/******************************************************************************
* This is a simple low level function demonstration on using PAPI_add_events *
* to add an array of events to a created eventset, we are going to use these *
* events to monitor a set of instructions, start the counters, read the *
* counters and then cleanup the eventset when done. In this example we use *
* the presets PAPI_TOT_INS and PAPI_TOT_CYC. PAPI_add_events,PAPI_start, *
* PAPI_stop, PAPI_clean_eventset, PAPI_destroy_eventset and *
* PAPI_create_eventset all return PAPI_OK(which is 0) when succesful. *
******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include "papi.h" /* This needs to be included every time you use PAPI */
#define NUM_EVENT 2
#define THRESHOLD 100000
#define ERROR_RETURN(retval) { fprintf(stderr, "Error %d %s:line %d: \n", retval,__FILE__,__LINE__); exit(retval); }
int main(){
int i,retval,tmp;
int EventSet = PAPI_NULL;
/*must be initialized to PAPI_NULL before calling PAPI_create_event*/
int event_codes[NUM_EVENT]={PAPI_TOT_INS,PAPI_TOT_CYC};
char errstring[PAPI_MAX_STR_LEN];
long long values[NUM_EVENT];
/***************************************************************************
* This part initializes the library and compares the version number of the *
* header file, to the version of the library, if these don't match then it *
* is likely that PAPI won't work correctly.If there is an error, retval *
* keeps track of the version number. *
****************************************************************************/
if((retval = PAPI_library_init(PAPI_VER_CURRENT)) != PAPI_VER_CURRENT )
{
fprintf(stderr, "Error: %s\n", errstring);
exit(1);
}
/* Creating event set */
if ((retval=PAPI_create_eventset(&EventSet)) != PAPI_OK)
ERROR_RETURN(retval);
/* Add the array of events PAPI_TOT_INS and PAPI_TOT_CYC to the eventset*/
if ((retval=PAPI_add_events(EventSet, event_codes, NUM_EVENT)) != PAPI_OK)
ERROR_RETURN(retval);
/* Start counting */
if ( (retval=PAPI_start(EventSet)) != PAPI_OK)
ERROR_RETURN(retval);
/*** this is where your computation goes *********/
for(i=0;i<1000;i++)
{
tmp = tmp+i;
}
/* Stop counting, this reads from the counter as well as stop it. */
if ( (retval=PAPI_stop(EventSet,values)) != PAPI_OK)
ERROR_RETURN(retval);
printf("\nThe total instructions executed are %lld, total cycles %lld\n",
values[0],values[1]);
if ( (retval=PAPI_remove_events(EventSet,event_codes, NUM_EVENT))!=PAPI_OK)
ERROR_RETURN(retval);
/* Free all memory and data structures, EventSet must be empty. */
if ( (retval=PAPI_destroy_eventset(&EventSet)) != PAPI_OK)
ERROR_RETURN(retval);
/* free the resources used by PAPI */
PAPI_shutdown();
exit(0);
}