nm_mpi_collective.h File Reference

declarations for MPI collectives More...

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Functions: Collective communications
typedef void	MPI_User_function(void *invec, void *inoutvec, int *len, MPI_Datatype *datatype)
	User combination function for reduction. More...
typedef void	MPI_User_function_c(void *invec, void *inoutvec, MPI_Count *len, MPI_Datatype *datatype)
int	MPI_Barrier (MPI_Comm comm)
	Blocks the caller until all group members have called the routine. More...
int	MPI_Ibarrier (MPI_Comm comm, MPI_Request *request)
int	MPI_Bcast (void *buffer, int count, MPI_Datatype datatype, int root, MPI_Comm comm)
	Broadcasts a message from the process with rank root to all processes of the group, itself included. More...
int	MPI_Bcast_c (void *buffer, MPI_Count count, MPI_Datatype datatype, int root, MPI_Comm comm)
int	MPI_Ibcast (void *buffer, int count, MPI_Datatype datatype, int root, MPI_Comm comm, MPI_Request *request)
int	MPI_Ibcast_c (void *buffer, MPI_Count count, MPI_Datatype datatype, int root, MPI_Comm comm, MPI_Request *request)
int	MPI_Gather (const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm)
	Each process sends the contents of its send buffer to the root process. More...
int	MPI_Gather_c (const void *sendbuf, MPI_Count sendcount, MPI_Datatype sendtype, void *recvbuf, MPI_Count recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm)
int	MPI_Igather (const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm, MPI_Request *request)
int	MPI_Igather_c (const void *sendbuf, MPI_Count sendcount, MPI_Datatype sendtype, void *recvbuf, MPI_Count recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm, MPI_Request *request)
int	MPI_Gatherv (const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, const int recvcounts[], const int displs[], MPI_Datatype recvtype, int root, MPI_Comm comm)
	Extends the functionality of MPI_Gather() by allowing a varying count of data. More...
int	MPI_Gatherv_c (const void *sendbuf, MPI_Count sendcount, MPI_Datatype sendtype, void *recvbuf, const MPI_Count recvcounts[], const MPI_Aint displs[], MPI_Datatype recvtype, int root, MPI_Comm comm)
int	MPI_Allgather (const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, MPI_Comm comm)
	Extends the functionality of MPI_Gather(), except all processes receive the result. More...
int	MPI_Allgather_c (const void *sendbuf, MPI_Count sendcount, MPI_Datatype sendtype, void *recvbuf, MPI_Count recvcount, MPI_Datatype recvtype, MPI_Comm comm)
int	MPI_Iallgather (const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, MPI_Comm comm, MPI_Request *request)
int	MPI_Iallgather_c (const void *sendbuf, MPI_Count sendcount, MPI_Datatype sendtype, void *recvbuf, MPI_Count recvcount, MPI_Datatype recvtype, MPI_Comm comm, MPI_Request *request)
int	MPI_Allgatherv (const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, const int recvcounts[], const int displs[], MPI_Datatype recvtype, MPI_Comm comm)
	Extends the functionality of MPI_Gatherv(), except all processes receive the result. More...
int	MPI_Allgatherv_c (const void *sendbuf, MPI_Count sendcount, MPI_Datatype sendtype, void *recvbuf, const MPI_Count recvcounts[], const MPI_Aint displs[], MPI_Datatype recvtype, MPI_Comm comm)
int	MPI_Scatter (const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm)
	Inverse operation of MPI_Gather() More...
int	MPI_Scatter_c (const void *sendbuf, MPI_Count sendcount, MPI_Datatype sendtype, void *recvbuf, MPI_Count recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm)
int	MPI_Scatterv (const void *sendbuf, const int sendcounts[], const int displs[], MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm)
int	MPI_Scatterv_c (const void *sendbuf, const MPI_Count sendcounts[], const MPI_Aint displs[], MPI_Datatype sendtype, void *recvbuf, MPI_Count recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm)
int	MPI_Alltoall (const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvType, MPI_Comm comm)
	Extension of MPI_Allgather() to the case where each process sends distinct data to each of the receivers. More...
int	MPI_Alltoall_c (const void *sendbuf, MPI_Count sendcount, MPI_Datatype sendtype, void *recvbuf, MPI_Count recvcount, MPI_Datatype recvType, MPI_Comm comm)
int	MPI_Ialltoall (const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvType, MPI_Comm comm, MPI_Request *request)
int	MPI_Ialltoall_c (const void *sendbuf, MPI_Count sendcount, MPI_Datatype sendtype, void *recvbuf, MPI_Count recvcount, MPI_Datatype recvType, MPI_Comm comm, MPI_Request *request)
int	MPI_Alltoallv (const void *sendbuf, const int sendcounts[], const int sdispls[], MPI_Datatype sendtype, void *recvbuf, const int recvcounts[], const int rdispls[], MPI_Datatype recvType, MPI_Comm comm)
	Adds flexibility to MPI_Alltoall() in that the location of data for the send is specified by sdispls and the location of the placement of the data on the receive side is specified by rdispls. More...
int	MPI_Alltoallv_c (const void *sendbuf, const MPI_Count sendcounts[], const MPI_Aint sdispls[], MPI_Datatype sendtype, void *recvbuf, const MPI_Count recvcounts[], const MPI_Aint rdispls[], MPI_Datatype recvType, MPI_Comm comm)
int	MPI_Ialltoallv (const void *sendbuf, const int sendcounts[], const int sdispls[], MPI_Datatype sendtype, void *recvbuf, const int recvcounts[], const int rdispls[], MPI_Datatype recvtype, MPI_Comm comm, MPI_Request *request)
int	MPI_Ialltoallv_c (const void *sendbuf, const MPI_Count sendcounts[], const MPI_Aint sdispls[], MPI_Datatype sendtype, void *recvbuf, const MPI_Count recvcounts[], const MPI_Aint rdispls[], MPI_Datatype recvtype, MPI_Comm comm, MPI_Request *request)
int	MPI_Op_create (MPI_User_function *function, int commute, MPI_Op *op)
	Binds a user-defined global operation to an op handle that can subsequently used in a global reduction operation. More...
int	MPI_Op_create_c (MPI_User_function_c *function, int commute, MPI_Op *op)
int	MPI_Op_free (MPI_Op *op)
	Marks a user-defined reduction operation for deallocation. More...
int	MPI_Reduce (const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm)
	Combines the elements provided in the input buffer of each process in the group, using the operation op, and returns the combined value in the output buffer of the process with rank root. More...
int	MPI_Reduce_c (const void *sendbuf, void *recvbuf, MPI_Count count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm)
int	MPI_Reduce_local (const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op)
int	MPI_Reduce_local_c (const void *sendbuf, void *recvbuf, MPI_Count count, MPI_Datatype datatype, MPI_Op op)
int	MPI_Ireduce (const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm, MPI_Request *request)
int	MPI_Ireduce_c (const void *sendbuf, void *recvbuf, MPI_Count count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm, MPI_Request *request)
int	MPI_Scan (const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
int	MPI_Scan_c (const void *sendbuf, void *recvbuf, MPI_Count count, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
int	MPI_Allreduce (const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
	Combines the elements provided in the input buffer of each process in the group, using the operation op, and returns the combined value in the output buffer of each process in the group. More...
int	MPI_Allreduce_c (const void *sendbuf, void *recvbuf, MPI_Count count, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
int	MPI_Iallreduce (const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm, MPI_Request *request)
int	MPI_Iallreduce_c (const void *sendbuf, void *recvbuf, MPI_Count count, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm, MPI_Request *request)
int	MPI_Reduce_scatter (const void *sendbuf, void *recvbuf, const int recvcounts[], MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
	First does an element-wise reduction on vector of elements in the send buffer defined by sendbuf, count and datatype. More...
int	MPI_Reduce_scatter_c (const void *sendbuf, void *recvbuf, const MPI_Count recvcounts[], MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)

Detailed Description

declarations for MPI collectives

Definition in file nm_mpi_collective.h.

Typedef Documentation

MPI_User_function

typedef void MPI_User_function(void *invec, void *inoutvec, int *len, MPI_Datatype *datatype)

User combination function for reduction.

Definition at line 33 of file nm_mpi_collective.h.

MPI_User_function_c

typedef void MPI_User_function_c(void *invec, void *inoutvec, MPI_Count *len, MPI_Datatype *datatype)

Definition at line 35 of file nm_mpi_collective.h.

Function Documentation

MPI_Allgather()

int MPI_Allgather	(	const void *	sendbuf,
		int	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		int	recvcount,
		MPI_Datatype	recvtype,
		MPI_Comm	comm
	)

Extends the functionality of MPI_Gather(), except all processes receive the result.

Parameters

sendbuf	starting address of send buffer
sendcount	number of elements in send buffer
sendtype	data type of send buffer elements
recvbuf	address of receive buffer
recvcount	number of elements received from any process
recvtype	data type of receive buffer elements
comm	communicator

Returns

MPI status

MPI_Allgather_c()

int MPI_Allgather_c	(	const void *	sendbuf,
		MPI_Count	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		MPI_Count	recvcount,
		MPI_Datatype	recvtype,
		MPI_Comm	comm
	)

MPI_Allgatherv()

int MPI_Allgatherv	(	const void *	sendbuf,
		int	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		const int	recvcounts[],
		const int	displs[],
		MPI_Datatype	recvtype,
		MPI_Comm	comm
	)

Extends the functionality of MPI_Gatherv(), except all processes receive the result.

Parameters

sendbuf	starting address of send buffer
sendcount	number of elements in send buffer
sendtype	data type of send buffer elements
recvbuf	address of receive buffer
recvcounts	integer array
displs	integer array
recvtype	data type of receive buffer elements
comm	communicator

Returns

MPI status

MPI_Allgatherv_c()

int MPI_Allgatherv_c	(	const void *	sendbuf,
		MPI_Count	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		const MPI_Count	recvcounts[],
		const MPI_Aint	displs[],
		MPI_Datatype	recvtype,
		MPI_Comm	comm
	)

MPI_Allreduce()

int MPI_Allreduce	(	const void *	sendbuf,
		void *	recvbuf,
		int	count,
		MPI_Datatype	datatype,
		MPI_Op	op,
		MPI_Comm	comm
	)

Combines the elements provided in the input buffer of each process in the group, using the operation op, and returns the combined value in the output buffer of each process in the group.

Parameters

sendbuf	starting address of send buffer
recvbuf	starting address of receive buffer
count	number of elements in send buffer
datatype	data type of elements of send buffer
op	operation
comm	communicator

Returns

MPI status

MPI_Allreduce_c()

int MPI_Allreduce_c	(	const void *	sendbuf,
		void *	recvbuf,
		MPI_Count	count,
		MPI_Datatype	datatype,
		MPI_Op	op,
		MPI_Comm	comm
	)

MPI_Alltoall()

int MPI_Alltoall	(	const void *	sendbuf,
		int	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		int	recvcount,
		MPI_Datatype	recvType,
		MPI_Comm	comm
	)

Extension of MPI_Allgather() to the case where each process sends distinct data to each of the receivers.

The jth block sent from process i is received by process j and is placed in the ith block of recvbuf.

Parameters

sendbuf	starting address of send buffer
sendcount	number of elements sent to each process
sendtype	data type of send buffer elements
recvbuf	address of receive buffer
recvcount	number of elements received from any process
recvType	data type of receive buffer elements
comm	communicator

Returns

MPI status

MPI_Alltoall_c()

int MPI_Alltoall_c	(	const void *	sendbuf,
		MPI_Count	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		MPI_Count	recvcount,
		MPI_Datatype	recvType,
		MPI_Comm	comm
	)

MPI_Alltoallv()

int MPI_Alltoallv	(	const void *	sendbuf,
		const int	sendcounts[],
		const int	sdispls[],
		MPI_Datatype	sendtype,
		void *	recvbuf,
		const int	recvcounts[],
		const int	rdispls[],
		MPI_Datatype	recvType,
		MPI_Comm	comm
	)

Adds flexibility to MPI_Alltoall() in that the location of data for the send is specified by sdispls and the location of the placement of the data on the receive side is specified by rdispls.

Parameters

sendbuf	starting address of send buffer
sendcount	integer array equal to the group size specifying the number of elements to send to each processor
sdispls	integer array of length group size. Entry j specifies the displacement relative to sendbuf from which to take the outgoing data destined for process j
sendtype	data type of send buffer elements
recvbuf	address of receive buffer
recvcount	integer array equal to the group size specifying the number of elements that can be received from each processor
recvdispls	integer array
recvType	data type of receive buffer elements
comm	communicator

Returns

MPI status

MPI_Alltoallv_c()

int MPI_Alltoallv_c	(	const void *	sendbuf,
		const MPI_Count	sendcounts[],
		const MPI_Aint	sdispls[],
		MPI_Datatype	sendtype,
		void *	recvbuf,
		const MPI_Count	recvcounts[],
		const MPI_Aint	rdispls[],
		MPI_Datatype	recvType,
		MPI_Comm	comm
	)

MPI_Barrier()

int MPI_Barrier

(

MPI_Comm

comm

)

Blocks the caller until all group members have called the routine.

Parameters

comm	communicator

Returns

MPI status

MPI_Bcast()

int MPI_Bcast	(	void *	buffer,
		int	count,
		MPI_Datatype	datatype,
		int	root,
		MPI_Comm	comm
	)

Broadcasts a message from the process with rank root to all processes of the group, itself included.

Parameters

buffer	starting address of buffer
count	number of entries in buffer
datatype	data type of buffer
root	rank of broadcast root
comm	communicator

Returns

MPI status

MPI_Bcast_c()

int MPI_Bcast_c	(	void *	buffer,
		MPI_Count	count,
		MPI_Datatype	datatype,
		int	root,
		MPI_Comm	comm
	)

MPI_Gather()

int MPI_Gather	(	const void *	sendbuf,
		int	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		int	recvcount,
		MPI_Datatype	recvtype,
		int	root,
		MPI_Comm	comm
	)

Each process sends the contents of its send buffer to the root process.

Parameters

sendbuf	starting address of send buffer
sendcount	number of elements in send buffer
sendtype	data type of send buffer elements
recvbuf	address of receive buffer
recvcount	number of elements for any single receive
recvtype	data type of recv buffer elements
root	rank of receiving process
comm	communicator

Returns

MPI status

MPI_Gather_c()

int MPI_Gather_c	(	const void *	sendbuf,
		MPI_Count	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		MPI_Count	recvcount,
		MPI_Datatype	recvtype,
		int	root,
		MPI_Comm	comm
	)

MPI_Gatherv()

int MPI_Gatherv	(	const void *	sendbuf,
		int	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		const int	recvcounts[],
		const int	displs[],
		MPI_Datatype	recvtype,
		int	root,
		MPI_Comm	comm
	)

Extends the functionality of MPI_Gather() by allowing a varying count of data.

Parameters

sendbuf	starting address of send buffer
sendcount	number of elements in send buffer
sendtype	data type of send buffer elements
recvbuf	address of receive buffer (significant only at root)
recvcounts	integer array of length group size containing the number of elements that are received from each process (significant only at root)
displs	integer array of length group size. Entry i specifies the displacement relative to recvbuf at which to place the incoming data from process i (significant only at root)
recvtype	data type of recv buffer elements (significant only at root)
root	rank of receiving process
comm	communicator

Returns

MPI status

MPI_Gatherv_c()

int MPI_Gatherv_c	(	const void *	sendbuf,
		MPI_Count	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		const MPI_Count	recvcounts[],
		const MPI_Aint	displs[],
		MPI_Datatype	recvtype,
		int	root,
		MPI_Comm	comm
	)

MPI_Iallgather()

int MPI_Iallgather	(	const void *	sendbuf,
		int	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		int	recvcount,
		MPI_Datatype	recvtype,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Iallgather_c()

int MPI_Iallgather_c	(	const void *	sendbuf,
		MPI_Count	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		MPI_Count	recvcount,
		MPI_Datatype	recvtype,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Iallreduce()

int MPI_Iallreduce	(	const void *	sendbuf,
		void *	recvbuf,
		int	count,
		MPI_Datatype	datatype,
		MPI_Op	op,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Iallreduce_c()

int MPI_Iallreduce_c	(	const void *	sendbuf,
		void *	recvbuf,
		MPI_Count	count,
		MPI_Datatype	datatype,
		MPI_Op	op,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Ialltoall()

int MPI_Ialltoall	(	const void *	sendbuf,
		int	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		int	recvcount,
		MPI_Datatype	recvType,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Ialltoall_c()

int MPI_Ialltoall_c	(	const void *	sendbuf,
		MPI_Count	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		MPI_Count	recvcount,
		MPI_Datatype	recvType,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Ialltoallv()

int MPI_Ialltoallv	(	const void *	sendbuf,
		const int	sendcounts[],
		const int	sdispls[],
		MPI_Datatype	sendtype,
		void *	recvbuf,
		const int	recvcounts[],
		const int	rdispls[],
		MPI_Datatype	recvtype,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Ialltoallv_c()

int MPI_Ialltoallv_c	(	const void *	sendbuf,
		const MPI_Count	sendcounts[],
		const MPI_Aint	sdispls[],
		MPI_Datatype	sendtype,
		void *	recvbuf,
		const MPI_Count	recvcounts[],
		const MPI_Aint	rdispls[],
		MPI_Datatype	recvtype,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Ibarrier()

int MPI_Ibarrier	(	MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Ibcast()

int MPI_Ibcast	(	void *	buffer,
		int	count,
		MPI_Datatype	datatype,
		int	root,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Ibcast_c()

int MPI_Ibcast_c	(	void *	buffer,
		MPI_Count	count,
		MPI_Datatype	datatype,
		int	root,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Igather()

int MPI_Igather	(	const void *	sendbuf,
		int	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		int	recvcount,
		MPI_Datatype	recvtype,
		int	root,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Igather_c()

int MPI_Igather_c	(	const void *	sendbuf,
		MPI_Count	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		MPI_Count	recvcount,
		MPI_Datatype	recvtype,
		int	root,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Ireduce()

int MPI_Ireduce	(	const void *	sendbuf,
		void *	recvbuf,
		int	count,
		MPI_Datatype	datatype,
		MPI_Op	op,
		int	root,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Ireduce_c()

int MPI_Ireduce_c	(	const void *	sendbuf,
		void *	recvbuf,
		MPI_Count	count,
		MPI_Datatype	datatype,
		MPI_Op	op,
		int	root,
		MPI_Comm	comm,
		MPI_Request *	request
	)

MPI_Op_create()

int MPI_Op_create	(	MPI_User_function *	function,
		int	commute,
		MPI_Op *	op
	)

Binds a user-defined global operation to an op handle that can subsequently used in a global reduction operation.

Parameters

function	user defined function
commute	true if commutative; false otherwise
op	operation

Returns

MPI status

MPI_Op_create_c()

int MPI_Op_create_c	(	MPI_User_function_c *	function,
		int	commute,
		MPI_Op *	op
	)

MPI_Op_free()

int MPI_Op_free

(

MPI_Op *

op

)

Marks a user-defined reduction operation for deallocation.

Parameters

op	operation to be freed

Returns

MPI status

MPI_Reduce()

int MPI_Reduce	(	const void *	sendbuf,
		void *	recvbuf,
		int	count,
		MPI_Datatype	datatype,
		MPI_Op	op,
		int	root,
		MPI_Comm	comm
	)

Combines the elements provided in the input buffer of each process in the group, using the operation op, and returns the combined value in the output buffer of the process with rank root.

Parameters

sendbuf	address of send buffer
recvbuf	address of receive buffer
count	number of elements in send buffer
datatype	data type of elements of send buffer
op	reduce operation
root	rank of root process
comm	communicator

Returns

MPI status

MPI_Reduce_c()

int MPI_Reduce_c	(	const void *	sendbuf,
		void *	recvbuf,
		MPI_Count	count,
		MPI_Datatype	datatype,
		MPI_Op	op,
		int	root,
		MPI_Comm	comm
	)

MPI_Reduce_local()

int MPI_Reduce_local	(	const void *	sendbuf,
		void *	recvbuf,
		int	count,
		MPI_Datatype	datatype,
		MPI_Op	op
	)

MPI_Reduce_local_c()

int MPI_Reduce_local_c	(	const void *	sendbuf,
		void *	recvbuf,
		MPI_Count	count,
		MPI_Datatype	datatype,
		MPI_Op	op
	)

MPI_Reduce_scatter()

int MPI_Reduce_scatter	(	const void *	sendbuf,
		void *	recvbuf,
		const int	recvcounts[],
		MPI_Datatype	datatype,
		MPI_Op	op,
		MPI_Comm	comm
	)

First does an element-wise reduction on vector of elements in the send buffer defined by sendbuf, count and datatype.

Next, the resulting vector of results is split into n disjoint segments, where n is the number of members in the group. Segment i contains recvcounts[i] elements. The ith segment is sent to process i and stored in the receive buffer defined by recvbuf, recvcounts[i] and datatype.

Parameters

sendbuf	starting address of send buffer
recvbuf	starting address of receive buffer
recvcounts	integer array specifying the number of elements in result distributed to each process. Array must be identical on all calling processes
datatype	data type of elements of input buffer
op	operation
comm	communicator

Returns

MPI status

MPI_Reduce_scatter_c()

int MPI_Reduce_scatter_c	(	const void *	sendbuf,
		void *	recvbuf,
		const MPI_Count	recvcounts[],
		MPI_Datatype	datatype,
		MPI_Op	op,
		MPI_Comm	comm
	)

MPI_Scan()

int MPI_Scan	(	const void *	sendbuf,
		void *	recvbuf,
		int	count,
		MPI_Datatype	datatype,
		MPI_Op	op,
		MPI_Comm	comm
	)

MPI_Scan_c()

int MPI_Scan_c	(	const void *	sendbuf,
		void *	recvbuf,
		MPI_Count	count,
		MPI_Datatype	datatype,
		MPI_Op	op,
		MPI_Comm	comm
	)

MPI_Scatter()

int MPI_Scatter	(	const void *	sendbuf,
		int	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		int	recvcount,
		MPI_Datatype	recvtype,
		int	root,
		MPI_Comm	comm
	)

Inverse operation of MPI_Gather()

Parameters

sendbuf	address of send buffer
sendcount	number of elements sent to each process
sendtype	data type of send buffer elements
recvbuf	address of receive buffer
recvcount	number of elements in receive buffer
recvtype	data type of receive buffer elements
root	rank of sending process
comm	communicator

Returns

MPI status

MPI_Scatter_c()

int MPI_Scatter_c	(	const void *	sendbuf,
		MPI_Count	sendcount,
		MPI_Datatype	sendtype,
		void *	recvbuf,
		MPI_Count	recvcount,
		MPI_Datatype	recvtype,
		int	root,
		MPI_Comm	comm
	)

MPI_Scatterv()

int MPI_Scatterv	(	const void *	sendbuf,
		const int	sendcounts[],
		const int	displs[],
		MPI_Datatype	sendtype,
		void *	recvbuf,
		int	recvcount,
		MPI_Datatype	recvtype,
		int	root,
		MPI_Comm	comm
	)

MPI_Scatterv_c()

int MPI_Scatterv_c	(	const void *	sendbuf,
		const MPI_Count	sendcounts[],
		const MPI_Aint	displs[],
		MPI_Datatype	sendtype,
		void *	recvbuf,
		MPI_Count	recvcount,
		MPI_Datatype	recvtype,
		int	root,
		MPI_Comm	comm
	)