Vray distributed rendering lazy nodes

V-Ray for 3ds Max V-Ray for 3ds Max :: General
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1

Hey!

Is it normal that while DR on a scene that has a high quality settings, that nodes start to render after a long time (a better part of an hour)?
I see in my V-Ray message window that the scene is loaded and all the nodes are starting frame, but then nothing happens (i.e. only the main station is rendering) for quite a long time.
So is this normal, because I thought that as soon as all the assets are downloaded from network the nodes should start to render, no?:face_with_spiral_eyes:

2

Is this still the case if you turn off the “Use local host” option in the DR settings?

Best regards,
Vlado

3

Won’t that mean that my main station won’t render? I want it to render also, is just that the nodes start rendering really late. Maybe is this particular scene, but what is strange is, is that it was working fine before even on this scene..

4

Yes, of course; I just want you to do it as a test, so that I can figure out what my next recommendation for you would be.

Best regards,
Vlado

5

oh, ok.
Well I did a regeion test render and after half an hour it was still on phase prepas 1, but I didn’t see any buckets or anything, so I canceled it. In message window it said the scene was loaded on all nodes though.

6

Ok, I’ll need a bit more information; if this always happens in this scene, can you send it to support@chaosgroup.com so that we can check what’s wrong? If it’s not possible, can you get me the V-Ray log file from one of the render servers while it is stuck?

Best regards,
Vlado

7

just a thought - can this be becouse I have less RAM in my nodes?
Although its funny becouse usually it worked fine, even in this scene in the start.:face_with_spiral_eyes:

8

Maybe, or maybe not. You could find out if you open a task manager on one of the nodes and check what’s going on (i.e. CPU and RAM usage).

Best regards,
Vlado

9

I think it has to do something with vray displace mod. As soon as I turned it off, my nodes started to render a lot quicker. So I guess it probably is a RAM issue.

10

I have 10 nodes + my workstation and I see this behavior a lot even when not using displacement. When I have the DR machines render alone on a small scene using less than 5 gigs of ram the prepass stage takes a very long time. It will sit there for about 2.5 minutes before the prepass progress bar shows any progress, once the progress begins it goes very quickly and the rendering starts immediately after that. It seems like it’s taking a long time for the nodes to begin calculating the prepass, I thought it might be because it was taking a long time to load but watching the network activity that doesn’t seem to be the case. The scene I’m talking about only has about 600K poly’s with about 500 mb of maps and no displacement.

11

Is this repeatable with this particular scene?

Best regards,
Vlado

12

Yes it is.

13

Perfect, can you send it to support@chaosgroup.com so that we can figure out what’s wrong?

Best regards,
Vlado

14

I will, thank you.

15

Old thread I know, but it’s exactly my problem.
When I enable displacement the nodes come to life only after a very long time. Is there some known solution?
I’m using V-Ray 2.00.26563 for Rhino


Thanks!

16

Does the issue occur on every scene or just on particular one/ones.
What is the Cpu and Ram usage of the render nodes before their buckets appears in the frame buffer?
Is there any difference if you decrease the displacement settings?

17

The RAM was maxed out on all nodes, they started to page to disk.
I tried every setting related to displacement but it did nothing. After a general reset of all the settings, I was able to complete the render and now it renders fine. Frustrating that I can’t know what was the culprit this way


18

Have you got a backup version of the scene with the old settings? If yes it wouldn’t be so difficult to find what cause the excessive RAM usage.

19

I’ll check and do some tests, thanks.