Collaborative Research: Extending One-Sided Communication MPI Programming Model for Next -Generation Ultra-Scale HEC

协作研究：扩展下一代超大规模 HEC 的单侧通信 MPI 编程模型

• 批准号: 0833139
• 负责人: Karl Schulz
• 金额: $ 19.9万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0833139&HistoricalAwards=false
• 关键词: Collaborative; Research; Extending; Sided; Communication

Most of the traditional HEC applications and current petascale applications are written using the Message Passing Interface (MPI) programming model. The MPI-1 standard provides communication semantics for two-sided operations. The MPI-2 standard added new one-sided communication semantics. However, most of the current candidate petascale applications continue to use the MPI-1 semantics.These applications find the available MPI one-sided communication semantics and their implementations in existing MPI-2 libraries very restrictive to exploit performance, scalability and fault-tolerance. The investigators, involving computer scientists from Ohio State University (OSU) and computational scientists from Texas Advanced Computing Center (TACC) and San Diego Supercomputer Center (SDSC), will study and analyze the current restrictions in the MPI one-sided communication semantics, their implementations and usages. Novel solutions will be proposed to alleviate these restrictions so that the next generation ultra-scale systems and applications can be scaled to hundreds of thousands of cores.The investigators will specifically address the following challenges: 1) What are the limitations of using MPI one-sided operations in petascale applications? 2) What extensions are possible to the current MPI one-sided operations to alleviate such limitations? 3) How to design and implement these extensions in an MPI library for emerging ultra-scale HEC systems? 4) How to redesign petascale applications to take advantage of proposed one-sided extensions and their implementations? and 5) What kind of benefits (performance, scalability and fault tolerance) can be achieved by the proposed extensions for petascale applications on the next generation ultra-scale systems? The research will be driven by a set of petascale applications (ENZO, AWM-Olsen, PSDNS and MPCUGLES) from established NSF computational science researchers running large scale simulations on the TACC Ranger and other NSF HEC systems.

大多数传统的HEC应用程序和当前的Petascale应用程序都是使用消息传递接口（MPI）编程模型编写的。 MPI-1标准为双向操作提供通信语义。 MPI-2标准添加了新的单方面通信语义。 但是，当前的大多数候选佩斯卡尔应用程序继续使用MPI-1语义。这些应用程序发现可用的MPI单方面通信语义及其在现有MPI-2库中的实现非常限制，以利用性能，可伸缩性和耐受性。涉及俄亥俄州立大学（OSU）的计算机科学家以及得克萨斯州高级计算中心（TACC）和圣地亚哥超级计算机中心（SDSC）的计算机科学家的研究人员将研究和分析MPI单方面通信语义的当前限制，其实施和用途。将提出新颖的解决方案来暗示这些限制，以便下一代超规模的系统和应用可以缩放到数十万个核心。研究人员将特别应对以下挑战：1）使用MPI单方面操作在Petascale应用中使用什么限制？ 2）当前的MPI单方面操作可减轻此类限制，可以进行哪些扩展？ 3）如何在MPI库中设计和实施这些扩展，以用于新兴的超规模HEC系统？ 4）如何重新设计Petascale应用程序以利用拟议的单方面扩展及其实施？ 5）通过拟议的佩斯卡莱应用程序在下一代超规模系统上应用的扩展，可以实现什么样的好处（性能，可伸缩性和容忍度）？ 这项研究将由一系列佩斯卡尔应用程序（Enzo，AWM-Olsen，PSDN和MPCugles）驱动，该应用程序已建立的NSF计算科学研究人员在TACC Ranger和其他NSF HEC系统上进行了大规模模拟。