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2015 International Conference on Parallel Architecture and Compilation (PACT) (2015)
San Francisco, CA, USA
Oct. 18, 2015 to Oct. 21, 2015
ISSN: 1089-795X
ISBN: 978-1-4673-9524-3
pp: 496-497
General purpose graphics processing units (GPUs) have become a promising solution to process massive data by taking advantages of multithreading. Thanks to thread-level parallelism, GPU-accelerated applications improve the overall system performance by up to 40 times [1], [2], compared to CPU-only architecture. However, data-intensive GPU applications often generate large amount of irregular data accesses, which results in cache thrashing and contention problems [11], [12]. The cache thrashing in turn can introduce a large number of off-chip memory accesses, which not only wastes tremendous energy to move data around on-chip cache and off-chip global memory, but also significantly limits system performance due to many stalled load/store instructions [18], [21].In this work, we redesign the shared last-level cache (LLC) of GPU devices by introducing non-volatile memory (NVM), which can address the cache thrashing issues with low energy consumption. Specifically, we investigate two architectural approaches, one of each employs a 2D planar resistive random-access memory (RRAM) as our baseline NVM-cache and a 3D-stacked RRAM technology [14], [15]. Our baseline NVM-cache replaces the SRAM-based L2 cache with RRAM of similar area size; a memory die consists of eight subarrays, one of which a small fraction of memristor island by constructing 512x512 matrix [13]. Since the feature size of SRAM is around 125 F2 [19] (while that of RRAM around 4 F2 [20]), it can offer around 30x bigger storage capacity than the SRAM-based cache. To make our baseline NVM-cache denser, we proposed 3D-stacked NVM-cache, which piles up four memory layers, and each of them has a single pre-decode logic [16], [17].
Nonvolatile memory, Graphics processing units, Random access memory, Computer architecture, Integrated circuit modeling, Energy efficiency, Instruction sets

J. Zhang, D. Donofrio, J. Shalf and M. Jung, "Integrating 3D Resistive Memory Cache into GPGPU for Energy-Efficient Data Processing," 2015 International Conference on Parallel Architecture and Compilation (PACT), San Francisco, CA, USA, 2015, pp. 496-497.
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