overflow_index.c

Go to the documentation of this file.

/*
* File:    overflow_index.c
* Author:  min@cs.utk.edu
*          Min Zhou
*/
 
/* This file performs the following test: overflow dispatch on 2 counters. */
 
#include <stdio.h>
#include <stdlib.h>
 
#include "papi.h"
#include "papi_test.h"
 
#include "do_loops.h"
 
#define OVER_FMT    "handler(%d) Overflow at %p! vector=%#llx\n"
#define OUT_FMT     "%-12s : %16lld%16lld\n"
#define INDEX_FMT   "Overflows vector %#llx: \n"
 
typedef struct
{
    long long mask;
    int count;
} ocount_t;
 
/* there are three possible vectors, one counter overflows, the other
   counter overflows, both overflow */
static ocount_t overflow_counts[3] = { {0, 0}, {0, 0}, {0, 0} };
static int total_unknown = 0;
 
static void
handler( int EventSet, void *address, long long overflow_vector, void *context )
{
    int i;
 
    ( void ) context;
 
    if ( !TESTS_QUIET ) {
        fprintf( stderr, OVER_FMT, EventSet, address, overflow_vector );
    }
 
    /* Look for the overflow_vector entry */
 
    for ( i = 0; i < 3; i++ ) {
        if ( overflow_counts[i].mask == overflow_vector ) {
            overflow_counts[i].count++;
            return;
        }
    }
 
    /* Didn't find it so add it. */
 
    for ( i = 0; i < 3; i++ ) {
        if ( overflow_counts[i].mask == ( long long ) 0 ) {
            overflow_counts[i].mask = overflow_vector;
            overflow_counts[i].count = 1;
            return;
        }
    }
 
    /* Unknown entry!?! */
 
    total_unknown++;
}
 
int
main( int argc, char **argv )
{
    int EventSet = PAPI_NULL;
    long long ( values[3] )[2];
    int retval;
    int PAPI_event, k, i;
    char event_name[PAPI_MAX_STR_LEN];
    int index_array[2], number;
    int num_events1, mask1;
    int quiet;
 
    /* Set TESTS_QUIET variable */
    quiet = tests_quiet( argc, argv );
 
    retval = PAPI_library_init( PAPI_VER_CURRENT );
    if ( retval != PAPI_VER_CURRENT ) {
        test_fail( __FILE__, __LINE__, "PAPI_library_init", retval );
    }
 
    /* add PAPI_TOT_CYC and one of the events in PAPI_FP_INS, PAPI_FP_OPS or
       PAPI_TOT_INS, depends on the availability of the event on the
       platform */
    EventSet = add_two_nonderived_events( &num_events1, &PAPI_event, &mask1 );
 
    if (num_events1==0) {
        if (!quiet) printf("Trouble adding events\n");
        test_skip(__FILE__,__LINE__,"Adding events",0);
    }
 
    retval = PAPI_start( EventSet );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );
 
    do_flops( NUM_FLOPS );
 
    retval = PAPI_stop( EventSet, values[0] );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );
 
    retval = PAPI_overflow( EventSet, PAPI_event, THRESHOLD, 0, handler );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_overflow", retval );
    retval = PAPI_overflow( EventSet, PAPI_TOT_CYC, THRESHOLD, 0, handler );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_overflow", retval );
 
    retval = PAPI_start( EventSet );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );
 
    do_flops( NUM_FLOPS );
 
    retval = PAPI_stop( EventSet, values[1] );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );
 
     retval = PAPI_event_code_to_name( PAPI_event, event_name );
    if (retval != PAPI_OK ) {
        test_fail( __FILE__, __LINE__, "PAPI_event_code_to_name", retval );
    }
 
    if (!quiet) {
        printf( "Test case: Overflow dispatch of 2nd event in set with 2 events.\n" );
        printf( "---------------------------------------------------------------\n" );
        printf( "Threshold for overflow is: %d\n", THRESHOLD );
        printf( "Using %d iterations of c += a*b\n", NUM_FLOPS );
        printf( "-----------------------------------------------\n" );
 
        printf( "Test type    : %16d%16d\n", 1, 2 );
        printf( OUT_FMT, "PAPI_TOT_CYC", ( values[0] )[0], ( values[1] )[0] );
        printf( OUT_FMT, event_name, ( values[0] )[1], ( values[1] )[1] );
    }
 
    if ( overflow_counts[0].count == 0 && overflow_counts[1].count == 0 ) {
        test_fail( __FILE__, __LINE__,
                "one counter had no overflows", 1 );
    }
 
    for ( k = 0; k < 3; k++ ) {
        if ( overflow_counts[k].mask ) {
            number = 2;
            retval = PAPI_get_overflow_event_index( EventSet,
                        overflow_counts[k].mask,
                        index_array, &number );
            if ( retval != PAPI_OK ) {
                test_fail( __FILE__, __LINE__,
                           "PAPI_get_overflow_event_index", retval );
            }
            if (!quiet) {
                printf( INDEX_FMT, ( long long ) overflow_counts[k].mask );
                printf( " counts: %d ", overflow_counts[k].count );
                for ( i = 0; i < number; i++ )
                    printf( " Event Index %d ", index_array[i] );
                printf( "\n" );
            }
        }
    }
 
    if (!quiet) {
        printf( "Case 2 %s Overflows: %d\n", "Unknown", total_unknown );
        printf( "-----------------------------------------------\n" );
    }
 
    if ( total_unknown > 0 ) {
        test_fail( __FILE__, __LINE__, "Unknown counter had overflows", 1 );
    }
 
    retval = PAPI_cleanup_eventset( EventSet );
    if ( retval != PAPI_OK ) {
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );
    }
 
    test_pass( __FILE__ );
 
    return 0;
}