VMD-L Mailing List

From: Bart Bruininks (b.m.h.bruininks_at_rug.nl)
Date: Wed Jun 10 2020 - 11:07:58 CDT

The suggested solution did indeed solve the issue. Thanks!

bash:
export VMDOPTIXDESTROYCONTEXT=1

Op wo 10 jun. 2020 om 17:58 schreef Bart Bruininks <b.m.h.bruininks_at_rug.nl>:

> This occurs with OPTIX on and two graphics cards over a NIVE DCV service.
> If you would like, I could ask which exact version we are running for NICE.
> I added a short video which hopefully illustrates the issue clearly. I will
> see if the suggested helps and report the results when I have them.
>
> Op wo 10 jun. 2020 om 17:06 schreef John Stone <johns_at_ks.uiuc.edu>:
>
>> Bart,
>> I haven't had the GPU run out of memory, but I've been observing an
>> unexplained performance loss anomaly with a simple movie rendering
>> test that just renders a virus scene in a tight loop a few hundred
>> times. I haven't seen GPU memory use climb noticably in my test, but
>> I will keep an eye out for this.
>>
>> If I understood your symptoms, you encounter the problem when RTX is
>> enabled, but NOT if RTX is disabled?
>>
>> What happens if you set this environment variable before you run VMD:
>> bash:
>> export VMDOPTIXDESTROYCONTEXT=1
>> csh:
>> setenv VMDOPTIXDESTROYCONTEXT 1
>>
>> Best,
>> John
>>
>> On Wed, Jun 10, 2020 at 03:05:10PM +0200, Bart Bruininks wrote:
>> > Dear VMDers,
>> > I am using the 1.9.4a42 build to render videos of trajectories on a
>> > server. There used to be the issues that after a while frames would
>> not be
>> > written anymore. However, atm it seems all frames are written, but
>> the
>> > internal rendering data structures are not cleaned rendering between
>> > frames. This causes my VRAM to get filled during successive renders
>> and
>> > eventually my GPUs kill themselves crashing VMD and sometimes taking
>> some
>> > other stuff with them (window manager etc.). I can understand that
>> having
>> > no free VRAM could result in such issues, but I guess it shouldn't
>> build
>> > up like that in the first place.
>> > VMD:
>> > 1.9.4a42
>> > Nvidia Drivers:
>> > NVIDIA-SMI 440.82 Â Driver Version: 440.82 Â Â Â CUDA Version:
>> 10.2
>> > GPU's:
>> > OptiXRenderer) Creating OptiX window: 672 x 805..
>> > OptiXRenderer) VMD TachyonL-OptiX Interactive Ray Tracer help:
>> > OptiXRenderer) ===============================================
>> > OptiXRenderer) Using 2 devices:
>> > OptiXRenderer) [0] Quadro RTX 8000 Â Â Â CUDA[0], 47.5GB RAM, KTO
>> > OptiXRenderer) [1] Quadro RTX 8000 Â Â Â CUDA[1], 47.5GB RAM
>> > Cheers,
>> > Bart
>>
>> --
>> NIH Center for Macromolecular Modeling and Bioinformatics
>> Beckman Institute for Advanced Science and Technology
>> University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
>> http://www.ks.uiuc.edu/~johns/ Phone: 217-244-3349
>> http://www.ks.uiuc.edu/Research/vmd/
>>
>