| Summary: | With the development of high performance computing, Field Programmable Gate Arrays (FPGAs) are widely used for task acceleration. Partial reconfigurable technology provides the possibility of multi-task concurrent computation on FPGAs. However, it is still difficult to achieve high performance multi-task acceleration in multi-FPGA systems due to the resource contention in limited hardware resources and reconfiguration overhead. In this paper, we propose a two-stage task scheduling approach in multi-FPGA systems to optimize task execution efficiency. At the first scheduling stage, we select an appropriate computing unit for each task considering the subtask similarity and resource requirement similarity to reduce the possibility of reconfiguration and resource contention. At the second scheduling stage, we coordinate the subtask scheduling and placement to make full use of the hardware resources of FPGAs and improve the acceleration performance. Experiments show that our two-stage scheduling approach significantly reduces the tasks makespan and improves the utilization of resources compared with other traditional methods.
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