ACM Transactions on Embedded Computing Systems (TECS) - Special Issue on Design Challenges for Many-Core Processors, Special Section on ESTIMedia'13 and Regular Papers
Loop Transforming for Reducing Data Alignment on Multi-Core SIMD Processors
Journal of Signal Processing Systems
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In this paper, we focus on solving the problem of removing inter-core communication overhead for streaming applications on chip multiprocessors. The objective is to totally remove inter-core communication overhead while minimizing the overall memory usage. By totally removing inter-core communication overhead, a shorter period can be applied and system throughput can be improved. Our basic idea is to let tasks with intra-period data dependencies transform to inter-period data dependencies so as to overlap the execution of computation and inter-core communication tasks. To solve the problem, we first perform analysis and obtain the bounds of the times needed to reschedule each task. Then we formulate the scheduling problem as an integer linear programming (ILP) model and obtain an optimal schedule. We perform simulations on a set of benchmarks from both real-life streaming applications and synthetic task graphs. The simulation results show that the proposed approach can achieve significant reduction in schedule length and improve the memory usage compared with the previous work.