int _tmain(int argc, _TCHAR* argv[])
{
if(MAIN_DELAY_SECONDS > 0)
delay_start();
PandemicSim *sim = new PandemicSim();
sim->timeSimulation();
getchar();
}
static int
delimit_session(char **argv)
{
struct timeval time_start, time_end;
time_t the_time;
struct rusage ru;
unsigned left_over;
pid_t pid;
int status;
int ret = 0;
/*
* take care of the easy case first: no command to start
*/
if (argv == NULL || *argv == NULL) {
if (options.trigger_delay && delay_start() == -1)
return -1;
/*
* this will start the session in each "worker" thread
*/
pthread_barrier_wait(&barrier.barrier);
time(&the_time);
vbprintf("measurements started on %s\n", asctime(localtime(&the_time)));
the_time = 0;
if (options.session_timeout != PFMON_NO_TIMEOUT) {
printf("<session to end in %u seconds>\n", options.session_timeout);
left_over = sleep(options.session_timeout);
if (left_over)
pfmon_print_quit_reason(quit_reason);
else
time(&the_time);
} else {
printf("<press ENTER to stop session>\n");
ret = getchar();
if (ret == EOF)
pfmon_print_quit_reason(quit_reason);
else
time(&the_time);
}
if (the_time) vbprintf("measurements completed at %s\n", asctime(localtime(&the_time)));
return 0;
}
gettimeofday(&time_start, NULL);
/*
* we fork+exec the command to run during our system wide monitoring
* session. When the command ends, we stop the session and print
* the results.
*/
if ((pid=fork()) == -1) {
warning("Cannot fork new process\n");
return -1;
}
if (pid == 0) {
pid = getpid();
if (options.opt_verbose) {
char **p = argv;
vbprintf("starting process [%d]: ", pid);
while (*p) vbprintf("%s ", *p++);
vbprintf("\n");
}
if (options.opt_pin_cmd) {
vbprintf("applied cpu-list for %s\n", *argv);
if (pfmon_set_affinity(pid, options.virt_cpu_mask)) {
warning("could not pin %s to cpu-list\n");
}
}
/*
* The use of ptrace() allows us to actually start monitoring after the exec()
* is done, i.e., when the new program is ready to go back to user mode for the
* "first time". With this technique, we can actually activate the workers
* only when the process is ready to execute. Hence, we can capture even
* the short lived workloads without measuring the overhead caused by fork/exec.
* We will capture the overhead of the PTRACE_DETACH, though.
*/
if (options.trigger_delay == 0) {
if (ptrace(PTRACE_TRACEME, 0, NULL, NULL) == -1) {
warning("cannot ptrace me: %s\n", strerror(errno));
exit(1);
}
}
if (options.opt_cmd_no_verbose) {
dup2 (open("/dev/null", O_WRONLY), 1);
dup2 (open("/dev/null", O_WRONLY), 2);
}
execvp(argv[0], argv);
warning("child: cannot exec %s: %s\n", argv[0], strerror(errno));
exit(-1);
}
if (options.trigger_delay) {
if (delay_start() == -1) {
warning("process %d terminated before session was activated, nothing measured\n", pid);
return -1;
}
} else {
vbprintf("waiting for [%d] to exec\n", pid);
/*
* wait for the child to exec
*/
waitpid(pid, &status, WUNTRACED);
}
/*
* this will start the session in each "worker" thread
*
*/
pthread_barrier_wait(&barrier.barrier);
/*
* let the task run free now
*/
if (options.trigger_delay == 0) ptrace(PTRACE_DETACH, pid, NULL, NULL);
ret = wait4(pid, &status, 0, &ru);
gettimeofday(&time_end, NULL);
if (ret == -1) {
if (errno == EINTR) {
pfmon_print_quit_reason(quit_reason);
ret = 0; /* will cause the session to print results so far */
} else {
vbprintf("unexpected wait() error for [%d]: %s\n", pid, strerror(errno));
}
} else {
if (WEXITSTATUS(status) != 0) {
warning("process %d exited with non zero value (%d): results may be incorrect\n",
pid, WEXITSTATUS(status));
}
if (options.opt_show_rusage) show_task_rusage(&time_start, &time_end, &ru);
}
return ret;
}
