PANDA: Processing-in-MRAM Accelerated De Bruijn Graph based DNA Assembly
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Spurred by widening gap between data processing speed and data communication speed in Von-Neumann computing architectures, some bioinformatic applications have harnessed the computational power of Processing-in-Memory (PIM) platforms. However, the performance of PIMs unavoidably diminishes when dealing with such complex applications seeking bulk bit-wise comparison or addition operations. In this work, we present an efficient Processing-in-MRAM Accelerated De Bruijn Graph based DNA Assembly platform named PANDA based on an optimized and hardware-friendly genome assembly algorithm. PANDA is able to assemble large-scale DNA sequence data-set from all-pair overlaps. We first design PANDA platform that exploits MRAM as a computational memory and converts it to a potent processing unit for genome assembly. PANDA can execute not only efficient bulk bit-wise X(N)OR-based comparison/addition operations heavily required for the genome assembly task but a full-set of 2-/3-input logic operations inside MRAM chip. We then develop a highly parallel and step-by-step hardware-friendly DNA assembly algorithm for PANDA that only requires the developed in-memory logic operations. The platform is then configured with a novel data partitioning and mapping technique that provides local storage and processing to fully utilize the algorithm-level's parallelism. The cross-layer simulation results demonstrate that PANDA reduces the run time and power, respectively, by a factor of 18 and 11 compared with CPU. Besides, speed-ups of up-to 2-4x can be obtained over recent processing-in-MRAM platforms to perform the same task.
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