OTOY Forums

Hello there,

I am rendering a few scenes using PMC and it looks like it doesn't take advantage of both cards. More like it bounces back and forth between one and the other. Or at least that's what the gpu monitor and gpu logs show.
I wonder if it's just a misrepresentation or it's actually what's happening.
My c4d is up to date and so are my nvidia drivers. I am rendering using gtx 980Ti and gtx 1080. Octane version is 3.05.3

Thanks in advance,
Alessio

Hi Alessio,
what value of MaxSampling/sec. do you have with one and two cards?
ciao beppe

bepeg4d wrote:Hi Alessio,
what value of MaxSampling/sec. do you have with one and two cards?
ciao beppe

Ciao Beppe.
The Ms/sec is around 2.2 with one or two cards.
Thank you.

If you experience this, blending the results into the film buffer is the bottleneck. The blending is done on the CPU and if you have too many render passes or the CPU is too slow, the GPUs are producing too many samples too fast and thus have too wait for the CPU to catch up blending.

We are trying to address this problem in the future, but an improvement depends on some work that isn't finished yet.