Thu 21 Jun 2018 11:25 - 11:50 at Grand Ballroom AB - Multicore and More Chair(s): Yannis Smaragdakis

Going beyond a certain number of cores in modern architectures requires an on-chip network more scalable than conventional buses. However, employing an on-chip network in a manycore system (to improve scalability) makes the latencies of the data accesses issued by a core non-uniform. This non-uniformity can play a significant role in shaping the overall application performance. This work presents a novel compiler strategy which involves exposing architecture information to the compiler to enable an optimized computation-to-core mapping. Specifically, we propose a compiler-guided scheme that takes into account the relative positions of (and distances between) cores, last-level caches (LLCs) and memory controllers (MCs) in a manycore system, and generates a mapping of computations to cores with the goal of minimizing the on-chip network traffic. The experimental data collected using a set of 21 multi-threaded applications reveal that, on an average, our approach reduces the on-chip network latency in a 6x6 manycore system by 38.4% in the case of private LLCs, and 43.8% in the case of shared LLCs. These improvements translate to the corresponding execution time improvements of 10.9% and 12.7% for the private LLC and shared LLC based systems, respectively.

Thu 21 Jun
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11:00 - 12:15: Multicore and MorePLDI Research Papers at Grand Ballroom AB
Chair(s): Yannis SmaragdakisUniversity of Athens
11:00 - 11:25
Talk
PLDI Research Papers
David KoeplingerStanford University, USA, Matthew FeldmanStanford University, USA, Raghu PrabhakarStanford University, USA, Yaqi ZhangStanford University, USA, Stefan HadjisStanford University, USA, Ruben FiszelEPFL, Switzerland, Tian ZhaoStanford University, Luigi NardiStanford University, Ardavan PedramStanford University, USA, Christos KozyrakisStanford University, USA, Kunle OlukotunStanford University
Media Attached
11:25 - 11:50
Talk
PLDI Research Papers
Orhan KislalPennsylvania State University, USA, Jagadish KotraPennsylvania State University, USA, Xulong TangPenn State, Mahmut Taylan KandemirUniversity of Pennsylvania, Myoungsoo JungYonsei University, South Korea
Media Attached
11:50 - 12:15
Talk
PLDI Research Papers
Kim-Anh TranUppsala University, Sweden, Alexandra JimboreanUppsala University, Trevor E. CarlsonNational University of Singapore, Konstantinos KoukosUppsala University, Sweden, Magnus SjälanderNorwegian University of Science and Technology (NTNU), Stefanos KaxirasUppsala University, Sweden
Media Attached