Brute Force is always used as the primary GI engine. Light Cache can be used as secondary GI engine with V-Ray GPU for both production rendering and IPR. Production rendering allows you to render animations, and V-Ray calculates and uses Light Cache for GPU GI calculations if it has been set as secondary GI engine. The main differences are that the IPR mode is interactive and the Production Rendering Mode is not. You can set it by selecting V-Ray GPU from the Renderer dropdown when the Target drop-down is set to Production Rendering Mode from the top of the Render Setup window, or also by adjusting the selected renderer to V-Ray GPU in the Production setting found in the Assign Renderer rollout at the bottom of the Common tab. How do I setup V-Ray GPU as my production renderer? What are the differences between IPR and Production mode? V-Ray GPU also reports how much memory it uses for textures/geometry/Light Cache/etc. You can use free 3rd party tools like MSI Afterburner and EVGA Precision to monitor both GPU memory usage and utilization. How do I check the memory usage on the GPU and how do I reduce the GPU memory needed for my scene? To increase the size of the workload chunks that are being given to the DR nodes and help reduce the communication between the client and the servers, increase the Ray bundle size and Rays per pixel parameters in the GPU Performance Tab in the Render Setup dialog.
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.
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 have only one GPU on your system, you could try reducing the value for Rays per pixel and/or Ray 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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