>> Ah, I see. The number measures the amount of processor time /allocated/
>> by the OS, not the amount of actual computation process made. Got it.
>
> Exactly. On my underpowered Stinkpad, TaskMangler will routinely report
> that the 2 cores are about 12-15% each, but the whole PC has become
> almost unresponsive since it's swapping and the swapfile sits on a
> software encrypted disk*, so the PGP task needs to be swapped in to
> encrypt/decrypt every swap file activity.
>
> *Don't ask. Company policy.

Now if a task isn't running because of swapping, /that/ should be quite 
easy for the OS to determine. (The OS deschedules it until the disk I/O 
request completes, after all...)

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