CPU not at 100% when rendering (E5 2690 V4)

[micmac]

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. 

[Ondra]

what resolution are you using?

[micmac]

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%.

[patrick.testa]

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%!)

[Ondra]

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?

[Alex Abarca]

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

[micmac]

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.

[Frood]

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

[micmac]

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

[Ondra]

it is in devel/debug settings under adaptivity

[micmac]

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