PAPI_get_hardware_info - Online Linux Manual PageSection : 3
Updated : September, 2004
Source : PAPI Programmer's Reference
Note : PAPI
NAMEPAPI_get_hardware_info − get information about the system hardware
SYNOPSISC Interface #include <papi.h>
const PAPI_hw_info_t *PAPI_get_hardware_info(void);Fortran Interface #include "fpapi.h"
PAPIF_get_hardware_info(C_INT ncpu, C_INT nnodes, C_INT totalcpus, C_INT vendor, C_STRING vendor_string, C_INT model, C_STRING model_string,C_FLOAT revision, C_FLOAT mhz)
DESCRIPTIONIn C, this function returns a pointer to a structure containing information about the hardware on which the program runs. In Fortran, the values of the structure are returned explicitly.
NOTEThe C structure contains detailed information about cache and TLB sizes. This information is not available from Fortran.
ARGUMENTSThe following arguments are implicit in the structure returned by the C function, or explicitly returned by Fortran. ncpu -- number of CPUs in an SMP Node nnodes -- number of Nodes in the entire system totalcpus -- total number of CPUs in the entire system vendor -- vendor id number of CPU vendor_string -- vendor id string of CPU model -- model number of CPU model_string -- model string of CPU revision -- Revision number of CPU mhz -- Cycle time of this CPU; *may* be an estimate generated at init time with a quick timing routine mem_hierarchy -- PAPI memory heirarchy description
RETURN VALUESOn success, the C function returns a non-NULL pointer, and the Fortran function returns PAPI_OK.
On error, NULL is returned by the C function, and a non-zero error code is returned by the Fortran function.
ERRORSPAPI_EINVAL" One or more of the arguments is invalid.
EXAMPLEconst PAPI_hw_info_t *hwinfo = NULL;
if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
exit(1);
if ((hwinfo = PAPI_get_hardware_info()) == NULL)
exit(1);
printf("%d CPU's at %f Mhz.\n",hwinfo->totalcpus,hwinfo->mhz);
DATA STRUCTUREThe C data structure returned by this function is found in papi.h and reproduced below: typedef struct _papi_mh_tlb_info {
int type; /* See papi.h for PAPI_MH definitions. */
int num_entries;
int associativity;
} PAPI_mh_tlb_info_t;
typedef struct _papi_mh_cache_info {
int type; /* See papi.h for PAPI_MH definitions. */
int size;
int line_size;
int num_lines;
int associativity;
} PAPI_mh_cache_info_t;
typedef struct _papi_mh_level_info {
PAPI_mh_tlb_info_t tlb[2];
PAPI_mh_cache_info_t cache[2];
} PAPI_mh_level_t;
typedef struct _papi_mh_info { /* mh for mem hierarchy maybe? */
int levels;
PAPI_mh_level_t level[PAPI_MAX_MEM_HIERARCHY_LEVELS];
} PAPI_mh_info_t;
typedef struct _papi_hw_info {
int ncpu; /* Number of CPU's in an SMP Node */
int nnodes; /* Number of Nodes in the entire system */
int totalcpus; /* Total number of CPU's in the entire system */
int vendor; /* Vendor number of CPU */
char vendor_string[PAPI_MAX_STR_LEN]; /* Vendor string of CPU */
int model; /* Model number of CPU */
char model_string[PAPI_MAX_STR_LEN]; /* Model string of CPU */
float revision; /* Revision of CPU */
float mhz; /* Cycle time of this CPU, *may* be estimated at
init time with a quick timing routine */
PAPI_mh_info_t mem_hierarchy; /* PAPI memory heirarchy description */
} PAPI_hw_info_t;
BUGSIf called before PAPI_library_init() the behavior of the routine is undefined.
SEE ALSOPAPI_library_init(3)," PAPI_get_dmem_info(3)," PAPI_get_opt(3)," PAPI_get_executable_info(3)" 0
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