On 05/07/2012 08:25 PM, Warp wrote:

> What the number is telling is how many virtual cores are being used at
> the moment by that process (assuming that it's using all of the virtual
> cores fully).

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.

So if a task spends most of its time idle due to cache misses or sharing 
executing units with a second hyperthreaded task, or whatever, the OS 
can't easily measure that.

I guess the thing to do then is to look at the actual throughput 
achieved by all the tasks. Both POV-Ray and Virtual Dub report this 
information. (POV-Ray reports pixels/second, Virtual Dub reports 
frames/second transcoded.)



Incidentally, does anybody /else/ find POV-Ray's PPS display annoying? 
It seems to display the arithmetic mean over the entire image, which is 
just /wrong/.

1. It means that if the speed increases or decreases for any reason, the 
display takes a /long/ time to respond. I'd prefer to see an 
instantaneous speed readout.

2. It includes any mosaic preview or radiosity pretrace rendering, which 
has completely different speed characteristics.

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