Not releasing memory in RTX mode

V-Ray V-Ray GPU Issues
1

Hi,
Is there any update regarding this problem? Vray GPU RTX became practically unusable for animations since this problem occurred in V-Ray 6 update 2.1 and it still hasn’t been resolved in V-Ray 7.
Switching to CUDA is of course possible but the speed advantage of RTX over CUDA is huge on RTX4090 cards and a big deal in productions.

Thanks,
Lars

2

That explains why I am crashing on animations that I was able to render before - out of memory 2/3 of the way in.

3

Confirming same appears to be happening on still renderings, with Rhino 8.14, Vray 6.20.06, Nvidia 566.14, Windows 11 Pro.
Also, If I stay inside Rhino & close/open files, it seems to be worse.
Only way to clear it is to exit Rhino, then restart Rhino.
and I’m using system memory for textures option.
Glenn
Ryzen 9 7900X, 64GB (2x32), Nvidia RTX 4070TI

4

Indeed it’s also still renderings. Render a few stills or firing up IPR a couple of times and 3dsmax has to be restarted to release the GPU memory.

5

Usually, V-Ray GPU does cache some information so as not to load it several times, hence increasing performance, however what @lars_snelders is talking about sounds like a memory leak. Please, send the scene in question via the contact form so we can troubleshoot.

EDIT: A similar issue was reported a while ago, but it should be fixed. It won’t hurt to install the latest V-Ray 6 stable build and see if the issue persists.​ Also, ensure you’re using the recommended %20for%20Quadro%20%26%20Tesla%20cards.)NVidia Drivers since using newer ones may cause issues.

6

Thanks for your reply,
Looks indeed like a memory leak. It’s not happening with one particular scene but with every scene when using RTX mode, but I will collect and send the latest file I’m working on over the weekend.
I’m using 3dsmax 2024, latest V-Ray 7, WIN10, Nvidia Studio Driver 566.14

7

Thanks for the information Lars, we are looking into this now

Best,
Muhammed

8

Hi Lars,
Did you send us the file?

9

Hi @Muhammed_Hamed ,

Thanks for looking into this.
Yes I send a Dropbox link yesterday and uploaded the archived scene this morning via the secure file upload.

10

Thanks!

We reproduced on our side, I will update the thread when we release a fix(ASAP)

Best,
Muhammed

11

Good you were able to reproduce! Thanks again and looking forward to the fix :slight_smile:

Cheers

12

@Muhammed_Hamed @lars_snelders
I just noticed that toggling “Sys Mem for Textures” in between renders frees up VRAM.
Glenn

13

Update, this issue seems to be related to the newer drivers. Driver 552 and 551 don’t have the memory leak
We are working with Nvidia now on a fix, hopefully in a new driver
FYI, don’t use driver 560.xx or 555.xx because of other issues

Best,
Muhammed

14

Thanks for the update @Muhammed_Hamed .
Would you recommend switching to 552 or 551 for the time being? The oldest I can find on Nvidia’s website is the Game Ready driver 552.44

15

552.44 should work fine, that being said it doesn’t include the recent security patch. We cannot change the recommended driver of V-Ray GPU
We will try our best to solve this with Nvidia as soon as possible

16

@Muhammed_Hamed I just tried the new studio driver that was released today and there is an improvement but it’s not solved. The test scene I send you earlier now slows down around frame 40 instead of frame 10. So it definitely leaks less..

17

I have the same issue (see this thread for more details: V-Ray GPU Not releasing memory in RTX mode when using Progressive sampling - V-Ray GPU :: Issues - Chaos Forum).

64GB apparently is not enough to render a simple scene a few times in a row (without 3ds max restart). How can I fix this issue please?

18

@lars_snelders @Muhammed_Hamed
Confirming studio driver 572.16 appears to be working correctly (with stills, I don’t make animations). Releasing Vram shortly after rendering and I use the “system memory for texture” option. That seems to be using less as well, or not stacking/leaking like 566.14 did.
Based on same file for both drivers, 572.16 was installed then system restart. Significantly less Vram usage and holding right after render completed.
Vray 6.20.06, Rhino 8.15
Ryzen 9 7900x, 64GB, RTX-4070TI OC,
Glenn

19

Hi Lars,

We have been investigating this last week, I will message you with a conclusion soon

Best,
Muhammed

20

Thanks for confirming!
I’m glad it works now, we are checking other scenes that were problematic on our side

Best,
Muhammed