sion_mpi_gen.c File Reference

#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include "mpi.h"
#include "sion.h"
#include "sion_debug.h"
#include "sion_error_handler.h"
#include "sion_internal.h"
#include "sion_fd.h"
#include "sion_filedesc.h"
#include "sion_printts.h"
#include "sion_flags.h"
#include "sion_generic.h"
#include "sion_mpi.h"
#include "sion_mpi_internal_gen.h"
#include "sion_mpi_cb_gen.h"

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Macros
#define	_XOPEN_SOURCE   700

Functions
int	sion_paropen_mpi (const char *fname, const char *file_mode, int *numFiles, MPI_Comm gComm, const MPI_Comm *lComm, sion_int64 *chunksize, sion_int32 *fsblksize, int *globalrank, FILE **fileptr, char **newfname)
	Open a sion file using MPI. More...
int	sion_parclose_mpi (int sid)
	Close a sion file using MPI. More...
int	sion_parreinit_mpi (int sid, sion_int64 chunksize)
int	sion_paropen_mapped_mpi (char *fname, const char *file_mode, int *numFiles, MPI_Comm gComm, int *nlocaltasks, int **globalranks, sion_int64 **chunksizes, int **mapping_filenrs, int **mapping_lranks, sion_int32 *fsblksize, FILE **fileptr)
int	sion_parclose_mapped_mpi (int sid)

Variables
int	_sion_mpi_api_aid = -1

Detailed Description

MPI Implementation

Definition in file sion_mpi_gen.c.

Function Documentation

sion_parclose_mpi()

int sion_parclose_mpi

(

int

sid

)

Close a sion file using MPI.

For more description please see the description of sion_parclose_mpi.

Parameters

[in]

sid

sion file handle

Return values

success

value (SION_SUCCESS or SION_NOT_SUCCESS)

Definition at line 230 of file sion_mpi_gen.c.

Referenced by fsion_parclose_mpi_c().

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sion_paropen_mpi()

int sion_paropen_mpi	(	const char *	fname,
		const char *	file_mode,
		int *	numFiles,
		MPI_Comm	gComm,
		const MPI_Comm *	lComm,
		sion_int64 *	chunksize,
		sion_int32 *	fsblksize,
		int *	globalrank,
		FILE **	fileptr,
		char **	newfname
	)

Open a sion file using MPI.

This function opens a sion file using MPI. It processes the MPI specific parts and then passes its arguments on to sion_generic_paropen().

For more description please see the description of sion_paropen_mpi.

Parameters

[in]	fname	name of file, should be equal on all tasks
[in]	file_mode	like the type parameter of fopen. See file mode description for details
[in,out]	numFiles	number of multi files to use (-1 for automatic choosing from local communicator)
[in]	gComm	global MPI communicator (typically MPI_COMM_WORLD)
[in]	lComm	local MPI communicator (= gComm if no adaption to I/O nodes is needed) lComm should be a partition of gComm, i.e. a disjoint cover
[in,out]	chunksize	maximum size to be written with single write call
[in,out]	fsblksize	file system block size. Must be equal on all processes (-1 for automatic)
[in,out]	globalrank	global rank of process any globally unique id for current task. It will be stored in sion file. Useful if comm is not MPI_COMM_WORLD (typically: globalrank = rank in MPI_COMM_WORLD)
[out]	fileptr	file pointer (NULL for not using an external which allows for more optimisation)
[out]	newfname	return value for actual file name if using multi files. NULL does not return the name. If passed non NULL pointer the memory needs to be freed by the user.

Return values

sid	sion file handle or -1 if error occurred

Definition at line 85 of file sion_mpi_gen.c.

Referenced by fsion_paropen_mpi_c().

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