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IEEE/ICACT20230047 Slide.05        [Big Slide]       [YouTube]	Oral Presentation
	To use multiple GPUs for parallel rendering of path tracing, it is necessary to reasonably divide the rendering tasks to each GPU. Thus we divide the image into a number of work areas according to the number of GPUs on a single-node server, and distribute them to each GPU to perform their own rendering tasks. Since the rendering tasks of the tiles cannot be known in advance, at the beginning of path-tracing, each GPU is responsible for the tiles of equal size for simplicity. The workload division mode is shown in Figure 1. For a cluster composed of 2 GPUs, the picture is divided into two equal upper and lower tiles, and the same for 3 and 4 GPUs.

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