exec_overflow.c File Reference

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Macros
#define	MAX_EVENTS   3

Functions
static void	my_handler (int EventSet, void *pc, long long ovec, void *context)
static void	print_rate (const char *str)
static void	run (const char *str, int len)
int	main (int argc, char **argv)

Variables
static int	Event [MAX_EVENTS]
static int	Threshold [MAX_EVENTS]
static struct timeval start	last
static long	count
static long	total

Macro Definition Documentation

MAX_EVENTS

#define MAX_EVENTS   3

Definition at line 17 of file exec_overflow.c.

Function Documentation

main()

int main	(	int	argc,
		char **	argv
	)

Definition at line 94 of file exec_overflow.c.

{
    int num_events = 1;
    const char *name = "unknown";
    int ev,EventSet = PAPI_NULL;
    int quiet,retval;

    /* Used to be able to set this via command line */
    num_events=1;

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

    do_cycles( 1 );

    /* Zero out the Counters */
    gettimeofday( &start, NULL );
    last = start;
    count = 0;
    total = 0;

    /* Initialize PAPI */
    retval=PAPI_library_init( PAPI_VER_CURRENT );
    if (retval!=PAPI_VER_CURRENT) {
        test_fail( __FILE__, __LINE__, "PAPI_library_init failed", 1 );
    }

    name = argv[0];
    if (!quiet) {
        printf( "[%d] %s, num_events = %d\n", getpid(),
            name, num_events );
    }

    /* Create eventset */
    if ( PAPI_create_eventset( &EventSet ) != PAPI_OK ) {
        test_fail( __FILE__, __LINE__, "PAPI_create_eventset failed", 1 );
    }

    /* Add events */
    for ( ev = 0; ev < num_events; ev++ ) {
        if ( PAPI_add_event( EventSet, Event[ev] ) != PAPI_OK ) {
            if (!quiet) printf("Trouble adding event\n");
            test_skip( __FILE__, __LINE__, "PAPI_add_event failed", 1 );
        }
    }

    /* Set overflow */
    for ( ev = 0; ev < num_events; ev++ ) {
        if ( PAPI_overflow( EventSet, Event[ev],
                    Threshold[ev], 0, my_handler )
             != PAPI_OK ) {
            test_fail( __FILE__, __LINE__, "PAPI_overflow failed", 1 );
        }
    }

    /* Start measuring */
    if ( PAPI_start( EventSet ) != PAPI_OK ) {
        test_fail( __FILE__, __LINE__, "PAPI_start failed", 1 );
    }



    /* Tun a bit */
    run( name, 3 );

    /* Stop measuring */
    if (!quiet) {
        printf("[%d] %s, %s\n", getpid(), name, "stop");
    }

    if ( PAPI_stop( EventSet, NULL ) != PAPI_OK ) {
        test_fail( name, __LINE__, "PAPI_stop failed", 1 );
    }

    if (!quiet) {
        printf("[%d] %s, %s\n", getpid(),
            name, "exec(./child_overflow)");
    }

    /* exec the child_overflow helper program */
    /* we should never return from this */
    if ( access( "./child_overflow", X_OK ) == 0 )
        execl( "./child_overflow", "./child_overflow",
               ( quiet ? "TESTS_QUIET" : NULL ), NULL );
    else if ( access( "./ctests/child_overflow", X_OK ) == 0 )
        execl( "./ctests/child_overflow", "./ctests/child_overflow",
               ( quiet ? "TESTS_QUIET" : NULL ), NULL );

    test_fail( name, __LINE__, "exec failed", 1 );

    return 0;
}

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my_handler()

static void my_handler ( int  EventSet, void *  pc, long long  ovec, void *  context  )

static

Definition at line 35 of file exec_overflow.c.

{
    ( void ) EventSet;
    ( void ) pc;
    ( void ) ovec;
    ( void ) context;

    count++;
    total++;
}

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print_rate()

static void print_rate ( const char *  str )

static

Definition at line 51 of file exec_overflow.c.

{
    static int last_count = -1;
    struct timeval now;
    double st_secs, last_secs;

    gettimeofday( &now, NULL );
    st_secs = ( double ) ( now.tv_sec - start.tv_sec )
        + ( ( double ) ( now.tv_usec - start.tv_usec ) ) / 1000000.0;
    last_secs = ( double ) ( now.tv_sec - last.tv_sec )
        + ( ( double ) ( now.tv_usec - last.tv_usec ) ) / 1000000.0;
    if ( last_secs <= 0.001 )
        last_secs = 0.001;

    if (!TESTS_QUIET) {
        printf( "[%d] %s, time = %.3f, total = %ld, last = %ld, rate = %.1f/sec\n",
            getpid(  ), str, st_secs, total, count,
            ( ( double ) count ) / last_secs );
    }

    if ( last_count != -1 ) {
        if ( count < .1 * last_count ) {
            test_fail( __FILE__, __LINE__, "Interrupt rate changed!", 1 );
            exit( 1 );
        }
    }
    last_count = ( int ) count;
    count = 0;
    last = now;
}

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run()

static void run ( const char *  str, int  len  )

static

Definition at line 83 of file exec_overflow.c.

{
    int n;

    for ( n = 1; n <= len; n++ ) {
        do_cycles( 1 );
        print_rate( str );
    }
}

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Variable Documentation

count

long count

static

Definition at line 32 of file exec_overflow.c.

Event

int Event[MAX_EVENTS]

static

Initial value:

= {
    PAPI_TOT_CYC,
    PAPI_FP_INS,
    PAPI_FAD_INS,
}

Definition at line 19 of file exec_overflow.c.

last

struct timeval start last

static

Definition at line 31 of file exec_overflow.c.

Threshold

int Threshold[MAX_EVENTS]

static

Initial value:

= {
    8000000,
    4000000,
    4000000,
}

Definition at line 25 of file exec_overflow.c.

total

long total

static

Definition at line 32 of file exec_overflow.c.