Type_create_darray MPI_TYPE_CREATE_DARRAY	MPI_TYPE_CREATE_DARRAY, MPI_Type_create_darray	Derived Datatype	Generates the datatypes corresponding to an HPF-like distribution of an ndims-dimensional array of oldtype elements onto an ndims-dimensional grid of logical tasks.
MPI_Type_create_subarray MPI_TYPE_CREATE_SUBARRAY	MPI_TYPE_CREATE_SUBARRAY, MPI_Type_create_subarray	Derived Datatype	Returns a new datatype that represents an ndims-dimensional subarray of an ndims-dimensional array.
MPI_Type_extent MPI_TYPE_EXTENT	MPI_TYPE_EXTENT, MPI_Type_extent	Derived Datatype	Returns the extent of any defined datatype.
MPI_Type_free MPI_TYPE_FREE	MPI_TYPE_FREE, MPI_Type_free	Derived Datatype	Marks a derived datatype for deallocation and sets its handle to MPI_DATATYPE_NULL.
MPI_Type_get_contents MPI_TYPE_GET_CONTENTS	MPI_TYPE_GET_CONTENTS, MPI_Type_get_contents	Derived Datatype	Obtains the arguments used in the creation of the datatype.
MPI_Type_get_envelope MPI_TYPE_GET_ENVELOPE	MPI_TYPE_GET_ENVELOPE, MPI_Type_get_envelope	Derived Datatype	Determines the constructor that was used to create the datatype.
MPI_Type_hindexed MPI_TYPE_HINDEXED	MPI_TYPE_HINDEXED, MPI_Type_hindexed	Derived Datatype	Returns a new datatype that represents count distinct blocks with offsets expressed in bytes.
MPI_Type_hvector MPI_TYPE_HVECTOR	MPI_TYPE_HVECTOR, MPI_Type_hvector	Derived Datatype	Returns a new datatype of count blocks with stride expressed in bytes.
MPI_Type_indexed MPI_TYPE_INDEXED	MPI_TYPE_INDEXED, MPI_Type_indexed	Derived Datatype	Returns a new datatype that represents count blocks with stride in terms of defining type.
MPI_Type_lb MPI_TYPE_LB	MPI_TYPE_LB, MPI_Type_lb	Derived Datatype	Returns the lower bound of a datatype.
MPI_Type_size MPI_TYPE_SIZE	MPI_TYPE_SIZE, MPI_Type_size	Derived Datatype	Returns the number of bytes represented by any defined datatype.
MPI_Type_struct MPI_TYPE_STRUCT	MPI_TYPE_STRUCT, MPI_Type_struct	Derived Datatype	Returns a new datatype that represents count blocks each with a distinct format and offset.
MPI_Type_ub MPI_TYPE_UB	MPI_TYPE_UB, MPI_Type_ub	Derived Datatype	Returns the upper bound of a datatype.
MPI_Type_vector MPI_TYPE_VECTOR	MPI_TYPE_VECTOR, MPI_Type_vector	Derived Datatype	Returns a new datatype that represents equally spaced blocks of replicated data.
MPI_Unpack MPI_UNPACK	MPI_UNPACK, MPI_Unpack	Derived Datatype	Unpacks the message into the specified receive buffer from the specified packed buffer.
MPI_Wait MPI_WAIT	MPI_WAIT, MPI_Wait	Point-to-Point File	Waits for a nonblocking operation to complete.
MPI_Waitall MPI_WAITALL	MPI_WAITALL, MPI_Waitall	Point-to-Point File	Waits for a collection of nonblocking operations to complete.
MPI_Waitany MPI_WAITANY	MPI_WAITANY, MPI_Waitany	Point-to-Point File	Waits for any specified nonblocking operation to complete.
MPI_Waitsome MPI_WAITSOME	MPI_WAITSOME, MPI_Waitsome	Point-to-Point File	Waits for at least one of a list of nonblocking operations to complete.
MPI_Wtick MPI_WTICK	MPI_WTICK, MPI_Wtick	Environment Management	Returns the resolution of MPI_Wtime in seconds.
MPI_Wtime MPI_WTIME	MPI_WTIME, MPI_Wtime	Environment Management	Returns the current value of time as a floating point value.