CPU usage in qualified RTEMS

General
1

Hello,

I am looking for a way to get the idle process percentage for all cores in pre-qualified RTEMS as return values to a function call, or similar. There seems to be some functionality in this direction in cpuuse.h, but it appears to write a stream of characters instead of simply providing the values directly.

Best regards,
Fredrik

2

We have an issue to track this as a feature request:

Feel free to add more there as well about what would be useful to you.

3

I have this change for the EPICS iocStats module. The piece of code in the commit is:

/*
 * See IEEE Std 1003.1-1988 (“POSIX.1”) for getrusage()
 */
static void cpu_ticks(double *total, double *idle) {
  struct rusage stats;
  double curActive;
  double curIdle;
  getrusage(RUSAGE_SELF, &stats);
  curActive = (double)stats.ru_utime.tv_sec + stats.ru_utime.tv_usec / 1e6;
  curIdle = (double)stats.ru_stime.tv_sec + stats.ru_stime.tv_usec / 1e6;
  *idle = curIdle - oldIdleUsage;
  *total = *idle + (curActive - oldActiveUsage);
  oldActiveUsage = curActive;
  oldIdleUsage = curIdle;
}
4

Thank you for your answers!

@kiwichris, I am afraid the getrusage() function call is unavailable in the pre-qualified version of RTEMS.

@gedare, thanks for directing me to that issue!