Time and Location: 12/4/2019, Wed., 10:30 a.m., CS Conference Room 206

 

Speaker: Mr. Xi Wang

 

Title: RAE: Remote Atomic Extension for Scalable High Performance Computing

 

Abstract: With the exponential growth of data in many science and engineering domains, faster and more efficient inter-node communications and data transfer become emergent. The frequent global data operations, such as atomics, can be a performance bottleneck for the large scale HPC systems. However, conventional local atomic design cannot be expanded to guarantee the global atomicity and the software-based remote atomic methodologies induce large amount of redundant overhead. In this talk, we introduce a novel remote atomic extension (RAE) to manage the inter-node atomic accesses with ISA-level instructions and associated microarchitecture support. The RAE is designed and implemented on top of the extended base global address space (xBGAS)  extension of the RISC-V ISA. In this talk, we will demonstrate the motivations of the remote atomic operations and introduce the associated ISA and microarchitecture design as an addition to the previous xBGAS extension. We also present the implementations and evaluations to justify the impacts of RAE on the system performance and demonstrate the insights of this work.