Abstract
Emerging memory technologies offer the prospect of large capacity, high bandwidth, and a range of access latencies ranging from DRAM-like to SSD-like. In this paper, we evaluate the performance of parallel applications on CPUs whose main memories sweep a wide range of latencies within a bandwidth cap. We use an FPGA emulator, the logic in memory emulator (LiME) to accelerate evaluation. The LiME framework uses a multiprocessor system on chip (MPSoC) combining multicore CPU, integrated memory controller, and FPGA fabric, and enables emulation orders of magnitude faster than software simulation. Our paper highlights the performance impact of higher latency on concurrent applications and identifies conditions under which future high latency memories can effectively be used as main memory.
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