COG Utilisation

simonl

Has anyone got any code that would give an idea of % cog utilisation (before I have a go myself) ?

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...or anyone got any ideas as to how I might achieve it?

I'm thinking that I might need some sort of polling of global var's that get updated by each (working!) cog. But not sure what each cog will need to do to arrive at a % utilisation figure.

Oh, and I guess I'm gonna have to get down-and-dirty with integer maths too [noparse]:([/noparse]
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Cheers,

Simon

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www.norfolkhelicopterclub.co.uk
You'll always have as many take-offs as landings, the trick is to be sure you can take-off again ;-)

Post Edited (simonl) : 1/23/2007 4:16:26 PM GMT

asterick

Are you talking like CPU used?

The only time the cog is ever waiting is when it's stopped, or when it's executing a WAITPEQ WAITPNE WAITCNT and WAITVID. The only way you can really solve how many cycles are used is by wrapping something like this:

mov old, CNT
waitcnt Target,Delta wr
sub  old, CNT
ADD cyclesWasted, old

(That treats the move's as 'wasted' too)

The down side to using this is counter rollover (happens just under once a minute), and if you're doing video, you're likely to throw your timing off if you're squeezing out every cycle that you can (which almost anything dealing with VGA seems to be extremely fond of)

As far as determining how many cogs are used, you can do a repeating loop that uploads a JMPRET 0, #0 to as many cogs as it can before none are free...

Other than that, I'm out of ideas.

Post Edited (asterick) : 1/23/2007 6:33:49 PM GMT

parsko

Simon,

There is a cog counter. Not sure if this helps...

Should be straightforward how to use it.

-Parsko

PS- I think PhiPi wrote it, not me

simonl

Thanks for the replies guys, gives me food for thought.

Asterick: You've raised an excellent point, of course; I guess I'm trying to see how much time a COG is 'idle' / looping awaiting something useful. I've not got my head around that yet -- coz if it's looping it can't be 'idle' can it?! I guess I'm thinking of something like the 'Performance' tab in Windows Task Manager... (BTW: Love GEAR, you're a genius!)

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Cheers,

Simon

---

www.norfolkhelicopterclub.co.uk
You'll always have as many take-offs as landings, the trick is to be sure you can take-off again ;-)