Open (and close) SIONlib files from multiple MPI processes in parallel. More...

Typedefs
typedef struct sion_mpi_options	sion_mpi_options
	Holds non-essential arguments for `sion_paropen_mpi()`. More...

typedef struct _sion_file_check_par_args_mpi_struct	sion_file_check_par_args_mpi

Functions
int	sion_paropen_mpi (const char filename, sion_open_mode mode, MPI_Comm communicator, const sion_mpi_options options)
	Open a SIONlib file from multiple MPI processes. More...

int	sion_parclose_mpi (int sid)
	Close a SIONlib file using MPI. More...

int	sion_parreinit_mpi (int sid, int64_t chunksize)

int	sion_paropen_mapped_mpi (char fname, const char file_mode, int numFiles, MPI_Comm gComm, int nlocaltasks, int globalranks, int64_t chunksizes, int mapping_filenrs, int mapping_lranks, int32_t fsblksize, FILE *fileptr)

int	sion_parclose_mapped_mpi (int sid)

sion_file_check_par_args_mpi *	sion_file_check_par_args_init_mpi (sion_open_mode mode, MPI_Comm communicator, const sion_mpi_options *options)

void	sion_file_check_par_args_free_mpi (sion_file_check_par_args_mpi *args)

int	sion_file_check_par_cb_mpi (char fname, void args)

sion_mpi_options *	sion_mpi_options_new ()
	Allocates and initializes an instance of `sion_mpi_options` More...

void	sion_mpi_options_delete (sion_mpi_options *options)
	Delete an instance of `sion_mpi_options` More...

void	sion_mpi_options_set_chunksize (sion_mpi_options *options, int64_t chunksize)
	Set the chunk size of a logical file in the container. More...

void	sion_mpi_options_set_fsblksize (sion_mpi_options *options, int32_t fsblksize)
	Set the file system block size to assume. More...

void	sion_mpi_options_set_multifile_number (sion_mpi_options *options, int multifile_number)
	Set the number of physical files to use. More...

void	sion_mpi_options_set_multifile_communicator (sion_mpi_options *options, MPI_Comm multifile_communicator)
	Create multiple physical files based on disjunct communicators. More...

void	sion_mpi_options_set_keyval_mode (sion_mpi_options *options, sion_keyval_mode keyval_mode)
	Set the key-value mode to use for a container. More...

void	sion_mpi_options_set_buddy (sion_mpi_options *options)
	Enable buddy checkpointing mechanism. More...

void	sion_mpi_options_set_buddylevel (sion_mpi_options *options, int32_t buddylevel)
	Enable buddy checkpointing mechanism. More...

void	sion_mpi_options_set_collective (sion_mpi_options *options)
	Enable collective I/O. More...

void	sion_mpi_options_set_collective_size (sion_mpi_options *options, int32_t size)
	Enable collective I/O. More...

void	sion_mpi_options_set_collective_merge (sion_mpi_options *options)
	Use collective merging. More...

void	sion_mpi_options_set_lowlevel_api (sion_mpi_options *options, sion_lowlevel_api lowlevel_api)
	Set the low-level API to use for opening a container. More...

void	sion_mpi_options_set_endianness (sion_mpi_options *options, sion_endianness endianness)
	Set the endianness for the contents of a container. More...

Detailed Description

Open (and close) SIONlib files from multiple MPI processes in parallel.

Typedef Documentation

◆ sion_mpi_options

typedef struct sion_mpi_options sion_mpi_options

Holds non-essential arguments for sion_paropen_mpi().

These are:

the sizes of chunks for the logical file opened by this task,
the size of a file system block to assume,
whether and in what mode to use SIONlib's key-value mechanism,
whether to use the buddy redundancy mechanism,
whether to use collective I/O,
what low-level API to use for file system access,
the endianness of user data in the file,
how many files to use.

Definition at line 44 of file sion_mpi.h.

Function Documentation

◆ sion_mpi_options_delete()

void sion_mpi_options_delete ( sion_mpi_options * options )

Delete an instance of sion_mpi_options

Parameters

[in] options a pointer to the instance to delete

Definition at line 170 of file sion_mpi_gen.c.

◆ sion_mpi_options_new()

sion_mpi_options* sion_mpi_options_new ( )

Allocates and initializes an instance of sion_mpi_options

Returns: a pointer to the new instance or NULL if allocation failed

Definition at line 161 of file sion_mpi_gen.c.

◆ sion_mpi_options_set_buddy()

void sion_mpi_options_set_buddy ( sion_mpi_options * options )

Enable buddy checkpointing mechanism.

Has the same effect as sion_generic_options_set_buddylevel(options, 1).

See also: resiliency

Parameters

[in] options an options object

Definition at line 202 of file sion_mpi_gen.c.

References sion_mpi_options_set_buddylevel().

◆ sion_mpi_options_set_buddylevel()

void sion_mpi_options_set_buddylevel	(	sion_mpi_options *	options,
		int32_t	buddylevel
	)

Enable buddy checkpointing mechanism.

Enables a specific level of buddy redundancy.

See also: resiliency

Parameters

[in]	options	an options object
[in]	buddylevel	the level of redundancy to use

Definition at line 207 of file sion_mpi_gen.c.

References sion_generic_options_set_buddylevel().

Referenced by sion_mpi_options_set_buddy().

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◆ sion_mpi_options_set_chunksize()

void sion_mpi_options_set_chunksize	(	sion_mpi_options *	options,
		int64_t	chunksize
	)

Set the chunk size of a logical file in the container.

Parameters

[in,out]	options	an options object
[in]	chunksize	chunk sizes for the logical file opened by this process

Definition at line 175 of file sion_mpi_gen.c.

References sion_generic_options_set_chunksize().

◆ sion_mpi_options_set_collective()

void sion_mpi_options_set_collective ( sion_mpi_options * options )

Enable collective I/O.

The size of collector groups will be determined via heuristics.

See also: Collective API

Parameters

[in] options an options object

Definition at line 212 of file sion_mpi_gen.c.

References sion_mpi_options_set_collective_size().

◆ sion_mpi_options_set_collective_merge()

void sion_mpi_options_set_collective_merge ( sion_mpi_options * options )

Use collective merging.

See also: Collective API

Parameters

[in] options an options object

Definition at line 222 of file sion_mpi_gen.c.

References sion_generic_options_set_collective_merge().

◆ sion_mpi_options_set_collective_size()

void sion_mpi_options_set_collective_size	(	sion_mpi_options *	options,
		int32_t	size
	)

Enable collective I/O.

See also: Collective API

Parameters

[in]	options	an options object
[in]	size	size of the collector groups

Definition at line 217 of file sion_mpi_gen.c.

References sion_generic_options_set_collective_size().

Referenced by sion_mpi_options_set_collective().

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◆ sion_mpi_options_set_endianness()

void sion_mpi_options_set_endianness	(	sion_mpi_options *	options,
		sion_endianness	endianness
	)

Set the endianness for the contents of a container.

Parameters

[in,out]	options	an options object
[in]	endianness	the endianness of the contents

Definition at line 232 of file sion_mpi_gen.c.

References sion_generic_options_set_endianness().

◆ sion_mpi_options_set_fsblksize()

void sion_mpi_options_set_fsblksize	(	sion_mpi_options *	options,
		int32_t	fsblksize
	)

Set the file system block size to assume.

Parameters

[in,out]	options	an options object
[in]	fsblksize	the file system block size

Definition at line 180 of file sion_mpi_gen.c.

References sion_generic_options_set_fsblksize().

◆ sion_mpi_options_set_keyval_mode()

void sion_mpi_options_set_keyval_mode	(	sion_mpi_options *	options,
		sion_keyval_mode	keyval_mode
	)

Set the key-value mode to use for a container.

Parameters

[in,out]	options	an options object
[in]	keyval_mode	the key-value mode to use

Definition at line 197 of file sion_mpi_gen.c.

References sion_generic_options_set_keyval_mode().

◆ sion_mpi_options_set_lowlevel_api()

void sion_mpi_options_set_lowlevel_api	(	sion_mpi_options *	options,
		sion_lowlevel_api	lowlevel_api
	)

Set the low-level API to use for opening a container.

Parameters

[in,out]	options	an options object
[in]	lowlevel_api	the low-level API to use

Definition at line 227 of file sion_mpi_gen.c.

References sion_generic_options_set_lowlevel_api().

◆ sion_mpi_options_set_multifile_communicator()

void sion_mpi_options_set_multifile_communicator	(	sion_mpi_options *	options,
		MPI_Comm	multifile_communicator
	)

Create multiple physical files based on disjunct communicators.

A separate physical file will be created for every distinct communicator. The union of all the different communicators should be the communicator passed to sion_paropen_mpi().

Parameters

[in,out]	options	an options object
[in]	multifile_communicator

Definition at line 191 of file sion_mpi_gen.c.

◆ sion_mpi_options_set_multifile_number()

void sion_mpi_options_set_multifile_number	(	sion_mpi_options *	options,
		int	multifile_number
	)

Set the number of physical files to use.

Parameters

[in,out]	options	an options object
[in]	multifile_number	how many files to use

Definition at line 185 of file sion_mpi_gen.c.

◆ sion_parclose_mpi()

int sion_parclose_mpi ( int sid )

Close a SIONlib file using MPI.

Uses sion_generic_parclose() internally.

Parameters

[in] sid SIONlib file handle

Returns: success value (SION_SUCCESS or SION_NOT_SUCCESS)

Examples: simple/sionpar.c.

Definition at line 34 of file sion_mpi_gen.c.

◆ sion_paropen_mpi()

int sion_paropen_mpi	(	const char *	filename,
		sion_open_mode	mode,
		MPI_Comm	communicator,
		const sion_mpi_options *	options
	)

Open a SIONlib file from multiple MPI processes.

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

Parameters

[in]	filename	name of the file (must match on all processes)
[in]	mode	what mode to open the file in
[in]	communicator	a communicator containing all processes that call this function
[in]	options	additional options or `NULL`

Returns: SIONlib file handle or -1 if an error occurred

Examples: simple/sionpar.c.

Definition at line 237 of file sion_mpi_gen.c.

Typedefs

Functions

Detailed Description

Typedef Documentation

◆ sion_mpi_options

Function Documentation

◆ sion_mpi_options_delete()

◆ sion_mpi_options_new()

◆ sion_mpi_options_set_buddy()

◆ sion_mpi_options_set_buddylevel()

◆ sion_mpi_options_set_chunksize()

◆ sion_mpi_options_set_collective()

◆ sion_mpi_options_set_collective_merge()

◆ sion_mpi_options_set_collective_size()

◆ sion_mpi_options_set_endianness()

◆ sion_mpi_options_set_fsblksize()

◆ sion_mpi_options_set_keyval_mode()

◆ sion_mpi_options_set_lowlevel_api()

◆ sion_mpi_options_set_multifile_communicator()

◆ sion_mpi_options_set_multifile_number()

◆ sion_parclose_mpi()

◆ sion_paropen_mpi()