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Partial reconfiguration allows for mapping and executing several tasks on an FPGA during run time. One of the challenging problems in multitasking systems is high amount of communication costs. In this paper, we present two clustering methodologies that temporally cluster real-time tasks for a partially reconfigurable hardware and reduce communication overhead. The first algorithm aims at efficient use of resources by clustering close run-time tasks, and the second one makes the clustering with respect to a trade off between inter-task communication and resource utilization efficiency. The results show significant reduction communication costs.