Include dependency graph for do_loops.c:

Functions
void	do_reads (int n)
void	fdo_reads (int *n)
void	fdo_reads_ (int *n)
void	fdo_reads__ (int *n)
void	FDO_READS (int *n)
void	_FDO_READS (int *n)
void	do_flops (int n)
void	fdo_flops (int *n)
void	fdo_flops_ (int *n)
void	fdo_flops__ (int *n)
void	FDO_FLOPS (int *n)
void	_FDO_FLOPS (int *n)
void	do_misses (int n, int bytes)
void	fdo_misses (int n, int size)
void	fdo_misses_ (int n, int size)
void	fdo_misses__ (int n, int size)
void	FDO_MISSES (int n, int size)
void	_FDO_MISSES (int n, int size)
void	do_flush (void)
void	fdo_flush (void)
void	fdo_flush_ (void)
void	fdo_flush__ (void)
void	FDO_FLUSH (void)
void	_FDO_FLUSH (void)
void	do_l1misses (int n)
void	fdo_l1misses (int *n)
void	fdo_l1misses_ (int *n)
void	fdo_l1misses__ (int *n)
void	FDO_L1MISSES (int *n)
void	_FDO_L1MISSES (int *n)
void	do_stuff (void)
void	do_stuff_ (void)
void	do_stuff__ (void)
void	DO_STUFF (void)
void	_DO_STUFF (void)
Variables
volatile int	buf [16 1024 1024]
volatile int	buf_dummy = 0
volatile int *	flush = NULL
volatile int	flush_dummy = 0
volatile double	a = 0.5
volatile double	b = 2.2

Function Documentation

void _DO_STUFF ( void )

Definition at line 294 of file do_loops.c.

{
    do_stuff(  );
}

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void _FDO_FLOPS ( int * n )

Definition at line 107 of file do_loops.c.

{
    do_flops( *n );
}

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void _FDO_FLUSH ( void )

Definition at line 208 of file do_loops.c.

{
    do_flush(  );
}

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void _FDO_L1MISSES ( int * n )

Definition at line 244 of file do_loops.c.

{
    do_l1misses( *n );
}

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void _FDO_MISSES	(	int *	n,
		int *	size
	)

Definition at line 160 of file do_loops.c.

{
    do_misses( *n, *size );
}

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void _FDO_READS ( int * n )

Definition at line 65 of file do_loops.c.

{
    do_reads( *n );
}

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void do_flops ( int n )

Definition at line 71 of file do_loops.c.

{
    int i;
    double c = 0.11;

    for ( i = 0; i < n; i++ ) {
        c += a * b;
    }
    dummy( ( void * ) &c );
}

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void do_flush ( void )

Definition at line 166 of file do_loops.c.

{
    register int i;
    if ( flush == NULL )
        flush = ( int * ) malloc( ( 1024 * 1024 * 16 ) * sizeof ( int ) );
    if ( !flush )
        return;

    dummy( ( void * ) flush );
    for ( i = 0; i < ( 1024 * 1024 * 16 ); i++ ) {
        flush[i] += flush_dummy;
    }
    flush_dummy++;
    dummy( ( void * ) flush );
    dummy( ( void * ) &flush_dummy );
}

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void do_l1misses ( int n )

Definition at line 214 of file do_loops.c.

{
    do_misses( n, L1_MISS_BUFFER_SIZE_INTS );
}

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void do_misses	(	int	n,
		int	bytes
	)

Definition at line 113 of file do_loops.c.

{
    register int i, j, tmp = buf_dummy, len = bytes / ( int ) sizeof ( int );
    dummy( ( void * ) buf );
    dummy( ( void * ) &buf_dummy );
    assert( len <= CACHE_FLUSH_BUFFER_SIZE_INTS );
    n = n / 2;
    for ( j = 0; j < n; j++ ) {
        for ( i = 0; i < len; i++ ) {
            /* We need to read, modify, write here to look
               out for the write allocate policies. */
            buf[i] += tmp;
            /* Fake out some naive prefetchers */
            buf[len - 1 - i] -= tmp;
        }
        tmp += len;
    }
    buf_dummy = tmp;
    dummy( ( void * ) buf );
    dummy( ( void * ) &buf_dummy );
}

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void do_reads ( int n )

Definition at line 12 of file do_loops.c.

{
    int i, retval;
    static int fd = -1;
    char buf;

    if ( fd == -1 ) {
        fd = open( "/dev/zero", O_RDONLY );
        if ( fd == -1 ) {
            perror( "open(/dev/zero)" );
            exit( 1 );
        }
    }

    for ( i = 0; i < n; i++ ) {
        retval = ( int ) read( fd, &buf, sizeof ( buf ) );
        if ( retval != sizeof ( buf ) ) {
            if ( retval < 0 )
                perror( "/dev/zero cannot be read" );
            else
                fprintf( stderr,
                         "/dev/zero cannot be read: only got %d bytes.\n",
                         retval );
            exit( 1 );
        }
    }
}

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void do_stuff ( void )

Definition at line 250 of file do_loops.c.

{
    static int loops = 0;

    if ( loops == 0 ) {
        struct timeval now, then;
        gettimeofday( &then, NULL );
        do {
            do_flops( NUM_FLOPS );
            do_reads( NUM_READS );
            do_misses( 1, 1024 * 1024 );
            gettimeofday( &now, NULL );
            loops++;
        } while ( now.tv_sec - then.tv_sec < NUM_WORK_SECONDS );
    } else {
        int i = 0;
        do {
            do_flops( NUM_FLOPS );
            do_reads( NUM_READS );
            do_misses( 1, 1024 * 1024 );
            i++;
        } while ( i < loops );
    }
}