int main(int argc, char ** argv)
{
time_t start, end;
time_t run_time;
unsigned long i;
pid_t pids[NUM_OF_CORES];
/* start of test */
start = time(NULL);
for (i = 0; i < NUM_OF_CORES; ++i) {
if (!(pids[i] = fork())) {
do_primes();
exit(0);
}
if (pids[i] < 0) {
perror("Fork");
exit(1);
}
}
for (i = 0; i < NUM_OF_CORES; ++i) {
waitpid(pids[i], NULL, 0);
}
end = time(NULL);
run_time = (end - start);
printf("This machine calculated all prime numbers under %d %d times "
"in %d seconds\n", MAX_PRIME, NUM_OF_CORES, run_time);
return 0;
}
int main(int argc, char ** argv)
{
int numCores, maxPrime;
if (argc < 3) {
printf("Not enough arguments. arg 1 = NUM_OF_CORES. arg 2 = MAX_PRIME\n");
printf("Example: ./a.out 4 1000\n");
printf("Switching to default values for Cores: %d and Max Prime: %d\n", NUM_OF_CORES, MAX_PRIME);
numCores = NUM_OF_CORES;
maxPrime = MAX_PRIME;
}
else {
numCores = atoi(argv[1]);
maxPrime = atoi(argv[2]);
printf("Began CPU load test with %d cores and the max prime being %d\n",
numCores, maxPrime);
}
time_t start, end;
time_t run_time;
unsigned long i;
pid_t pids[numCores];
/* start of test */
start = time(NULL);
for (i = 0; i < numCores; ++i) {
if (!(pids[i] = fork())) {
do_primes(maxPrime);
exit(0);
}
if (pids[i] < 0) {
perror("Fork");
exit(1);
}
}
for (i = 0; i < numCores; ++i) {
waitpid(pids[i], NULL, 0);
}
end = time(NULL);
run_time = (end - start);
printf("This machine calculated all prime numbers under %d, %d times "
"in %ld seconds\n", maxPrime, numCores, run_time);
return 0;
}
int main(int argc, char **argv)
{
pid_t pid;
int i;
int policy;
struct sched_param param;
if (argc != 2){
perror("incorrect arguments");
exit(0);
}
if (!strcmp(argv[1], "SCHED_OTHER")) {
policy = SCHED_OTHER;
}
else if(!strcmp(argv[1], "SCHED_FIFO")){
policy = SCHED_FIFO;
}
else if (!strcmp(argv[1], "SCHED_RR")){
policy = SCHED_RR;
}
else{
perror("Scheduling policy not understood\n");
exit(EXIT_FAILURE);
}
/* set process to max priority for given scheduler */
param.sched_priority = sched_get_priority_max(policy);
if(sched_setscheduler(0,policy,¶m)){
perror("Error setting scheduler policy");
exit(EXIT_FAILURE);
}
while(1)
{
do_primes();
sleep(1);
}
return 0;
}
