Provide a consistent MPI interface with and without MPI configured. More...

#include <sc_config.h>
#include <sc3_mpi_types.h>

Include dependency graph for sc_mpi.h:

This graph shows which files directly or indirectly include this file:

Data Structures
struct	sc_MPI_Status
	Replacement of `MPI_Status` for non-MPI configuration. More...

struct	sc_no_mpiio_file
	Replacement structure for `MPI_File`. More...

Macros
#define	sc_MPI_SUCCESS SC3_MPI_SUCCESS
	Emulate `SC_MPI_SUCCESS`.

#define	sc_MPI_ERR_ARG SC3_MPI_ERR_ARG
	Emulate `SC_MPI_ERR_ARG`.

#define	sc_MPI_ERR_COUNT SC3_MPI_ERR_COUNT
	Emulate `SC_MPI_ERR_COUNT`.

#define	sc_MPI_ERR_UNKNOWN SC3_MPI_ERR_UNKNOWN
	Emulate `SC_MPI_ERR_UNKNOWN`.

#define	sc_MPI_ERR_OTHER SC3_MPI_ERR_OTHER
	Emulate `SC_MPI_ERR_OTHER`.

#define	sc_MPI_ERR_NO_MEM SC3_MPI_ERR_NO_MEM
	Emulate `SC_MPI_ERR_NO_MEM`.

#define	sc_MPI_ERR_FILE SC3_MPI_ERR_FILE
	Emulate `SC_MPI_ERR_FILE`.

#define	sc_MPI_ERR_NOT_SAME SC3_MPI_ERR_NOT_SAME
	Emulate `SC_MPI_ERR_NOT_SAME`.

#define	sc_MPI_ERR_AMODE SC3_MPI_ERR_AMODE
	Emulate `SC_MPI_ERR_AMODE` .

#define	sc_MPI_ERR_UNSUPPORTED_DATAREP SC3_MPI_ERR_UNSUPPORTED_DATAREP
	Emulate `SC_MPI_ERR_UNSUPPORTED_DATAREP`.

#define	sc_MPI_ERR_UNSUPPORTED_OPERATION SC3_MPI_ERR_UNSUPPORTED_OPERATION
	Emulate `SC_MPI_ERR_UNSUPPORTED_OPERATION`.

#define	sc_MPI_ERR_NO_SUCH_FILE SC3_MPI_ERR_NO_SUCH_FILE
	Emulate `SC_MPI_ERR_NO_SUCH_FILE`.

#define	sc_MPI_ERR_FILE_EXISTS SC3_MPI_ERR_FILE_EXISTS
	Emulate `SC_MPI_ERR_FILE_EXISTS`.

#define	sc_MPI_ERR_BAD_FILE SC3_MPI_ERR_BAD_FILE
	Emulate `SC_MPI_ERR_BAD_FILE`.

#define	sc_MPI_ERR_ACCESS SC3_MPI_ERR_ACCESS
	Emulate `SC_MPI_ERR_ACCESS`.

#define	sc_MPI_ERR_NO_SPACE SC3_MPI_ERR_NO_SPACE
	Emulate `SC_MPI_ERR_NO_SPACE`.

#define	sc_MPI_ERR_QUOTA SC3_MPI_ERR_QUOTA
	Emulate `SC_MPI_ERR_QUOTA`.

#define	sc_MPI_ERR_READ_ONLY SC3_MPI_ERR_READ_ONLY
	Emulate `SC_MPI_ERR_READ_ONLY`.

#define	sc_MPI_ERR_FILE_IN_USE SC3_MPI_ERR_FILE_IN_USE
	Emulate `SC_MPI_ERR_FILE_IN_USE`.

#define	sc_MPI_ERR_DUP_DATAREP SC3_MPI_ERR_DUP_DATAREP
	Emulate `SC_MPI_ERR_DUP_DATAREP`.

#define	sc_MPI_ERR_CONVERSION SC3_MPI_ERR_CONVERSION
	Emulate `SC_MPI_ERR_CONVERSION`.

#define	sc_MPI_ERR_IO SC3_MPI_ERR_IO
	Emulate `SC_MPI_ERR_IO`.

#define	sc_MPI_ERR_LASTCODE SC3_MPI_ERR_LASTCODE
	Emulate `SC_MPI_ERR_LASTCODE`.

#define	sc_MPI_MAX_ERROR_STRING SC3_MPI_MAX_ERROR_STRING
	Emulate `MPI_MAX_ERROR_STRING`.

#define	sc_MPI_COMM_NULL SC3_MPI_COMM_NULL
	Emulate the null communicator.

#define	sc_MPI_COMM_WORLD SC3_MPI_COMM_WORLD
	Emulate the world communicator.

#define	sc_MPI_COMM_SELF SC3_MPI_COMM_SELF
	Emulate the self communicator.

#define	sc_MPI_GROUP_NULL ((sc_MPI_Group) 0x54000000) /* TODO change val */
	Emulate the null group. More...

#define	sc_MPI_GROUP_EMPTY ((sc_MPI_Group) 0x54000001) /* TODO change val */
	Emulate the empty group. More...

#define	sc_MPI_MIN SC3_MPI_MIN
	Minimum operator.

#define	sc_MPI_MAX SC3_MPI_MAX
	Maximum operator.

#define	sc_MPI_SUM SC3_MPI_SUM
	Summation operator.

#define	sc_MPI_UNDEFINED SC3_MPI_UNDEFINED
	Emulate `MPI_UNDEFINED`.

#define	sc_MPI_INFO_NULL NULL
	Emulate null Info.

#define	sc_MPI_COMM_TYPE_SHARED sc_MPI_UNDEFINED

#define	sc_MPI_FILE_NULL NULL
	The null MPI file.

Typedefs
typedef int	sc_MPI_Group
	Emulate an MPI group.

typedef int	sc_MPI_Request
	Emulate an MPI request.

typedef sc3_MPI_Comm_t	sc_MPI_Comm
	Emulate an MPI communicator.

typedef sc3_MPI_Info_t	sc_MPI_Info
	Emulate an MPI Info object.

typedef sc3_MPI_Datatype_t	sc_MPI_Datatype
	Emulate MPI datatypes.

typedef sc3_MPI_Op_t	sc_MPI_Op
	Emulate MPI operations.

typedef struct sc_MPI_Status	sc_MPI_Status
	Replacement of `MPI_Status` for non-MPI configuration.

typedef long	sc_MPI_Offset
	Emulate the MPI offset type.

typedef struct sc_no_mpiio_file *	sc_MPI_File
	Replacement object for an MPI file.

Enumerations
enum	sc_tag_t { SC_TAG_FIRST = 's' + 'c' , SC_TAG_AG_ALLTOALL = SC_TAG_FIRST , SC_TAG_AG_RECURSIVE_A , SC_TAG_AG_RECURSIVE_B , SC_TAG_AG_RECURSIVE_C , SC_TAG_NOTIFY_CENSUS , SC_TAG_NOTIFY_CENSUSV , SC_TAG_NOTIFY_NBX , SC_TAG_NOTIFY_NBXV , SC_TAG_NOTIFY_WRAPPER , SC_TAG_NOTIFY_WRAPPERV , SC_TAG_NOTIFY_RANGES , SC_TAG_NOTIFY_PAYLOAD , SC_TAG_NOTIFY_SUPER_TRUE , SC_TAG_NOTIFY_SUPER_EXTRA , SC_TAG_NOTIFY_RECURSIVE , SC_TAG_NOTIFY_NARY = SC_TAG_NOTIFY_RECURSIVE + 32 , SC_TAG_REDUCE = SC_TAG_NOTIFY_NARY + 32 , SC_TAG_PSORT_LO , SC_TAG_PSORT_HI , SC_TAG_LAST }
	Enumerate all MPI tags used internally to the sc library. More...

Functions
int	sc_mpi_is_enabled (void)
	Return whether MPI is configured. More...

int	sc_mpi_is_shared (void)
	Return whether MPI supports type split and shared windows. More...

int	sc_MPI_Init (int argc, char **argv)
	MPI initialization. More...

int	sc_MPI_Finalize (void)
	MPI finalization.

int	sc_MPI_Abort (sc_MPI_Comm mpicomm, int ecode)
	Abort an MPI program. More...

int	sc_MPI_Comm_dup (sc_MPI_Comm mpicomm, sc_MPI_Comm *dupcomm)
	Duplicate an MPI communicator. More...

int	sc_MPI_Comm_free (sc_MPI_Comm *freecomm)
	Free a previously created MPI communicator. More...

int	sc_MPI_Type_size (sc_MPI_Datatype datatype, int *size)
	Return size of an MPI datatype. More...

int	sc_MPI_Pack (const void inbuf, int incount, sc_MPI_Datatype datatype, void outbuf, int outsize, int *position, sc_MPI_Comm comm)
	Pack several instances of the same datatype into contiguous memory. More...

int	sc_MPI_Unpack (const void inbuf, int insize, int position, void *outbuf, int outcount, sc_MPI_Datatype datatype, sc_MPI_Comm comm)
	Unpack contiguous memory into several instances of the same datatype. More...

int	sc_MPI_Pack_size (int incount, sc_MPI_Datatype datatype, sc_MPI_Comm comm, int *size)
	Determine space needed to pack several instances of the same datatype. More...

int	sc_MPI_Comm_size (sc_MPI_Comm mpicomm, int *mpisize)
	Query size of an MPI communicator. More...

int	sc_MPI_Comm_rank (sc_MPI_Comm mpicomm, int *mpirank)
	Query rank of an MPI process within a communicator. More...

int	sc_MPI_Group_size (sc_MPI_Group mpigroup, int *size)
	Query size of an MPI group. More...

int	sc_MPI_Group_rank (sc_MPI_Group mpigroup, int *rank)
	Query rank of an MPI process within a group. More...

int	sc_MPI_Barrier (sc_MPI_Comm mpicomm)
	Execute a parallel barrier. More...

int	sc_MPI_Bcast (void *, int, sc_MPI_Datatype, int, sc_MPI_Comm)
	Execute the MPI_Bcast algorithm.

int	sc_MPI_Gather (void , int, sc_MPI_Datatype, void , int, sc_MPI_Datatype, int, sc_MPI_Comm)

int	sc_MPI_Gatherv (void , int, sc_MPI_Datatype, void , int , int , sc_MPI_Datatype, int, sc_MPI_Comm)

int	sc_MPI_Allgather (void , int, sc_MPI_Datatype, void , int, sc_MPI_Datatype, sc_MPI_Comm)
	Execute the MPI_Allgather algorithm.

int	sc_MPI_Allgatherv (void , int, sc_MPI_Datatype, void , int , int , sc_MPI_Datatype, sc_MPI_Comm)
	Execute the MPI_Allgatherv algorithm.

int	sc_MPI_Alltoall (void , int, sc_MPI_Datatype, void , int, sc_MPI_Datatype, sc_MPI_Comm)
	Execute the MPI_Alltoall algorithm.

int	sc_MPI_Reduce (void , void , int, sc_MPI_Datatype, sc_MPI_Op, int, sc_MPI_Comm)
	Execute the MPI_Reduce algorithm.

int	sc_MPI_Reduce_scatter_block (void , void , int, sc_MPI_Datatype, sc_MPI_Op, sc_MPI_Comm)

int	sc_MPI_Allreduce (void , void , int, sc_MPI_Datatype, sc_MPI_Op, sc_MPI_Comm)
	Execute the MPI_Allreduce algorithm.

int	sc_MPI_Scan (void , void , int, sc_MPI_Datatype, sc_MPI_Op, sc_MPI_Comm)
	Execute the MPI_Scan algorithm.

int	sc_MPI_Exscan (void , void , int, sc_MPI_Datatype, sc_MPI_Op, sc_MPI_Comm)
	Execute the MPI_Exscan algorithm.

sc_MPI_Aint	sc_MPI_Aint_diff (sc_MPI_Aint a, sc_MPI_Aint b)

double	sc_MPI_Wtime (void)
	Execute the MPI_Wtime function. More...

int	sc_MPI_Comm_split (sc_MPI_Comm, int, int, sc_MPI_Comm *)
	Return the input communicator in lieu of splitting. More...

int	sc_MPI_Comm_create (sc_MPI_Comm, sc_MPI_Group, sc_MPI_Comm *)

int	sc_MPI_Comm_compare (sc_MPI_Comm, sc_MPI_Comm, int *)

int	sc_MPI_Comm_group (sc_MPI_Comm, sc_MPI_Group *)

int	sc_MPI_Group_free (sc_MPI_Group *)

int	sc_MPI_Group_translate_ranks (sc_MPI_Group, int, int , sc_MPI_Group, int )

int	sc_MPI_Group_compare (sc_MPI_Group, sc_MPI_Group, int *)

int	sc_MPI_Group_union (sc_MPI_Group, sc_MPI_Group, sc_MPI_Group *)

int	sc_MPI_Group_intersection (sc_MPI_Group, sc_MPI_Group, sc_MPI_Group *)

int	sc_MPI_Group_difference (sc_MPI_Group, sc_MPI_Group, sc_MPI_Group *)

int	sc_MPI_Group_incl (sc_MPI_Group, int, int , sc_MPI_Group )

int	sc_MPI_Group_excl (sc_MPI_Group, int, int , sc_MPI_Group )

int	sc_MPI_Group_range_incl (sc_MPI_Group, int, int ranges[][3], sc_MPI_Group *)

int	sc_MPI_Group_range_excl (sc_MPI_Group, int, int ranges[][3], sc_MPI_Group *)

int	sc_MPI_Recv (void , int, sc_MPI_Datatype, int, int, sc_MPI_Comm, sc_MPI_Status )

int	sc_MPI_Irecv (void , int, sc_MPI_Datatype, int, int, sc_MPI_Comm, sc_MPI_Request )

int	sc_MPI_Send (void *, int, sc_MPI_Datatype, int, int, sc_MPI_Comm)

int	sc_MPI_Isend (void , int, sc_MPI_Datatype, int, int, sc_MPI_Comm, sc_MPI_Request )

int	sc_MPI_Probe (int, int, sc_MPI_Comm, sc_MPI_Status *)

int	sc_MPI_Iprobe (int, int, sc_MPI_Comm, int , sc_MPI_Status )

int	sc_MPI_Get_count (sc_MPI_Status , sc_MPI_Datatype, int )

int	sc_MPI_Wait (sc_MPI_Request , sc_MPI_Status )

int	sc_MPI_Waitsome (int, sc_MPI_Request , int , int , sc_MPI_Status )

int	sc_MPI_Waitall (int, sc_MPI_Request , sc_MPI_Status )

int	sc_MPI_Testall (int, sc_MPI_Request , int , sc_MPI_Status *)

int	sc_MPI_Comm_split_type (sc_MPI_Comm mpicomm, int split_type, int key, sc_MPI_Info info, sc_MPI_Comm *newcomm)
	Wrapper to split an MPI communicator by shared node type. More...

int	sc_MPI_Init_thread (int argc, char *argv, int required, int provided)

int	sc_MPI_Error_class (int errorcode, int *errorclass)
	Turn an MPI error code into its error class. More...

int	sc_MPI_Error_string (int errorcode, char string, int resultlen)
	Turn MPI error code into a string. More...

size_t	sc_mpi_sizeof (sc_MPI_Datatype t)
	Return the size of MPI datatypes. More...

Detailed Description

Provide a consistent MPI interface with and without MPI configured.

When MPI is configured, we redefine many MPI functions and objects. Without MPI, we emulate collective MPI routines to work as expected.

The goal is to make code compile and execute cleanly when --enable-mpi is not given on the configure line. To this end, several MPI routines that are meaningful to call on one processor are provided with the prefix sc_MPI_, as well as necessary types and defines. If --enable-mpi is given, this file provides macros that map the sc_-prefixed form to the standard form of the symbols.

When including this file in your code, everything inside #ifdef SC_ENABLE_MPI may as well use the standard MPI API. Outside of this definition block, the sc_MPI_* routines specified here are allow to seamlessly use MPI calls without breaking non-MPI code.

Some send and receive routines are wrapped. They can thus be used in code outside of #ifdef SC_ENABLE_MPI even though they will abort. If no messages are sent to the same processor when mpisize == 1, such aborts will not occur. The MPI_Wait* routines are safe to call as long as no or only MPI_REQUEST_NULL requests are passed in.

Macro Definition Documentation

◆ sc_MPI_GROUP_EMPTY

#define sc_MPI_GROUP_EMPTY ((sc_MPI_Group) 0x54000001) /* TODO change val */

Emulate the empty group.

Group operations are not supported without MPI.

◆ sc_MPI_GROUP_NULL

#define sc_MPI_GROUP_NULL ((sc_MPI_Group) 0x54000000) /* TODO change val */

Emulate the null group.

Group operations are not supported without MPI.

Enumeration Type Documentation

◆ sc_tag_t

enum sc_tag_t

Enumerate all MPI tags used internally to the sc library.

Enumerator
SC_TAG_FIRST	Anything really.
SC_TAG_AG_ALLTOALL	Used in MPI alltoall replacement.
SC_TAG_AG_RECURSIVE_A	Internal tag; do not use.
SC_TAG_AG_RECURSIVE_B	Internal tag; do not use.
SC_TAG_AG_RECURSIVE_C	Internal tag; do not use.
SC_TAG_NOTIFY_CENSUS	Internal tag to sc_notify.
SC_TAG_NOTIFY_CENSUSV	Internal tag to sc_notify.
SC_TAG_NOTIFY_NBX	Internal tag to sc_notify.
SC_TAG_NOTIFY_NBXV	Internal tag to sc_notify.
SC_TAG_NOTIFY_WRAPPER	Internal tag to sc_notify.
SC_TAG_NOTIFY_WRAPPERV	Internal tag to sc_notify.
SC_TAG_NOTIFY_RANGES	Internal tag to sc_notify.
SC_TAG_NOTIFY_PAYLOAD	Internal tag to sc_notify.
SC_TAG_NOTIFY_SUPER_TRUE	Internal tag to sc_notify.
SC_TAG_NOTIFY_SUPER_EXTRA	Internal tag to sc_notify.
SC_TAG_NOTIFY_RECURSIVE	Internal tag to sc_notify.
SC_TAG_NOTIFY_NARY	Internal tag to sc_notify.
SC_TAG_REDUCE	Used in MPI reduce replacement.
SC_TAG_PSORT_LO	Internal tag to sc_psort.
SC_TAG_PSORT_HI	Internal tag to sc_psort.
SC_TAG_LAST	End marker of tag enumeration.

Function Documentation

◆ sc_MPI_Abort()

int sc_MPI_Abort	(	sc_MPI_Comm	mpicomm,
		int	ecode
	)

Abort an MPI program.

Parameters

[in]	mpicomm	Communicator across which to abort.
[in]	ecode	Error code returned to the system.

◆ sc_MPI_Barrier()

int sc_MPI_Barrier ( sc_MPI_Comm mpicomm )

Execute a parallel barrier.

Parameters

[in] mpicomm Valid communicator.

◆ sc_MPI_Comm_dup()

int sc_MPI_Comm_dup	(	sc_MPI_Comm	mpicomm,
		sc_MPI_Comm *	dupcomm
	)

Duplicate an MPI communicator.

Parameters

[in]	mpicomm	Communicator to duplicate.
[out]	dupcomm	Duplicated communicator.

◆ sc_MPI_Comm_free()

int sc_MPI_Comm_free ( sc_MPI_Comm * freecomm )

Free a previously created MPI communicator.

Parameters

[out] freecomm Communicator to free.

◆ sc_MPI_Comm_rank()

int sc_MPI_Comm_rank	(	sc_MPI_Comm	mpicomm,
		int *	mpirank
	)

Query rank of an MPI process within a communicator.

Parameters

[in]	mpicomm	Valid MPI communicator.
[out]	mpirank	Without MPI this is always 0.

Examples: options.c.

◆ sc_MPI_Comm_size()

int sc_MPI_Comm_size	(	sc_MPI_Comm	mpicomm,
		int *	mpisize
	)

Query size of an MPI communicator.

Parameters

[in]	mpicomm	Valid MPI communicator.
[out]	mpisize	Without MPI this is always 1.

◆ sc_MPI_Comm_split()

int sc_MPI_Comm_split	(	sc_MPI_Comm	,
		int	,
		int	,
		sc_MPI_Comm *
	)

Return the input communicator in lieu of splitting.

Returns: MPI_SUCCESS.

◆ sc_MPI_Comm_split_type()

int sc_MPI_Comm_split_type	(	sc_MPI_Comm	mpicomm,
		int	split_type,
		int	key,
		sc_MPI_Info	info,
		sc_MPI_Comm *	newcomm
	)

Wrapper to split an MPI communicator by shared node type.

With MPI and MPICOMMSHARED enabled, call MPI_Comm_split type. Otherwise, call sc_MPI_Comm_split with the rank as color and key. Without MPI, the latter falls back to duplicate the communicator.

◆ sc_MPI_Error_class()

int sc_MPI_Error_class	(	int	errorcode,
		int *	errorclass
	)

Turn an MPI error code into its error class.

When MPI is enabled, we pass version 1.1 errors to MPI_Error_class. When MPI I/O is not enabled, we process file errors outside of MPI. Thus, within libsc, it is always legal to call this function with any errorcode defined above in this header file.

Parameters

[in]	errorcode	Returned from a direct MPI call or libsc.
[out]	errorclass	Non-NULL pointer. Filled with matching error class on success.

Returns: sc_MPI_SUCCESS on successful conversion, Other MPI error code otherwise.

◆ sc_MPI_Error_string()

int sc_MPI_Error_string	(	int	errorcode,
		char *	string,
		int *	resultlen
	)

Turn MPI error code into a string.

Parameters

[in]	errorcode	This (MPI) error code is converted.
[in,out]	string	At least sc_MPI_MAX_ERROR_STRING bytes.
[out]	resultlen	Length of string on return.

Returns: sc_MPI_SUCCESS on success or other MPI error cocde on invalid arguments.

◆ sc_MPI_Group_rank()

int sc_MPI_Group_rank	(	sc_MPI_Group	mpigroup,
		int *	rank
	)

Query rank of an MPI process within a group.

Parameters

[in]	mpigroup	Valid MPI group.
[out]	rank	Without MPI this is always 0.

◆ sc_MPI_Group_size()

int sc_MPI_Group_size	(	sc_MPI_Group	mpigroup,
		int *	size
	)

Query size of an MPI group.

Parameters

[in]	mpigroup	Valid MPI group.
[out]	size	Without MPI this is always 1.

◆ sc_MPI_Init()

int sc_MPI_Init	(	int *	argc,
		char ***	argv
	)

MPI initialization.

Parameters

[in,out]	argc	Command line argument count.
[in,out]	argv	Command line arguments.

Examples: options.c.

◆ sc_mpi_is_enabled()

int sc_mpi_is_enabled ( void )

Return whether MPI is configured.

Returns: Boolean corresponding to define SC_ENABLE_MPI.

◆ sc_mpi_is_shared()

int sc_mpi_is_shared ( void )

Return whether MPI supports type split and shared windows.

Returns: Boolean corresponding to #define SC_ENABLE_MPISHARED.

◆ sc_MPI_Pack()

int sc_MPI_Pack	(	const void *	inbuf,
		int	incount,
		sc_MPI_Datatype	datatype,
		void *	outbuf,
		int	outsize,
		int *	position,
		sc_MPI_Comm	comm
	)

Pack several instances of the same datatype into contiguous memory.

Parameters

[in]	inbuf	Buffer of elements of type datatype.
[in]	incount	Number of elements in inbuf.
[in]	datatype	Datatype of elements in inbuf.
[out]	outbuf	Output buffer in which elements are packed.
[in]	outsize	Size of output buffer in bytes.
[in,out]	position	The current position in the output buffer.
[in]	comm	Valid MPI communicator.

Returns: MPI_SUCCESS on success.

◆ sc_MPI_Pack_size()

int sc_MPI_Pack_size	(	int	incount,
		sc_MPI_Datatype	datatype,
		sc_MPI_Comm	comm,
		int *	size
	)

Determine space needed to pack several instances of the same datatype.

Parameters

[in]	incount	Number of elements to pack.
[in]	datatype	Datatype of elements to pack.
[in]	comm	Valid MPI communicator.
[out]	size	Number of bytes needed to packed incount instances of datatype.

Returns: MPI_SUCCESS on success.

◆ sc_mpi_sizeof()

size_t sc_mpi_sizeof ( sc_MPI_Datatype t )

Return the size of MPI datatypes.

Parameters

[in] t MPI datatype.

Returns: Returns the size in bytes.

◆ sc_MPI_Type_size()

int sc_MPI_Type_size	(	sc_MPI_Datatype	datatype,
		int *	size
	)

Return size of an MPI datatype.

Parameters

[in]	datatype	Valid MPI datatype.
[out]	size	Size of MPI datatype in bytes.

Returns: MPI_SUCCESS on success.

◆ sc_MPI_Unpack()

int sc_MPI_Unpack	(	const void *	inbuf,
		int	insize,
		int *	position,
		void *	outbuf,
		int	outcount,
		sc_MPI_Datatype	datatype,
		sc_MPI_Comm	comm
	)

Unpack contiguous memory into several instances of the same datatype.

Parameters

[in]	inbuf	Buffer of packed data.
[in]	insize	Number of bytes in inbuf
[in,out]	position	The current position in the input buffer.
[out]	outbuf	Output buffer in which elements are unpacked.
[in]	outcount	Number of elements to unpack.
[in]	datatype	Datatype of elements to be unpacked.
[in]	comm	Valid MPI communicator.

Returns: MPI_SUCCESS on success.

◆ sc_MPI_Wtime()

double sc_MPI_Wtime ( void )

Execute the MPI_Wtime function.

Returns: Number of seconds since the epoch.

Data Structures

Macros

Typedefs

Enumerations

Functions

Detailed Description

Macro Definition Documentation

◆ sc_MPI_GROUP_EMPTY

◆ sc_MPI_GROUP_NULL

Enumeration Type Documentation

◆ sc_tag_t

Function Documentation

◆ sc_MPI_Abort()

◆ sc_MPI_Barrier()

◆ sc_MPI_Comm_dup()

◆ sc_MPI_Comm_free()

◆ sc_MPI_Comm_rank()

◆ sc_MPI_Comm_size()

◆ sc_MPI_Comm_split()

◆ sc_MPI_Comm_split_type()

◆ sc_MPI_Error_class()

◆ sc_MPI_Error_string()

◆ sc_MPI_Group_rank()

◆ sc_MPI_Group_size()

◆ sc_MPI_Init()

◆ sc_mpi_is_enabled()

◆ sc_mpi_is_shared()

◆ sc_MPI_Pack()

◆ sc_MPI_Pack_size()

◆ sc_mpi_sizeof()

◆ sc_MPI_Type_size()

◆ sc_MPI_Unpack()

◆ sc_MPI_Wtime()