CPU Usage

buzzzzz1 · March 17, 2009, 11:00:32 AM

Hi! Happy St. Patrick's Day!

I have a render cooking and while watching the "task manager" I noticed the TG cpu usage is fluctuating. I'm rendering on 2 cores with minimum thread set at 2 and max at 16. CPU usage is going from 100% dropping to 97 then 50, up to 55 then back to 100. It continues to do this in 3 second cycles. Never noticed this before? Is this normal behavior?

Be sure to enjoy a green beer today.

My system specs are below.

neuspadrin · March 17, 2009, 11:08:04 AM

This is normal. I believe its when it starts up a new group of calculations cpu usage will drop slightly as its starts up then scale back up to full usage as it gets to cranking numbers, then drop again when new calculations are needed. Also some programs occasionally will steal a little cpu power to do something for themselves if you running anything in background or such.

buzzzzz1 · March 17, 2009, 11:22:39 AM

Oh, OK Thanks, I knew someone could explain that. Hmmmm? I wonder if I used Prealocate subdiv cache, would the render move along faster? Might have to try that and see. Thanks Again!

rcallicotte · March 17, 2009, 11:29:52 AM

Would you let us know, Buzzzzz? The CPU can be sort of an important part of what I do on my computer every day.

buzzzzz1 · March 17, 2009, 11:37:31 AM

Quote from: calico on March 17, 2009, 11:29:52 AM
Would you let us know, Buzzzzz? The CPU can be sort of an important part of what I do on my computer every day.

Sure, just tried checking Prealocate subdiv cache and it made little difference. Oh well, back to the render.

neuspadrin · March 17, 2009, 11:46:51 AM

isn't reallocate most useful in testing to see if something will happen memory wise later in the render? good for detecting errors earlier?

buzzzzz1 · March 17, 2009, 12:01:32 PM

Quote from: neuspadrin on March 17, 2009, 11:46:51 AM
isn't reallocate most useful in testing to see if something will happen memory wise later in the render? good for detecting errors earlier?

Yeah, I think so, like you said rather than getting almost to the end of a render to have it crash.

Hey, I'm just throwing things up against the wall to see what will stick. LOL Trying to get the most out of my cpu. Maybe when TG goes 64 bit I will see a difference?

Cheers!

rcallicotte · March 17, 2009, 01:04:33 PM

YAH, baby!!!

Quote from: buzzzzz1 on March 17, 2009, 12:01:32 PM
Maybe when TG goes 64 bit I will see a difference?

Cheers!

Moose · March 17, 2009, 01:33:38 PM

I believe it's the anti-aliasing (it must only be single threaded). I first noticed it when we got the new AA filters. Popping the filter back to Box (the old default, I believe) and you should notice less cpu time spent below 100%. Turning off AA Bloom helps too.

buzzzzz1 · March 17, 2009, 02:30:09 PM

Quote from: Moose on March 17, 2009, 01:33:38 PM
I believe it's the anti-aliasing (it must only be single threaded). I first noticed it when we got the new AA filters. Popping the filter back to Box (the old default, I believe) and you should notice less cpu time spent below 100%. Turning off AA Bloom helps too.

Ah! I see, thank you Moose.