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  • VNext GPU unstable - how is Chaosgroup seeing development?

    It has been a while since Vray Next has been published and I have been part of the earliest Beta tests - and I love it just like the next guy.

    I would like to ask how you, Chaosgroup, are seeing the development and how content you are and what the plans are?

    I am more talking about stability than any new features here.

    To be honest I was quite astounded when Vlado said at Total Chaos 2018 that Vray Next will be available the week after, because I had so much instability troubles that I didnt think it was a finished and polished product, at least not with GPU rendering.
    One year afterwards I am still getting lots of errors, and when I have time I keep sending in scenes and it seems to get better little by little. But it is scary, to be honest.
    I have this interior scene, which, with midmapping, still has a few gigs until my 1080ti is full, so I would assume it is not a memory issue. But from time to time - and this is the real trouble - rendering will not work and errors vary. Sometimes unhandled exception, sometimes the GPU is not recognized, sometimes something else. And sometimes rendering just works. I am already kind of used to opening two 3ds max instances, so when rendering doesnt work (and when it wont work, trying another render wont work either, so...) I can just re-open the same scene and start rendering again. (Just last night I had rendering I knew would take a few hours, so before going to bed I wanted to start it. It took me three attempts so that I could safely leave the PC and so to speak rest in peace). And most of the time that will solve the issue, sometimes I have to restart the PC and then rendering will work fine. It is so random. And this is not the only scene I had this trouble with.
    Of course, I will send the scene to support and maybe something will be figured out, but this has happened to me several times, a LOT of time actually during the last year. Sometimes I resolved the issue by importing everything from one scene to an empty one. I never had so many errors and trouble with CPU rendering. And right now I have a big job that could really use the GPU power, but because of this trouble I am scared and will do everything in CPU, which is really a shame, cause I love GPU rendering.
    Saying that, I believe in the product and will invest in a new PC with two 2080tis and maybe more GPUs to add later on; maybe a new PC will solve everything? lol
    But kidding aside, this is very serious stuff for everyday production...

    This instability cant be unknown to you, since I would guess you get a lot of reports from all over the world. For a lot of people GPU rendering works like a bliss obviously, but I cant be the only person who has these problems so much that I cant fully jump ship to GPU.
    What is the offiicial comment here, please?
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  • #2
    Such instability happening only on your computer and not consistently might not be V-Ray GPU fault. Drivers, hardware and other things might come into play.
    ”it is not stable, please fix” is hard to answer, as obviously it works for many. AFAIK there are no known crashes at all.
    An examples always help a lot to make clear what doesn’t work for you.

    Best,
    Blago.
    V-Ray fan.
    Looking busy around GPUs ...
    RTX ON

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    • #3
      That's not what I said . It's not stable, please fix . That's not possible without more information. But from my point of view its not getting better, no matter how much I send .
      what I wanted to know and what you answered more or less is the fact that vnext gpu seems very stable to you and most users .
      So it must be my hardware... ? Since I already reinstalled windows from scratch and still vnext seems unstable it can only be that... It's bewildering though.... Like a needle in a haystack .
      let's see what the new pc will bring. ;(
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      • #4
        Although a follow up:
        IF it's a driver or hardware issue, it should be possible to find no?
        What would you recommend?
        Clean windows re install - check
        Multiple driver re-installs - check
        Tested gpu with a benchmark Software - Check
        Cleaned the registry - check

        What else to do? I'd hate to lose my more than expensive hp workstation...
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        • #5
          Originally posted by MANUEL_MOUSIOL View Post
          This instability cant be unknown to you, since I would guess you get a lot of reports from all over the world.
          We are not getting more reports about the GPU compared to the regular V-Ray. It doesn't mean that there aren't issues, but it doesn't seem to be as bad as it is for you in general.

          What is the offiicial comment here, please? What else to do? I'd hate to lose my more than expensive hp workstation.
          We can help you best if we have some way to reproduce the problems. We can also get you access to the nightly builds, in case some of those issues are already fixed - you can email me to vlado@chaosgroup.com about this.

          sometimes the GPU is not recognized
          This is odd; what do you mean by "it is not recognized"?

          Best regards,
          Vlado
          I only act like I know everything, Rogers.

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          • #6
            Could be user error IMO

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            • #7
              Originally posted by squintnic View Post
              Could be user error IMO
              I am sure it has to be human error. Not sure if its me, just pressing the render button and getting random results on GPU while CPU is totally stable; or probably the other things that are made by humans/users of matter. Anyway, your comment doesnt really help me figure out my problems; thanks for the input though. I will go meditate about my errors.

              Vlado, thanks for the offer. I do have access to the nightlies and from time to time I switch to the latest builds and test them out; but since i am still getting errors more than I would like, I switched back to the official build some weeks ago, since I cant afford to troubleshoot while in production, and I need to use a render farm for this project right now.
              But of course I will send the scene. It is quite heavy and I am busy, so it will take a while. Maybe I can today.
              I would have to get the GPU error again to get you the exact phrase the log spits out, but it essentially says that the 1080ti is not being recognized as a usable device or something. Next time I restart max or my pc the GPU works fine. I am using it with a quadro k4000 for display btw. maybe there is an issue...I dont know.
              And I dont know how to find out what makes my system so unstable when it comes to vray gpu...

              again, if you know how to check that in some way, I would be greatful.
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              • #8
                Don't use older kepler cards in production (even for display and viewport performance). They will cause issues with Nvidia drivers in windows 10 and they are outdated/offer very bad performance
                just swap it for something like a 1060 6 GB for example, it should be at 200 Euros
                Next GPU has been very reliable for me, using it for all my work since 3.6
                Many other people have been using it in production without issues
                You should probably send your scene to support and see if they can reproduce the errors you get. If they cannot, this means you should probably invest in new hardware
                Muhammed Hamed
                V-Ray GPU product specialist


                chaos.com

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                • #9
                  Originally posted by MANUEL_MOUSIOL View Post
                  And right now I have a big job that could really use the GPU power, but because of this trouble I am scared and will do everything in CPU
                  For serious work you shouldn't use a 6 year-old, outdated GPU in your system that sells for 50 USD now, it will mess up your drivers and cause many issues(I know u are using the 1080Ti for GPU rendering)
                  This has nothing to do with development of Vray GPU really..
                  Muhammed Hamed
                  V-Ray GPU product specialist


                  chaos.com

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                  • #10
                    Originally posted by Muhammed_Hamed View Post

                    For serious work you shouldn't use a 6 year-old, outdated GPU in your system that sells for 50 USD now, it will mess up your drivers and cause many issues(I know u are using the 1080Ti for GPU rendering)
                    This has nothing to do with development of Vray GPU really..
                    ok, thanks for the info.
                    that is the first time I heard to this problem. On the contrary, chaosgroup told me or someone else on the forums that using the quadro for display is fine.
                    But good to know, I will swap the display GPU and see how it goes. Would be great if this solves all my troubles.
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                    • #11
                      Btw, just my two cents - I totaly missed gpu rendering part, since my card was 980, for about 5 years. Now, me using 2080ti and hybrid rendering is a freaking nice! The only problems me having atm with it - failing threading errors, which stops both cpu and gpu. And you should restart your job, but since me using deadline and vray standalone it is a matter of seconds to restart. Tho, in max it was annoying sometimes, but it was my first days, when I pushed my 2080ti to its limits, rising gpu/ram clocks. And while it works stable to me at 2000mghz/8000mghz (48seconds in vraybench, which is blazingly fast) sometimes threading errors appeared. Now Im at stock - no problems so far.
                      I just can't seem to trust myself
                      So what chance does that leave, for anyone else?
                      ---------------------------------------------------------
                      CG Artist

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                      • #12
                        Originally posted by MANUEL_MOUSIOL View Post

                        ok, thanks for the info.
                        that is the first time I heard to this problem. On the contrary, chaosgroup told me or someone else on the forums that using the quadro for display is fine.
                        But good to know, I will swap the display GPU and see how it goes. Would be great if this solves all my troubles.
                        Nothing is wrong with mixing Quadros and Geforce/RTX cards
                        Problem is using old Quadro cards like the k4000 with new drivers in Windows 10, this causes many issues
                        Stick to Maxwell/Pascal/Turing architecture...
                        Muhammed Hamed
                        V-Ray GPU product specialist


                        chaos.com

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                        • #13
                          Originally posted by Muhammed_Hamed View Post

                          Nothing is wrong with mixing Quadros and Geforce/RTX cards
                          Problem is using old Quadro cards like the k4000 with new drivers in Windows 10, this causes many issues
                          Stick to Maxwell/Pascal/Turing architecture...
                          I was actually referring to the k4000 or rather 4200. It will work ok as far as I heard. But apparently not .
                          not going to buy another quadro anyway. Too expensive for rendering.
                          Thanks!

                          Now I should really look into deadline finally..
                          paul what is your workflow exactly? You export your scene to standalone first and then submit to deadline?
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                          • #14
                            Well, it is mixed. Using both Maya, max, sometimes houdini....
                            I just can't seem to trust myself
                            So what chance does that leave, for anyone else?
                            ---------------------------------------------------------
                            CG Artist

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