ctests/overflow_pthreads.c File Reference

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Functions
static void	handler (int EventSet, void *address, long long overflow_vector, void *context)
static void *	Thread (void *arg)
int	main (int argc, char **argv)

Variables
static const PAPI_hw_info_t *	hw_info = NULL
static int	total [NUM_THREADS]
static int	expected [NUM_THREADS]
static pthread_t	myid [NUM_THREADS]
static long long	mythreshold =0

Function Documentation

handler()

static void handler ( int  EventSet, void *  address, long long  overflow_vector, void *  context  )

static

Definition at line 33 of file ctests/overflow_pthreads.c.

{
#if 0
    printf( "handler(%d,%#lx,%llx) Overflow %d in thread %lx\n",
            EventSet, ( unsigned long ) address, overflow_vector,
            total[EventSet], PAPI_thread_id(  ) );
    printf( "%lx vs %lx\n", myid[EventSet], PAPI_thread_id(  ) );
#else  /* eliminate unused parameter warning message */
    ( void ) address;
    ( void ) overflow_vector;
    ( void ) context;
#endif
    total[EventSet]++;
}

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main()

int main	(	int	argc,
		char **	argv
	)

Definition at line 132 of file ctests/overflow_pthreads.c.

{
    pthread_t id[NUM_THREADS];
    int flops[NUM_THREADS];
    int i, rc, retval;
    pthread_attr_t attr;
    float ratio;
    int quiet;
 
    /* Set TESTS_QUIET variable */
    quiet = tests_quiet( argc, argv );
 
    memset( total, 0x0, NUM_THREADS * sizeof ( *total ) );
    memset( expected, 0x0, NUM_THREADS * sizeof ( *expected ) );
    memset( myid, 0x0, NUM_THREADS * sizeof ( *myid ) );
 
    retval = PAPI_library_init( PAPI_VER_CURRENT );
    if (retval != PAPI_VER_CURRENT ) {
        test_fail( __FILE__, __LINE__, "PAPI_library_init", retval );
    }
 
    hw_info = PAPI_get_hardware_info(  );
    if ( hw_info == NULL ) {
        test_fail( __FILE__, __LINE__, "PAPI_get_hardware_info", 2 );
    }
 
    retval = PAPI_thread_init( ( unsigned long ( * )( void ) )
                    ( pthread_self ) );
    if (retval != PAPI_OK ) {
        if ( retval == PAPI_ECMP )
            test_skip( __FILE__, __LINE__, "PAPI_thread_init", retval );
        else
            test_fail( __FILE__, __LINE__, "PAPI_thread_init", retval );
    }
#if defined(linux)
    mythreshold = ((long long)hw_info->cpu_max_mhz) * 10000 * 2;
#else
    mythreshold = THRESHOLD * 2;
#endif
 
    pthread_attr_init( &attr );
#ifdef PTHREAD_CREATE_UNDETACHED
    pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_UNDETACHED );
#endif
#ifdef PTHREAD_SCOPE_SYSTEM
    retval = pthread_attr_setscope( &attr, PTHREAD_SCOPE_SYSTEM );
    if ( retval != 0 )
        test_skip( __FILE__, __LINE__, "pthread_attr_setscope", retval );
#endif
 
    for ( i = 0; i < NUM_THREADS; i++ ) {
        flops[i] = NUM_FLOPS * ( i + 1 );
        rc = pthread_create( &id[i], &attr, Thread, ( void * ) &flops[i] );
        if ( rc )
            test_fail( __FILE__, __LINE__, "pthread_create", PAPI_ESYS );
    }
    for ( i = 0; i < NUM_THREADS; i++ )
        pthread_join( id[i], NULL );
 
    pthread_attr_destroy( &attr );
 
    {
        long long t = 0, r = 0;
        for ( i = 0; i < NUM_THREADS; i++ ) {
            t += ( NUM_FLOPS * ( i + 1 ) ) / mythreshold;
            r += total[i];
        }
        if (!quiet) {
            printf( "Expected total overflows: %lld\n", t );
            printf( "Received total overflows: %lld\n", r );
        }
    }
// FIXME: are we actually testing this properly?
 
/*   ratio = (float)total[0] / (float)expected[0]; */
/*   printf("Ratio of total to expected: %f\n",ratio); */
    ratio = 1.0;
    for ( i = 0; i < NUM_THREADS; i++ ) {
        if (!quiet) printf( "Overflows thread %d: %d, expected %d\n",
                i, total[i], ( int ) ( ratio * ( float ) expected[i] ) );
    }
 
    for ( i = 0; i < NUM_THREADS; i++ ) {
        if ( total[i] < ( int ) ( ( ratio * ( float ) expected[i] ) / 2.0 ) )
            test_fail( __FILE__, __LINE__, "not enough overflows", PAPI_EMISC );
    }
 
    test_pass( __FILE__ );
 
    pthread_exit( NULL );
 
    return 0;
 
}

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Thread()

static void * Thread ( void *  arg )

static

Definition at line 51 of file ctests/overflow_pthreads.c.

{
    int retval, num_tests = 1;
    int EventSet1 = PAPI_NULL;
    int mask1, papi_event;
    int num_events1;
    long long **values;
    long long elapsed_us, elapsed_cyc;
    char event_name[PAPI_MAX_STR_LEN];
 
    retval = PAPI_register_thread(  );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_register_thread", 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 */
    EventSet1 =
        add_two_nonderived_events( &num_events1, &papi_event, &mask1 );
 
    if (EventSet1 < 0) return NULL;
 
    /* Wait, we're indexing a per-thread array with the EventSet number? */
    /* does that make any sense at all???? -- vmw                        */
    expected[EventSet1] = *( int * ) arg / mythreshold;
    myid[EventSet1] = PAPI_thread_id(  );
 
    values = allocate_test_space( num_tests, num_events1 );
 
    elapsed_us = PAPI_get_real_usec(  );
 
    elapsed_cyc = PAPI_get_real_cyc(  );
 
    if ((retval = PAPI_overflow( EventSet1, papi_event, 
                     mythreshold, 0, handler ) ) != PAPI_OK ) {
       test_fail( __FILE__, __LINE__, "PAPI_overflow", retval );
    }
 
    /* start_timer(1); */
    if ( ( retval = PAPI_start( EventSet1 ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );
 
    do_stuff(  );
 
    if ( ( retval = PAPI_stop( EventSet1, values[0] ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );
 
    elapsed_us = PAPI_get_real_usec(  ) - elapsed_us;
 
    elapsed_cyc = PAPI_get_real_cyc(  ) - elapsed_cyc;
 
    retval = PAPI_overflow( EventSet1, papi_event, 0, 0, NULL );
    if (retval != PAPI_OK ) {
        test_fail( __FILE__, __LINE__, "PAPI_overflow", retval );
    }
 
    remove_test_events( &EventSet1, mask1 );
 
    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 ( !TESTS_QUIET ) {
        printf( "Thread %#x %s : \t%lld\n", ( int ) pthread_self(  ),
                event_name, ( values[0] )[0] );
        printf( "Thread %#x PAPI_TOT_CYC: \t%lld\n", ( int ) pthread_self(  ),
                ( values[0] )[1] );
        printf( "Thread %#x Real usec   : \t%lld\n", ( int ) pthread_self(  ),
                elapsed_us );
        printf( "Thread %#x Real cycles : \t%lld\n", ( int ) pthread_self(  ),
                elapsed_cyc );
    }
    free_test_space( values, num_tests );
    retval = PAPI_unregister_thread(  );
    if ( retval != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_unregister_thread", retval );
    return ( NULL );
}

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Variable Documentation

expected

int expected[NUM_THREADS]

static

Definition at line 29 of file ctests/overflow_pthreads.c.

hw_info

const PAPI_hw_info_t* hw_info = NULL

static

Definition at line 27 of file ctests/overflow_pthreads.c.

myid

pthread_t myid[NUM_THREADS]

static

Definition at line 30 of file ctests/overflow_pthreads.c.

mythreshold

long long mythreshold =0

static

Definition at line 48 of file ctests/overflow_pthreads.c.

total

int total[NUM_THREADS]

static

Definition at line 28 of file ctests/overflow_pthreads.c.