int main(void){
// Unoptimized versions
diff = getdiff(iter);
printf("Unoptimized iter() function call time: \n%0.10f secs\n", diff);
diff = getdiff(ptr);
printf("Unoptimized ptr() function call time: \n%0.10f secs\n", diff);
// Optimized versions of these functinos
diff = getdiff(opt_iter);
printf("Optimized opt_iter() function call time: \n%0.10f secs\n", diff);
diff = getdiff(opt_ptr);
printf("Optimized opt_ptr() function call time: \n%0.10f secs\n", diff);
return 0;
}
gresser(){
function<diffv(const storage::storage_base*)> getdiff(&gresser::get_diff);
function<int(const storage::storage_base*, const diffv&, diffv&)> reduce(&gresser::reduce);
function<int(storage::storage_base*, const diffv&)> putdiff(&gresser::put_diff);
set_mixer(getdiff, reduce, putdiff);
}
int main(int argc, char **argv)
{
timespec ts1, ts2, diff;
struct sockaddr_rc addr = { 0 };
int s, status;
char dest[18] = "00:06:66:4B:45:7A";
// allocate a socket
s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
// set the connection parameters (who to connect to)
addr.rc_family = AF_BLUETOOTH;
addr.rc_channel = (uint8_t) 1;
str2ba( dest, &addr.rc_bdaddr );
// connect to server
status = connect(s, (struct sockaddr *)&addr, sizeof(addr));
if (status == -1) {
perror("connect");
return 1;
}
const size_t measures = 100;
size_t outbuf_len;
unsigned i;
double timearray[measures];
for (i=0; i < measures; i++) {
outbuf_len = sprintf(outbuf, "PING %u", i);
clock_gettime(CLOCK_REALTIME, &ts1);
if (write(s, outbuf, outbuf_len) == -1) {
perror("send");
return 1;
}
size_t accum = 0;
do {
int stat = read(s, inbuf+accum, outbuf_len-accum);
if (stat == -1) {
perror("recv fail");
return 1;
}
accum += stat;
} while ( accum < outbuf_len);
clock_gettime(CLOCK_REALTIME, &ts2);
diff = getdiff(ts1, ts2);
double diff_ms = diff.tv_sec*1000 +(double)diff.tv_nsec/1000000;
timearray[i] = diff_ms;
printf("%.*s diff: %fms\n"
, outbuf_len, inbuf, diff_ms);
}
double avg = 0, variance = 0, stddev = 0;
for (int i=0; i<measures; i++) {
avg += timearray[i];
}
avg /= measures;
for (int i=0; i<measures; i++) {
double tmp = timearray[i]-avg;
variance += tmp*tmp;
}
variance /= measures;
stddev = sqrt(variance);
printf("Avg: %.1fms std.dev: %.1fms\n", avg, stddev);
close(s);
return 0;
}
