If you use many GPUs in DR nodes you might find that the network develops a bottleneck at some point due to the GPUs producing data very fast. How can I reduce network bandwidth when using GPU in a heavy DR setup? V-Ray displays a warning if the GPU used for monitoring is participating in the rendering process. Turn it on in the GPU Performance Tab in the Render Setup window. The Low GPU thread priority parameter was designed to help with this issue.You can check the difference in render speed (GPU utilization) in the VFB Stats panel and thus find the optimal settings for your system. However, this might reduce rendering speed. This breaks up the data passed to the GPU into smaller chunks so that user interface requests can be processed faster. If you are rendering interactively, you can try reducing the value for IPR Rays per pixel and/or IPR ray bundle size in the GPU Performance tab (note that this optimization does not apply to high-end GPUs). If you have only one GPU on your system, you can try reducing the value for Rays per pixel and/or Rays bundle size in the GPU Performance tab in the Render Setup dialog.If you have multiple GPUs, you can speed up screen refresh time by removing the GPU used for monitor/viewport redraw from the devices that GPU uses for rendering.
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