#include <papi.h>
int PAPI_set_granularity( int granularity );

-- granularity one of the following constants as defined in the papi.h header file

• PAPI_GRN_THR -- Count each individual thread
• PAPI_GRN_PROC -- Count each individual process
• PAPI_GRN_PROCG -- Count each individual process group
• PAPI_GRN_SYS -- Count the current CPU
• PAPI_GRN_SYS_CPU -- Count all CPUs individually
• PAPI_GRN_MIN -- The finest available granularity
• PAPI_GRN_MAX -- The coarsest available granularity

PAPI_OK
PAPI_EINVAL One or more of the arguments is invalid.

int ret;
// Initialize the library
ret = PAPI_library_init(PAPI_VER_CURRENT);
if (ret > 0 && ret != PAPI_VER_CURRENT) {


  fprintf(stderr,"PAPI library version mismatch!\n");


  exit(1); 
}
if (ret < 0) handle_error(ret);
// Set the default granularity for the cpu component
ret = PAPI_set_granularity(PAPI_GRN_PROC);
if (ret != PAPI_OK) handle_error(ret);
ret = PAPI_create_eventset(&EventSet);
if (ret != PAPI_OK) handle_error(ret);

PAPI_set_cmp_granularity PAPI_set_domain PAPI_set_opt PAPI_get_opt