branches.c

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/*
 * $Id$
 *
 * Test example for branch accuracy and functionality, originally 
 * provided by Timothy Kaiser, SDSC. It was modified to fit the 
 * PAPI test suite by Nils Smeds, <smeds@pdc.kth.se>.
 * and Phil Mucci <mucci@cs.utk.edu>
 * This example verifies the accuracy of branch events
 */

#include "papi_test.h"
#include <stdio.h>
#include <math.h>

#define MAXEVENTS 4
#define SLEEPTIME 100
#define MINCOUNTS 100000

static double dummy3( double x, int iters );

int
main( int argc, char **argv )
{
    PAPI_event_info_t info;
    int i, j, retval;
    int iters = 10000000;
    double x = 1.1, y;
    long long t1, t2;
    long long values[MAXEVENTS], refvalues[MAXEVENTS];
    int sleep_time = SLEEPTIME;
    double spread[MAXEVENTS];
    int nevents = MAXEVENTS;
    int eventset = PAPI_NULL;
    int events[MAXEVENTS];

    events[0] = PAPI_BR_NTK;
    events[1] = PAPI_BR_PRC;
    events[2] = PAPI_BR_INS;
    events[3] = PAPI_BR_MSP;
/*
  events[3]=PAPI_BR_CN; 
  events[4]=PAPI_BR_UCN;*/
    /*events[5]=PAPI_BR_TKN; */


    for ( i = 0; i < MAXEVENTS; i++ ) {
        values[i] = 0;
    }

    if ( argc > 1 ) {
        if ( !strcmp( argv[1], "TESTS_QUIET" ) )
            tests_quiet( argc, argv );
        else {
            sleep_time = atoi( argv[1] );
            if ( sleep_time <= 0 )
                sleep_time = SLEEPTIME;
        }
    }

    if ( !TESTS_QUIET ) {
        printf( "\nAccuracy check of branch presets.\n" );
        printf( "Comparing a measurement with separate measurements.\n\n" );
    }

    if ( ( retval =
           PAPI_library_init( PAPI_VER_CURRENT ) ) != PAPI_VER_CURRENT )
        test_fail( __FILE__, __LINE__, "PAPI_library_init", retval );

    if ( ( retval = PAPI_create_eventset( &eventset ) ) )
        test_fail( __FILE__, __LINE__, "PAPI_create_eventset", retval );

#ifdef MPX
    if ( ( retval = PAPI_multiplex_init(  ) ) )
        test_fail( __FILE__, __LINE__, "PAPI_multiplex_init", retval );

    if ( ( retval = PAPI_set_multiplex( eventset ) ) )
        test_fail( __FILE__, __LINE__, "PAPI_set_multiplex", retval );
#endif

    nevents = 0;

    for ( i = 0; i < MAXEVENTS; i++ ) {
        if ( PAPI_query_event( events[i] ) != PAPI_OK )
            continue;
        if ( PAPI_add_event( eventset, events[i] ) == PAPI_OK ) {
            events[nevents] = events[i];
            nevents++;
        }
    }

    if ( nevents < 1 )
        test_skip( __FILE__, __LINE__, "Not enough events left...", 0 );

    /* Find a reasonable number of iterations (each 
     * event active 20 times) during the measurement
     */
    t2 = 10000 * 20 * nevents;  /* Target: 10000 usec/multiplex, 20 repeats */
    if ( t2 > 30e6 )
        test_skip( __FILE__, __LINE__, "This test takes too much time",
                   retval );

    /* Measure one run */
    t1 = PAPI_get_real_usec(  );
    y = dummy3( x, iters );
    t1 = PAPI_get_real_usec(  ) - t1;

    if ( t2 > t1 )           /* Scale up execution time to match t2 */
        iters = iters * ( int ) ( t2 / t1 );
    else if ( t1 > 30e6 )    /* Make sure execution time is < 30s per repeated test */
        test_skip( __FILE__, __LINE__, "This test takes too much time",
                   retval );

    x = 1.0;

    if ( !TESTS_QUIET )
        printf( "\nFirst run: Together.\n" );

    t1 = PAPI_get_real_usec(  );
    if ( ( retval = PAPI_start( eventset ) ) )
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );
    y = dummy3( x, iters );
    if ( ( retval = PAPI_stop( eventset, values ) ) )
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );
    t2 = PAPI_get_real_usec(  );

    if ( !TESTS_QUIET ) {
        printf( "\tOperations= %.1f Mflop", y * 1e-6 );
        printf( "\t(%g Mflop/s)\n\n", ( y / ( double ) ( t2 - t1 ) ) );
        printf( "PAPI grouped measurement:\n" );
    }
    for ( j = 0; j < nevents; j++ ) {
        PAPI_get_event_info( events[j], &info );
        if ( !TESTS_QUIET ) {
            printf( "%20s = ", info.short_descr );
            printf( LLDFMT, values[j] );
            printf( "\n" );
        }
    }
    if ( !TESTS_QUIET )
        printf( "\n" );


    if ( ( retval = PAPI_remove_events( eventset, events, nevents ) ) )
        test_fail( __FILE__, __LINE__, "PAPI_remove_events", retval );
    if ( ( retval = PAPI_destroy_eventset( &eventset ) ) )
        test_fail( __FILE__, __LINE__, "PAPI_destroy_eventset", retval );
    eventset = PAPI_NULL;
    if ( ( retval = PAPI_create_eventset( &eventset ) ) )
        test_fail( __FILE__, __LINE__, "PAPI_create_eventset", retval );

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

        if ( ( retval = PAPI_cleanup_eventset( eventset ) ) )
            test_fail( __FILE__, __LINE__, "PAPI_cleanup_eventset", retval );
        if ( ( retval = PAPI_add_event( eventset, events[i] ) ) )
            test_fail( __FILE__, __LINE__, "PAPI_add_event", retval );

        x = 1.0;

        if ( !TESTS_QUIET )
            printf( "\nReference measurement %d (of %d):\n", i + 1, nevents );

        t1 = PAPI_get_real_usec(  );
        if ( ( retval = PAPI_start( eventset ) ) )
            test_fail( __FILE__, __LINE__, "PAPI_start", retval );
        y = dummy3( x, iters );
        if ( ( retval = PAPI_stop( eventset, &refvalues[i] ) ) )
            test_fail( __FILE__, __LINE__, "PAPI_stop", retval );
        t2 = PAPI_get_real_usec(  );

        if ( !TESTS_QUIET ) {
            printf( "\tOperations= %.1f Mflop", y * 1e-6 );
            printf( "\t(%g Mflop/s)\n\n", ( y / ( double ) ( t2 - t1 ) ) );
        }
        PAPI_get_event_info( events[i], &info );
        if ( !TESTS_QUIET ) {
            printf( "PAPI results:\n%20s = ", info.short_descr );
            printf( LLDFMT, refvalues[i] );
            printf( "\n" );
        }
    }
    if ( !TESTS_QUIET )
        printf( "\n" );


    if ( !TESTS_QUIET ) {
        printf( "\n\nRelative accuracy:\n" );
        for ( j = 0; j < nevents; j++ )
            printf( "   Event %.2d", j );
        printf( "\n" );
    }

    for ( j = 0; j < nevents; j++ ) {
        spread[j] = abs( ( int ) ( refvalues[j] - values[j] ) );
        if ( values[j] )
            spread[j] /= ( double ) values[j];
        if ( !TESTS_QUIET )
            printf( "%10.3g ", spread[j] );
        /* Make sure that NaN get counted as errors */
        if ( spread[j] < MPX_TOLERANCE )
            i--;
        else if ( refvalues[j] < MINCOUNTS )    /* Neglect inprecise results with low counts */
            i--;
    }
    if ( !TESTS_QUIET )
        printf( "\n\n" );

    if ( i )
        test_fail( __FILE__, __LINE__, "Values outside threshold", i );
    else
        test_pass( __FILE__, NULL, 0 );

    return 0;
}

static double
dummy3( double x, int iters )
{
    int i;
    double w, y, z, a, b, c, d, e, f, g, h;
    double one;
    one = 1.0;
    w = x;
    y = x;
    z = x;
    a = x;
    b = x;
    c = x;
    d = x;
    e = x;
    f = x;
    g = x;
    h = x;
    for ( i = 1; i <= iters; i++ ) {
        w = w * 1.000000000001 + one;
        y = y * 1.000000000002 + one;
        z = z * 1.000000000003 + one;
        a = a * 1.000000000004 + one;
        b = b * 1.000000000005 + one;
        c = c * 0.999999999999 + one;
        d = d * 0.999999999998 + one;
        e = e * 0.999999999997 + one;
        f = f * 0.999999999996 + one;
        g = h * 0.999999999995 + one;
        h = h * 1.000000000006 + one;
    }
    return 2.0 * ( a + b + c + d + e + f + w + x + y + z + g + h );
}