Abstract
SHMEM has a long history as a parallel programming model. It is extensively used since 1993, starting from Cray T3D systems. For the past two decades SHMEM library implementation in Cray systems evolved through different generations. The current generation of the SHMEM implementation for Cray XC and XK systems is called Cray SHMEM. It is a proprietary SHMEM implementation from Cray Inc. In this work, we provide an in-depth analysis of need for a new SHMEM implementation and then introduce the next evolution of Cray SHMEM implementation for current and future generation Cray systems. We call this new implementation Cray OpenSHMEMX. We provide brief design overview, along with a review of functional and performance differences in Cray OpenSHMEMX comparing against the existing Cray SHMEM implementation.
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Notes
- 1.
Though SMAT layer supports different communication layers, we use DMAPP and XPMEM in this work as others are experimental and not available in the current released Cray OpenSHMEMX version 8.0.1.
- 2.
Number of Processing Elements (PEs) Per Node.
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Acknowledgment and Disclaimer
The authors would like to thank all the members of Cray Message Passing Toolkit for their involvement in the design and implementation of the Cray OpenSHMEMX software stack. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of associated organizations.
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Namashivayam, N., Cernohous, B., Pou, D., Pagel, M. (2019). Introducing Cray OpenSHMEMX - A Modular Multi-communication Layer OpenSHMEM Implementation. In: Pophale, S., Imam, N., Aderholdt, F., Gorentla Venkata, M. (eds) OpenSHMEM and Related Technologies. OpenSHMEM in the Era of Extreme Heterogeneity. OpenSHMEM 2018. Lecture Notes in Computer Science(), vol 11283. Springer, Cham. https://doi.org/10.1007/978-3-030-04918-8_3
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