Vray GPU extremely long pause between frames

[christian_ludvigsen]

Hi there

Trying to render a 600k particlesystem ( tyflow ) with vray gpu. As such it renders correctly but between each frame I have to wait a really long time ( several minutes ), while render dialog reads "V-Ray starting rendering..."
The waiting time makes the total rendertime substantially slower than rendering with cpu
Is there anything i can do to avoid this waiting time?

newest nvidia driver, vray 5 GPU update 2
TR 3970x and 3080rtx 10gb

[Muhammed_Hamed]

Thanks for the report Christian, we are looking into this now. It is not expected to happen
I will update you soon

Best,
Muhammed

[doppelgaengerdigital]

I just started testing Vray GPU with a rtx 4090.
while the speed is good for single frame rendering,
I get the same issue when batch rendering animations or over the farm.


I tested with your scene file here.
here. The lag between frames is about 1-2min, where CPU is busy. I guess the scene gets reloaded in between. https://static.chaos.com/documents/a...zip?1665749029

i tried checking all caching overrides in the settings without success.

I am running win11 and vray 6.0.0.2 from 01.02. stable builds on maya 2023


Edit:
Tested against my little farm of 2x2990wx (OC) and 1x3970x: time for 15 frames: ~20min
15 frames locally on RTX4090: 25min
I guess this could be almost halved, if the waiting time in between drops significantly.

[Muhammed_Hamed]

doppelgaengerdigital Thanks for the testing and feedback!
Just letting you know this topic is near the top of our current priorities, we are looking into ways to solve/improve this

Best,
Muhammed

[doppelgaengerdigital]

Hi Muhammed!

Thanks for the information! Looking forward to a fix for this, as this makes rendering animations over GPU not quite effective against my little CPU farm.
I still have to convince myself of a expensive GPU being a good investment for my current workflow.

Many things to consider...which you don't have with CPU rendering.

[s_gru]

i have this issue as well. it seems worse since i switched from 1080ti cards to 4080 cards and updated to latest nvidia drivers and vray version. max2022 and also msi afterburner shows cards utilization up/down during render as well as opposed to solid 100% utilization during render (plus utilization drops between frames)

[Muhammed_Hamed]

i have this issue as well. it seems worse since i switched from 1080ti cards to 4080 cards

It is expected with high-end GPUs like the 4080, the delay between frames is something we are working on at the moment
About GPU utilization, stick to progressive image sampler and use the least amount of render elements. This is going to help a lot
Improving GPU utilization is also on the GPU roadmap

Best,
Muhammed

[s_gru]

thanks. saw other post too. sorry to double post.

[Muhammed_Hamed]

Hello,

This should be improved in V-Ray 6 update 2, V-Ray GPU will cache textures after the first frame

Best,
Muhammed