PAPI 的使用。

                                                                                                                
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//#include "papi.h"
#include "/home/zxx/papi-4.2.0/src/papi.h"
#include <stdlib.h>
#include <stdio.h>

int main() {

    int EventSet;
        int i, sum;
    long_long values[1], values1[1], values2[1];

    /* Initialize the PAPI library */
    if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
                exit(-1);
      //  exit(-1);

    /* Create an EventSet */
    EventSet = PAPI_NULL;
    if (PAPI_create_eventset(&EventSet) != PAPI_OK)
        exit(-1);

    /* Add an event about Total Instructions Executed (PAPI_TOT_INS) to EventSet */
    if (PAPI_add_event(EventSet, PAPI_TOT_INS) != PAPI_OK)
        exit(-1);

    /* Start counting events */
    if (PAPI_start(EventSet) != PAPI_OK)
        exit(-1);

    /* Read counters before workload running*/
    if (PAPI_read(EventSet, values1) != PAPI_OK)
        exit(-1);

    /* Do some computation here */
        for (i=0;i<10000;i++)
                sum+=i;

    /* Stop counting events */
    /* Stop counting events */
    if (PAPI_stop(EventSet, values2) != PAPI_OK)
        exit(-1);


    /* Clean up EventSet */
    if (PAPI_cleanup_eventset(EventSet) != PAPI_OK)
        exit(-1);

    /* Destroy the EventSet */
    if (PAPI_destroy_eventset(&EventSet) != PAPI_OK)
        exit(-1);

    /* Shutdown PAPI */
    PAPI_shutdown();
    /* Get value */
 //   values[0] = values2[0] – values1[0];
        values[0]=values2[0]-values1[0];
        printf("%d\n",values[0]);
        return 0;
}
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