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;
}