Vray Low Cpu Usage On Rendering

#1

Hello guys,
Im turning to you with a problem that is happening to me.

When I try to render my scene (Maya, Vray), there is about 0-10% CPU usage being shown in the Task manager. While I was doing just test renders and tweaking the scene till few days ago, rendering was running properly, but now, when I tryed to push the settings up for final render, it went incredibly slow. So first I was like ,hell, I probably overshoot the settings too much for my computer" so I started to bringing the values back down, but still it took extremly long to render even first prepass, and now I lowered my settings even way under the test settings and it still takes forever. I just cant get it, what happened?

Just for the record, I tryed running a videogame (Operation Flashpoint 2) to check what the CPU usage will be and seems to be working fine (around 40-60%), which makes me conclude the fault is not on the CPUs side.

I attach images below for you to check the rendering process and render settings as well:


image 1 - rendering process, note that it is just a region render and it still took like 30minutes already


image 2 - render settings, those are the lowest I tryed (and the actual ones as well), ideally I would use Adaptive DMC and even higher min/max and resolution

My specs:
Maya 2014 x64 Student, Vray 2.40.01 Win 7 x64
Intel Core i5-4321 2.5GHz (2 cores, 4 threads I think) and 8GB RAM

I will be greatly thankful for any help, I spent 8 months making this scene in my free time and I refuse to give up on it

#2

The task manager is showing that you have used 100% of your ram. This means the renderer needs to constantly wait while the data it needs is swapped in and out. 8GB is not enough to run maya. Try to upgrade to 32GB (24 if you are on a budget). In the meantime, there may be ways of telling the renderer to use less ram by dividing the job into smaller chuncks, but I dont do much rendering these days, so someone else will need to come in here.

David

#3

Have you changed your swap file ?
If the swap is set to none then it will use all of the physical memory it can.

#4

many thanks guys for your answers.

DJX yeah so you ensured me, I had a suspicion its RAM, now I know for sure. However Im working on my laptop and from what I have found, there is a room for upgrading to the 16GB RAM total only, but beter than nothing.

curtis10945 if you mean virtual memory, Im not sure if its good idea, I was advised to not increase it, because it actually make computer even slower, since you only increase size on HDD, which has much slower reading speed than RAM.

I think I will look into that RAM increasing, thanks :thumbsup:

#5

Please post rendering specific questions in the rendering subforum in the future.
Moving this for you.

#6

I’ve had this problem with setting Vray to ‘High’ settings.
You need to leave it at default, and just control it with the Adaptive to something like .08 , or .05 for better settings… (and try turning off Secondary GI) I’m surprised this bug still exists.

I hope that’s correct, as I’m using Redshift3d now, but it works almost the same.