NDLI: WarpPool: sharing requests with inter-warp coalescing for throughput processors

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WarpPool: sharing requests with inter-warp coalescing for throughput processors

Content Provider	ACM Digital Library
Author	Dreslinski, Ron Wollman, Mick Mudge, Trevor Kloosterman, John Sethia, Ankit Mahlke, Scott Beaumont, Jonathan
Abstract	Although graphics processing units (GPUs) are capable of high compute throughput, their memory systems need to supply the arithmetic pipelines with data at a sufficient rate to avoid stalls. For benchmarks that have divergent access patterns or cause the L1 cache to run out of resources, the link between the GPU's load/store unit and the L1 cache becomes a bottleneck in the memory system, leading to low utilization of compute resources. While current GPU memory systems are able to coalesce requests between threads in the same warp, we identify a form of spatial locality between threads in multiple warps. We use this locality, which is overlooked in current systems, to merge requests being sent to the L1 cache. This relieves the bottleneck between the load/store unit and the cache, and provides an opportunity to prioritize requests to minimize cache thrashing. Our implementation, WarpPool, yields a 38% speedup on memory throughput-limited kernels by increasing the throughput to the L1 by 8% and the reducing the number of L1 misses by 23%. We also demonstrate that WarpPool can improve GPU programmability by achieving high performance without the need to optimize workloads' memory access patterns. A Verilog implementation including place-and route shows WarpPool requires 1.0% added GPU area and 0.8% added power.
Starting Page	433
Ending Page	444
Page Count	12
File Format	PDF
ISBN	9781450340342
DOI	10.1145/2830772.2830830
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-12-05
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Memory coalescing Memory divergence Gpgpu
Content Type	Text
Resource Type	Article

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