sion_cache.c File Reference

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "sion.h"
#include "sion_debug.h"
#include "sion_error_handler.h"
#include "sion_internal.h"
#include "sion_cache.h"

Include dependency graph for sion_cache.c:

Go to the source code of this file.

Functions
int	_sion_cache_check_env (_sion_filedesc *sion_filedesc)
	Check if environment variables are set to use cache. More...
int	_sion_cache_init (_sion_filedesc *sion_filedesc)
	Allocate and initalize the cache. More...
int	_sion_cache_destroy (_sion_filedesc *sion_filedesc)
	Deallocate the cache. More...
int	_sion_cache_create_linux (_sion_filedesc *sion_filedesc)
	Allocate cache for linux. More...
int	_sion_cache_load_linux (_sion_filedesc *sion_filedesc)
	Load an already allocated cache for linux. More...
int	_sion_cache_destroy_linux (_sion_filedesc *sion_filedesc)
	Deallocate cache for linux. More...

Detailed Description

This functions control and manage a memory based cache for sion files. Depending on a set of environment variables the cache will work as write-through or as write-back cache. On Unix systems a POSIX shared memory segment will be used, on Blue Gene/P it is persistent memory.

A cache of n MB will store the last n MB of data per task in the cache. If the cache memory is filled, the full cache will be written to disk and the cache will be exhausted.

Definition in file sion_cache.c.

Function Documentation

_sion_cache_check_env()

int _sion_cache_check_env

(

_sion_filedesc *

sion_filedesc

)

Check if environment variables are set to use cache.

Parameters

*sion_filedesc

sion file description struct (_sion_filedesc)

Returns

SION_SUCCESS if env could be checked

Definition at line 60 of file sion_cache.c.

_sion_cache_create_linux()

int _sion_cache_create_linux

(

_sion_filedesc *

sion_filedesc

)

Allocate cache for linux.

Parameters

*sion_filedesc

sion file description struct (_sion_filedesc)

Returns

SION_SUCCESS if ok

Definition at line 141 of file sion_cache.c.

_sion_cache_destroy()

int _sion_cache_destroy

(

_sion_filedesc *

sion_filedesc

)

Deallocate the cache.

Parameters

*sion_filedesc

sion file description struct (_sion_filedesc)

Returns

SION_SUCCESS if ok

Definition at line 118 of file sion_cache.c.

_sion_cache_destroy_linux()

int _sion_cache_destroy_linux

(

_sion_filedesc *

sion_filedesc

)

Deallocate cache for linux.

Parameters

*sion_filedesc

sion file description struct (_sion_filedesc)

Returns

1 if ok

Definition at line 232 of file sion_cache.c.

_sion_cache_init()

int _sion_cache_init

(

_sion_filedesc *

sion_filedesc

)

Allocate and initalize the cache.

Parameters

*sion_filedesc

sion file description struct (_sion_filedesc)

Returns

SION_SUCCESS if ok

Definition at line 82 of file sion_cache.c.

_sion_cache_load_linux()

int _sion_cache_load_linux

(

_sion_filedesc *

sion_filedesc

)

Load an already allocated cache for linux.

Parameters

*sion_filedesc

sion file description struct (_sion_filedesc)

Returns

SION_SUCCESS if ok

Definition at line 186 of file sion_cache.c.