papi_l1_dca.c

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/* This code attempts to test the L1 Data Cache Accesses    */
/* performance counter PAPI_L1_DCA              */

/* by Vince Weaver, <vincent.weaver@maine.edu>          */

/* Note on AMD fam15h we get 3x expected on writes? */


#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "papi.h"
#include "papi_test.h"

#include "testcode.h"
#include "display_error.h"

#define NUM_RUNS 100

#define ARRAYSIZE 65536

static double array[ARRAYSIZE];

int main(int argc, char **argv) {

    int i;
    int quiet;
    int eventset=PAPI_NULL;

    int errors=0;
    int retval;
    int num_runs=NUM_RUNS;
    long long high,low,average,expected=ARRAYSIZE;
    long long count,total;
    double aSumm = 0.0;
    double error;

    quiet=tests_quiet(argc,argv);

    if (!quiet) {
        printf("Testing the PAPI_L1_DCA event\n");
    }

    /* Init the PAPI library */
    retval = PAPI_library_init(PAPI_VER_CURRENT);
    if (retval != PAPI_VER_CURRENT) {
        test_fail(__FILE__,__LINE__,"PAPI_library_init",retval);
    }

    retval=PAPI_create_eventset(&eventset);
    if (retval!=PAPI_OK) {
        test_fail( __FILE__, __LINE__, "PAPI_create_eventset", retval );
    }

    retval=PAPI_add_named_event(eventset,"PAPI_L1_DCA");
    if (retval!=PAPI_OK) {
        test_skip( __FILE__, __LINE__, "adding PAPI_L1_DCA", retval );
    }


    /*******************************************************************/
    /* Test if the C compiler uses a sane number of data cache acceess */
    /* This tests writes to memory.                        */
    /*******************************************************************/

    if (!quiet) {
        printf("Write Test: Initializing an array of %d doubles:\n",
            ARRAYSIZE);
    }

    high=0; low=0; total=0;

    for(i=0;i<num_runs;i++) {

        PAPI_reset(eventset);
        PAPI_start(eventset);

        cache_write_test(array,ARRAYSIZE);

        retval=PAPI_stop(eventset,&count);

                if (retval!=PAPI_OK) {
                        test_fail( __FILE__, __LINE__,
                                "reading PAPI_L1_DCA", retval );
                }

                if (count>high) high=count;
                if ((low==0) || (count<low)) low=count;
                total+=count;
        }

        average=(total/num_runs);

    error=display_error(average,high,low,expected,quiet);

    if ((error > 1.0) || (error<-1.0)) {
        if (!quiet) printf("Instruction count off by more than 1%%\n");
        errors++;
    }

    if (!quiet) printf("\n");


    /*******************************************************************/
    /* Test if the C compiler uses a sane number of data cache acceess */
    /* This tests writes to memory.                        */
    /*******************************************************************/

    if (!quiet) {
        printf("Read Test:  Summing an array of %d doubles:\n",
            ARRAYSIZE);
    }

    high=0; low=0; total=0;

    for(i=0;i<num_runs;i++) {

        PAPI_reset(eventset);
        PAPI_start(eventset);


        aSumm+=cache_read_test(array,ARRAYSIZE);

        retval=PAPI_stop(eventset,&count);

                if (retval!=PAPI_OK) {
                        test_fail( __FILE__, __LINE__,
                                "reading PAPI_L1_DCA", retval );
                }

                if (count>high) high=count;
                if ((low==0) || (count<low)) low=count;
                total+=count;
        }

    if (!quiet) {
        printf("\tRead test sim= %lf\n",aSumm);
    }

        average=(total/num_runs);

    error=display_error(average,high,low,expected,quiet);

    if ((error > 1.0) || (error<-1.0)) {
        if (!quiet) printf("Instruction count off by more than 1%%\n");
        errors++;
    }

    if (!quiet) {
        printf("\n");
    }

    if (errors) {
        test_fail( __FILE__, __LINE__, "Error too high", 1 );
    }

    test_pass(__FILE__);

    return 0;
}