high-level.c

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/*  This examples show the essentials in using the PAPI high-level
    interface. The program consists of 4 work-loops. The programer
    intends to count the total events for loop 1, 2 and 4, but not 
    include the number of events in loop 3.

    To accomplish this PAPI_read_counters is used as a counter
    reset function, while PAPI_accum_counters is used to sum

    the contributions of loops 2 and 4 into the total count.
*/

#include "papi_test.h"
extern int TESTS_QUIET;                /* Declared in test_utils.c */

int
main( int argc, char **argv )
{
#define NUM_EVENTS 2
    int retval;
    long long values[NUM_EVENTS], dummyvalues[NUM_EVENTS];
    long long myvalues[NUM_EVENTS];
    int Events[NUM_EVENTS];

    tests_quiet( argc, argv );  /* Set TESTS_QUIET variable */

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

    /* query and set up the right events to monitor */
    if ( PAPI_query_event( PAPI_FP_INS ) == PAPI_OK ) {
        Events[0] = PAPI_FP_INS;
    } else {
        Events[0] = PAPI_TOT_INS;
    }
    Events[1] = PAPI_TOT_CYC;

    retval = PAPI_start_counters( ( int * ) Events, NUM_EVENTS );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_start_counters", retval );

    /* Loop 1 */
    do_flops( NUM_FLOPS );

    retval = PAPI_read_counters( values, NUM_EVENTS );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_read_counters", retval );

    if ( !TESTS_QUIET )
        printf( TWO12, values[0], values[1], "(Counters continuing...)\n" );

    myvalues[0] = values[0];
    myvalues[1] = values[1];
    /* Loop 2 */
    do_flops( NUM_FLOPS );

    retval = PAPI_accum_counters( values, NUM_EVENTS );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_accum_counters", retval );

    if ( !TESTS_QUIET )
        printf( TWO12, values[0], values[1], "(Counters being ''held'')\n" );

    /* Loop 3 */
    /* Simulated code that should not be counted */
    do_flops( NUM_FLOPS );

    retval = PAPI_read_counters( dummyvalues, NUM_EVENTS );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_read_counters", retval );
    if ( !TESTS_QUIET )
        printf( TWO12, dummyvalues[0], dummyvalues[1], "(Skipped counts)\n" );

    if ( !TESTS_QUIET )
        printf( "%12s %12s  (''Continuing'' counting)\n", "xxx", "xxx" );
    /* Loop 4 */
    do_flops( NUM_FLOPS );

    retval = PAPI_accum_counters( values, NUM_EVENTS );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_accum_counters", retval );

    if ( !TESTS_QUIET )
        printf( TWO12, values[0], values[1], "" );

    if ( !TESTS_QUIET ) {
        printf( "----------------------------------\n" );
        printf( "Verification: The last line in each experiment should be\n" );
        printf( "approximately three times the value of the first line.\n" );
    }

    {
        long long min, max;
        min = ( long long ) ( ( double ) myvalues[0] * .9 );
        max = ( long long ) ( ( double ) myvalues[0] * 1.1 );
        if ( values[0] < ( 3 * min ) || values[0] > ( 3 * max ) ) {
            retval = 1;
            if ( PAPI_query_event( PAPI_FP_INS ) == PAPI_OK ) {
                test_fail( __FILE__, __LINE__, "PAPI_FP_INS", 1 );
            } else {
                test_fail( __FILE__, __LINE__, "PAPI_TOT_INS", 1 );
            }
        }
        min = ( long long ) ( ( double ) myvalues[1] * .9 );
        max = ( long long ) ( ( double ) myvalues[1] * 1.1 );
        if ( values[1] < ( 3 * min ) || values[1] > ( 3 * max ) ) {
            retval = 1;
            test_fail( __FILE__, __LINE__, "PAPI_TOT_CYC", 1 );
        }
    }
    /* The values array is not allocated through allocate_test_space 
     * so we need to pass NULL here */
    test_pass( __FILE__, NULL, NUM_EVENTS );
    exit( 1 );
}