how to monitor the child process on which cpu core

yanglei_fage · #1 (**permalink**) 06-28-2009

Hi all.
Sorry to express my questions wrongly in my early post,I repost my question again here.
My pc has dual core, I wirte an application with two process, parents process and child process.
My quetion is
how to realize :if the child process is on core 0,it will tell me I'm on core 0,if it is on core1, it will tell me I'm on core 1

I have do some try, if I just add "printf(my pid is %d on core %d,getpid(),sched_getcpu), it outpout just *one*states that which core it is on.you know child process is not just on core 0 or 1 one time.

How to realize above, do we need wrtie a monitor application, can some one give me an example?

Quote:

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
int main ()
{
pid_t child_pid;
printf (“the main program process ID is %d\n”, (int) getpid ());
child_pid = fork ();
if (child_pid != 0) {
printf (“this is the parent process, with id %d\n”, (int) getpid ());
printf (“the child’s process ID is %d\n”, (int) child_pid);
}
else
{
// child process , I want to mornitor which core it run on.
}
}

otheus · #2 (**permalink**) 06-30-2009

Did you mention what OS? If Linux, you can look at /proc/self/stat and depending on the version of your kernel, one of the fields will represent the processor most recently executed on. You can look at the manpage for "proc" to find out which field. You can get the parent id of the process using getppid() and look in /proc/$PPID/stat for the same info.

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