NAME

PAPI_set_cmp_granularity - Set the default counting granularity for eventsets bound to the specified component.

SYNOPSIS

Detailed Description

C Prototype:

#include <papi.h>
int PAPI_set_cmp_granularity( int granularity, int cidx );

Parameters

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

cidx An integer identifier for a component. By convention, component 0 is always the cpu component.

Return values

PAPI_OK
PAPI_EINVAL One or more of the arguments is invalid.
PAPI_ENOCMP The argument cidx is not a valid component.

PAPI_set_cmp_granularity sets the default counting granularity for all new event sets, and requires an explicit component argument. Event sets that are already in existence are not affected.

To change the granularity of an existing event set, please see PAPI_set_opt. The reader should note that the granularity of an event set affects only the mode in which the counter continues to run.

Example:

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_cmp_granularity(PAPI_GRN_PROC, 0);
if (ret != PAPI_OK) handle_error(ret);
ret = PAPI_create_eventset(&EventSet);
if (ret != PAPI_OK) handle_error(ret);

See also

PAPI_set_granularity PAPI_set_domain PAPI_set_opt PAPI_get_opt

Author

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