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• W3002103145 abstract "High interconnect bandwidth is crucial for achieving better performance in many-core GPGPU architectures that execute highly data parallel applications. The parallel warps of threads running on shader cores generate a high volume of read requests to the main memory due to the limited size of data caches at the shader cores. This leads to a scenarios with rapid arrival of an even larger volume of reply data from the DRAM, which creates a bottleneck at memory controllers (MCs) that send reply packets back to the requesting cores over the network-on-chip (NoC). Coping with such high volumes of data requires intelligent memory scheduling and innovative NoC architectures. To mitigate memory bottlenecks in GPGPUs, we first propose a novel approximate memory controller architecture (AMC) that reduces the DRAM latency by opportunistically exploiting row buffer locality and bank level parallelism in memory request scheduling, and leverages approximability of the reply data from DRAM, to reduce the number of reply packets injected into the NoC. To further realize high throughput and low energy communication in GPGPUs, we propose a low power, approximate NoC architecture (Dapper) that increases the utilization of the available network bandwidth by using single cycle overlay circuits for the reply traffic between MCs and shader cores. Experimental results show that Dapper and AMC together increase NoC throughput by up to 21 percent; and reduce NoC latency by up to 45.5 percent and energy consumed by the NoC and MC by up to 38.3 percent, with minimal impact on output accuracy, compared to state-of-the-art approximate NoC/MC architectures." @default.
• W3002103145 created "2020-01-30" @default.
• W3002103145 creator A5014215787 @default.
• W3002103145 creator A5018382547 @default.
• W3002103145 date "2020-05-01" @default.
• W3002103145 modified "2023-09-23" @default.
• W3002103145 title "Approximate NoC and Memory Controller Architectures for GPGPU Accelerators" @default.
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• W3002103145 doi "https://doi.org/10.1109/tpds.2019.2958344" @default.
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