cost.c

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#include "papi_test.h"
#include "cost_utils.h"

int 
find_derived( int i , char *type)
{
  PAPI_event_info_t info;

  PAPI_enum_event( &i, PAPI_ENUM_FIRST );

  do {
    if ( PAPI_get_event_info( i, &info ) == PAPI_OK ) {
      if ( strcmp( info.derived, type) == 0 )
        return i;
    }
  } while ( PAPI_enum_event( &i, PAPI_PRESET_ENUM_AVAIL ) == PAPI_OK );

  return PAPI_NULL;
}

/* Slight misnomer, find derived event != DERIVED_POSTFIX */
int
find_derived_add( int i ) 
{
  int ret;

  if ( (ret = find_derived( i, "DERIVED_ADD")) != PAPI_NULL)
    return ret;


  return find_derived( i, "DERIVED_SUB"); 
}

int 
find_derived_postfix( int i ) 
{
  return ( find_derived ( i, "DERIVED_POSTFIX" ) );
}

static void
print_help( void )
{
    printf( "This is the PAPI cost program.\n" );
    printf
        ( "It computes min / max / mean / std. deviation for PAPI start/stop pairs; for PAPI reads, and for PAPI_accums.  Usage:\n\n" );
    printf( "    cost [options] [parameters]\n" );
    printf( "    cost TESTS_QUIET\n\n" );
    printf( "Options:\n\n" );
    printf
        ( "  -b BINS       set the number of bins for the graphical distribution of costs. Default: 100\n" );
    printf( "  -d            show a graphical distribution of costs\n" );
    printf( "  -h            print this help message\n" );
    printf
        ( "  -s            show number of iterations above the first 10 std deviations\n" );
    printf
        ( "  -t THRESHOLD  set the threshold for the number of iterations. Default: 100,000\n" );
    printf( "\n" );
}


static void
print_stats( int i, long long min, long long max, double average, double std )
{
    char *test[] = { "loop latency", "PAPI_start/stop (2 counters)",
        "PAPI_read (2 counters)", "PAPI_read_ts (2 counters)",
            "PAPI_accum (2 counters)", "PAPI_reset (2 counters)", 
            "PAPI_read (1 derived_postfix counter)"," PAPI_read (1 derived_[add|sub] counter)"
    };
    printf( "\nTotal cost for %s over %d iterations\n", test[i], num_iters );
    printf
        ( "min cycles   : %lld\nmax cycles   : %lld\nmean cycles  : %lf\nstd deviation: %lf\n ",
          min, max, average, std );
}

static void
print_std_dev( int *s )
{
    int i;

    printf( "\n" );
    printf
        ( "              --------# Standard Deviations Above the Mean--------\n" );
    printf
        ( "0-------1-------2-------3-------4-------5-------6-------7-------8-------9-----10\n" );
    for ( i = 0; i < 10; i++ )
        printf( "  %d\t", s[i] );
    printf( "\n\n" );
}

static void
print_dist( long long min, long long max, int bins, int *d )
{
    int i, j;
    int step = ( int ) ( max - min ) / bins;

    printf( "\nCost distribution profile\n\n" );
    for ( i = 0; i < bins; i++ ) {
        printf( "%8d:", ( int ) min + ( step * i ) );
        if ( d[i] > 100 ) {
            printf
                ( "**************************** %d counts ****************************",
                  d[i] );
        } else {
            for ( j = 0; j < d[i]; j++ )
                printf( "*" );
        }
        printf( "\n" );
    }
}

static void
do_output( int test_type, long long *array, int bins, int show_std_dev,
           int show_dist )
{
    int s[10];
    long long min, max;
    double average, std;

    std = do_stats( array, &min, &max, &average );

    print_stats( test_type, min, max, average, std );

    if ( show_std_dev ) {
        do_std_dev( array, s, std, average );
        print_std_dev( s );
    }

    if ( show_dist ) {
        int *d;
        d = calloc( bins , sizeof ( int ) );
        do_dist( array, min, max, bins, d );
        print_dist( min, max, bins, d );
        free( d );
    }
}


int
main( int argc, char **argv )
{
    int i, retval, EventSet = PAPI_NULL;
    int retval_start,retval_stop;
    int bins = 100;
    int show_dist = 0, show_std_dev = 0;
    long long totcyc, values[2];
    long long *array;
    int event;
    PAPI_event_info_t info;


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

    for ( i = 0; i < argc; i++ ) {
        if ( argv[i] ) {
            if ( strstr( argv[i], "-b" ) ) {
                bins = atoi( argv[i + 1] );
                if ( bins )
                    i++;
                else {
                    printf( "-b requires a bin count!\n" );
                    exit( 1 );
                }
            }
            if ( strstr( argv[i], "-d" ) )
                show_dist = 1;
            if ( strstr( argv[i], "-h" ) ) {
                print_help(  );
                exit( 1 );
            }
            if ( strstr( argv[i], "-s" ) )
                show_std_dev = 1;
            if ( strstr( argv[i], "-t" ) ) {
                num_iters = ( int ) atol( argv[i + 1] );
                if ( num_iters )
                    i++;
                else {
                    printf( "-t requires a threshold value!\n" );
                    exit( 1 );
                }
            }
        }
    }

    printf( "Cost of execution for PAPI start/stop, read and accum.\n" );
    printf( "This test takes a while. Please be patient...\n" );

    if ( ( retval =
           PAPI_library_init( PAPI_VER_CURRENT ) ) != PAPI_VER_CURRENT )
        test_fail( __FILE__, __LINE__, "PAPI_library_init", retval );
    if ( ( retval = PAPI_set_debug( PAPI_VERB_ECONT ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_set_debug", retval );
    if ( ( retval = PAPI_query_event( PAPI_TOT_CYC ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_query_event", retval );
    if ( ( retval = PAPI_query_event( PAPI_TOT_INS ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_query_event", retval );
    if ( ( retval = PAPI_create_eventset( &EventSet ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_create_eventset", retval );

    if ( ( retval = PAPI_add_event( EventSet, PAPI_TOT_CYC ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_add_event", retval );

    if ( ( retval = PAPI_add_event( EventSet, PAPI_TOT_INS ) ) != PAPI_OK )
        if ( ( retval = PAPI_add_event( EventSet, PAPI_TOT_IIS ) ) != PAPI_OK )
            test_fail( __FILE__, __LINE__, "PAPI_add_event", retval );

    /* Make sure no errors and warm up */

    totcyc = PAPI_get_real_cyc(  );
    if ( ( retval = PAPI_start( EventSet ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );
    if ( ( retval = PAPI_stop( EventSet, NULL ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );

    array =
        ( long long * ) malloc( ( size_t ) num_iters * sizeof ( long long ) );
    if ( array == NULL )
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );

    /* Determine clock latency */

    printf( "\nPerforming loop latency test...\n" );

    for ( i = 0; i < num_iters; i++ ) {
        totcyc = PAPI_get_real_cyc(  );
        totcyc = PAPI_get_real_cyc(  ) - totcyc;
        array[i] = totcyc;
    }

    do_output( 0, array, bins, show_std_dev, show_dist );

    /* Start the start/stop eval */

    printf( "\nPerforming start/stop test...\n" );

    for ( i = 0; i < num_iters; i++ ) {
        totcyc = PAPI_get_real_cyc(  );
        retval_start=PAPI_start( EventSet );
        retval_stop=PAPI_stop( EventSet, values );
        totcyc = PAPI_get_real_cyc(  ) - totcyc;        
        array[i] = totcyc;
        if (retval_start || retval_stop) {
           test_fail( __FILE__, __LINE__, "PAPI start/stop", retval_start );
        }
    }

    do_output( 1, array, bins, show_std_dev, show_dist );

    /* Start the read eval */
    printf( "\nPerforming read test...\n" );

    if ( ( retval = PAPI_start( EventSet ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );
    PAPI_read( EventSet, values );

    for ( i = 0; i < num_iters; i++ ) {
        totcyc = PAPI_get_real_cyc(  );
        PAPI_read( EventSet, values );
        totcyc = PAPI_get_real_cyc(  ) - totcyc;
        array[i] = totcyc;
    }
    if ( ( retval = PAPI_stop( EventSet, values ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );

    do_output( 2, array, bins, show_std_dev, show_dist );

    /* Start the read with timestamp eval */
    printf( "\nPerforming read with timestamp test...\n" );

    if ( ( retval = PAPI_start( EventSet ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );
    PAPI_read_ts( EventSet, values, &totcyc );

    for ( i = 0; i < num_iters; i++ ) {
        PAPI_read_ts( EventSet, values, &array[i] );
    }
    if ( ( retval = PAPI_stop( EventSet, values ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );

    /* post-process the timing array */
    for ( i = num_iters - 1; i > 0; i-- ) {
        array[i] -= array[i - 1];
    }
    array[0] -= totcyc;

    do_output( 3, array, bins, show_std_dev, show_dist );

    /* Start the accum eval */
    printf( "\nPerforming accum test...\n" );

    if ( ( retval = PAPI_start( EventSet ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );
    PAPI_accum( EventSet, values );

    for ( i = 0; i < num_iters; i++ ) {
        totcyc = PAPI_get_real_cyc(  );
        PAPI_accum( EventSet, values );
        totcyc = PAPI_get_real_cyc(  ) - totcyc;
        array[i] = totcyc;
    }
    if ( ( retval = PAPI_stop( EventSet, values ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );

    do_output( 4, array, bins, show_std_dev, show_dist );

    /* Start the reset eval */
    printf( "\nPerforming reset test...\n" );

    if ( ( retval = PAPI_start( EventSet ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );

    for ( i = 0; i < num_iters; i++ ) {
        totcyc = PAPI_get_real_cyc(  );
        PAPI_reset( EventSet );
        totcyc = PAPI_get_real_cyc(  ) - totcyc;
        array[i] = totcyc;
    }
    if ( ( retval = PAPI_stop( EventSet, values ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );

    do_output( 5, array, bins, show_std_dev, show_dist );

    /* Derived event test */
    PAPI_cleanup_eventset( EventSet );

    event = 0 | PAPI_PRESET_MASK;

    if ( ( event = find_derived_postfix( event ) ) != PAPI_NULL ) {
      if ( (retval = PAPI_add_event( EventSet, event) ) != PAPI_OK )
        test_fail(__FILE__, __LINE__, "PAPI_add_event", retval);

      PAPI_get_event_info(event, &info);
      printf( "\nPerforming DERIVED_POSTFIX PAPI_read(%d counters)  test...", info.count );

      if ( ( retval = PAPI_start( EventSet ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );
      PAPI_read( EventSet, values );

      for ( i = 0; i < num_iters; i++ ) {
        totcyc = PAPI_get_real_cyc(  );
        PAPI_read( EventSet, values );
        totcyc = PAPI_get_real_cyc(  ) - totcyc;
        array[i] = totcyc;
      }
      if ( ( retval = PAPI_stop( EventSet, values ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );

      do_output( 6, array, bins, show_std_dev, show_dist );

    } else {
      printf("\tI was unable to find a DERIVED_POSTFIX preset event to "
          "test on this architecture, skipping.\n");
    }

    if ( ( event = find_derived_add( event ) ) != PAPI_NULL ) {
      if ( (retval = PAPI_add_event( EventSet, event) ) != PAPI_OK )
        test_fail(__FILE__, __LINE__, "PAPI_add_event", retval);

      PAPI_get_event_info(event, &info);
      printf( "\nPerforming DERIVED_[ADD|SUB] PAPI_read(%d counters)  test...", info.count );

      if ( ( retval = PAPI_start( EventSet ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );
      PAPI_read( EventSet, values );

      for ( i = 0; i < num_iters; i++ ) {
        totcyc = PAPI_get_real_cyc(  );
        PAPI_read( EventSet, values );
        totcyc = PAPI_get_real_cyc(  ) - totcyc;
        array[i] = totcyc;
      }
      if ( ( retval = PAPI_stop( EventSet, values ) ) != PAPI_OK )
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );

      do_output( 7, array, bins, show_std_dev, show_dist );
    } else {
      printf("\tI was unable to find a suitable DERIVED_[ADD|SUB] event to test, skipping.\n");
    }

    free( array );
    test_pass( __FILE__, NULL, 0 );
    exit( 1 );
}