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Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: micmac on 2017-02-17, 19:53:59

Title: CPU not at 100% when rendering (E5 2690 V4)
Post by: micmac on 2017-02-17, 19:53:59

Hello, i just bought a new workstation with 2 CPU E5 2690 V4. My problem is that, during render, every 6 seconds all cpu qoes down to 70 % during 1 or 2 seconds.  Is there a way to fix this problem?
I read stuff about avx problems but i don't just don't understand... my english is limited.
 
Thanks for your answer. 

Title: Re: CPU not at 100% when rendering (E5 2690 V4)
Post by: Ondra on 2017-02-20, 15:37:27

what resolution are you using?

Title: Re: CPU not at 100% when rendering (E5 2690 V4)
Post by: micmac on 2017-02-20, 19:17:26

Hello Ondra.
I've done some test:
__640*480    : it happens every 3 seconds and go to 80% of cpu max usage.
__1640*1480:                 every 24 seconds and go to 50% of cpu max
__2640*2480:                 every 70 seconds and go to 10%
__3640*3480:                 every 2min and 8 seconds, go to 2%.

Title: Re: CPU not at 100% when rendering (E5 2690 V4)
Post by: patrick.testa on 2017-02-20, 19:35:41

Hello,
I have a similar problem. If I put the PC to sleep, after it wakes up it only uses 30% of all the cores of the CPU... (Intel i7 6800 @3.4GHz)
If I reboot it works fine again. I've tried to Google for this problem but I've found nothing.
(If I render with scanline it uses even less CPU, around 8%!)

Title: Re: CPU not at 100% when rendering (E5 2690 V4)
Post by: Ondra on 2017-02-20, 21:05:15

Quote from: micmac on 2017-02-20, 19:17:26

Hello Ondra.
I've done some test:
__640*480    : it happens every 3 seconds and go to 80% of cpu max usage.
__1640*1480:                 every 24 seconds and go to 50% of cpu max
__2640*2480:                 every 70 seconds and go to 10%
__3640*3480:                 every 2min and 8 seconds, go to 2%.

ok, it is the adaptivity recalculation. It may be normal - because you have so many threads, you are noticing the drop as the rendering needs to be temporarily stopped to recalculate adaptivity. You can change adaptivity recalculation interval if this annoys you, but it is probably not doing any harm. Can anyone with similar CPu confirm the behavior?

Title: Re: CPU not at 100% when rendering (E5 2690 V4)
Post by: Alex Abarca on 2017-02-20, 23:43:56

I have exactly the same set up. Do I test against a benchmark model?

Title: Re: CPU not at 100% when rendering (E5 2690 V4)
Post by: micmac on 2017-02-21, 08:45:46

Hello Ondra, thx for the reply.
Alex, this problem didn't happen with the 1.3 benchmark.
Just create a simple scene (whatever u want) and press render.

Title: Re: CPU not at 100% when rendering (E5 2690 V4)
Post by: Frood on 2017-02-21, 08:48:12

Happens here also on the 2x2670 nodes and yes it´s the adaptivity recalculation. I have no problem with this although for me it would still be more useful to have the recalc interval time dependend, not pass dependend.

Good Luck

Title: Re: CPU not at 100% when rendering (E5 2690 V4)
Post by: micmac on 2017-02-22, 22:28:37

Ondra, where can i change this setting? (adaptivity recalculation)

Title: Re: CPU not at 100% when rendering (E5 2690 V4)
Post by: Ondra on 2017-02-23, 11:20:09

it is in devel/debug settings under adaptivity

Title: Re: CPU not at 100% when rendering (E5 2690 V4)
Post by: micmac on 2017-02-23, 11:23:56

ok! that's why i can't find it!