Re: PowerBasic rocks!

Even with your values I still have problems with this :

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>


#define BIG_SIZE 64000000


int main(int argc, char **argv)
{
int i, j;
int32_t *mem;
int32_t *pmem;
int16_t *b;
int16_t *pb;
struct timeval *start_timeval;
struct timeval *current_timeval;
unsigned long lstart_usecs, lcurrent_usecs, ldiff_usecs;

fprintf(stderr, "memory needed=%d MB\n", ( (BIG_SIZE * sizeof
(int32_t) ) + (BIG_SIZE * sizeof(int16_t) ) ) / 1000000 );

mem = (int32_t*)malloc(BIG_SIZE * sizeof(int32_t) );
if(! mem)
{
fprintf(stderr, "could not allocate space for mem, aborting.\n");
exit(1);
}

b = (int16_t*)malloc(BIG_SIZE * sizeof(int16_t) );
if(! b)
{
fprintf(stderr, "could not allocate space for b, aborting.\n");
exit(1);
}

fprintf(stderr, "mem=%p\n", mem);
fprintf(stderr, "b=%p\n", b);

start_timeval = malloc(sizeof(struct timeval) );
if(! start_timeval)
{
fprintf(stderr, "could not allocate space for start_timeval,
aborting.\n");

exit(1);
}

current_timeval = malloc(sizeof(struct timeval) );
if(! start_timeval)
{
fprintf(stderr, "could not allocate space for current_timeval,
aborting.\n");

exit(1);
}

/* get start time */
gettimeofday(start_timeval, NULL);

for(j = 0; j < 10; j++)
{
pmem = mem;
pb = b;

for(i = 0; i < BIG_SIZE; i++)
{
*pmem += *pb;

pmem++;
pb++;
}
}

/* get elapsed time */
gettimeofday(current_timeval, NULL);

/* calculate the difference */
lcurrent_usecs =\
current_timeval -> tv_usec + (1000000 * current_timeval -> tv_sec);

lstart_usecs =\
start_timeval -> tv_usec + (1000000 * start_timeval -> tv_sec);

ldiff_usecs = lcurrent_usecs - lstart_usecs;

fprintf(stderr, "Time used is %d us (%.4f s).\n", ldiff_usecs, (float)
ldiff_usecs / 1000000.0);


fprintf(stderr, "Ready\n");

exit(0);
}

When I run that on the eeePC with 512MB RAM, I get these times:

eeepc-unknown:/root> ./test2
memory needed=384 MB
mem=0xa8a54008
b=0xa1041008
Time used is 13920337 us (13.9203 s).
Ready

Run repeatedly.
.

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