PercentIdleTime value is empty

I have a strange behavior using WMI to get PercentIdleTime information from Win32_PerfRawData_PerfOS_Processor.

The Idle value is correct for all processors but is not retrieved for "_Total" instance.

What might be the problem? How can i rectify that problem?

Guide me.

Does it even make sense to talk about idle time for _Total? Would this count only the time when all processors were idle? One processor was idle? More than half were idle?

Why not? If one core isn't idle at all, and one is completely idle isn't your dualcore processor 50% idle in total?

Anyway, works fine here

Thanks for your reply.

But the problem i have mentioned only come in Windows XP machine. Its working fine in other windows releases.


What might be the problem? Guide me.

Any update on this problem..................

So XP doesn't provide that information...

Code:

---

// pseudo-code

If (IdleTime = 0)
  Usage  = (core 1 + core 2) div 2
else
  usage = IdleTime

---

And that's a problem because?

Or if you really hate yourself, but want the same results the OS gets, use the performance counters. I think the path you want is "\Processor\% Idle Time\_Total", but I'm not in a position to test it at the mo.