Implementing Split-Mode Barriers in OpenSHMEM
- Cite this paper as:
- Raymond M.A. (2014) Implementing Split-Mode Barriers in OpenSHMEM. In: Poole S., Hernandez O., Shamis P. (eds) OpenSHMEM and Related Technologies. Experiences, Implementations, and Tools. OpenSHMEM 2014. Lecture Notes in Computer Science, vol 8356. Springer, Cham
Barriers synchronize the state of many processing elements working in parallel. No worker may leave a barrier before all the others have arrived. High performance applications hide latency by keeping a large number of operations in progress asynchronously. Since barriers synchronize all these operations, maximum performance requires that barriers have as little overhead as possible. When some workers arrive at a barrier much later than others, the early arrivers must sit idle waiting for them. Split-mode barriers provide barrier semantics while also allowing the early arrivers to make progress on other tasks. In this paper we describe the process and several challenges in developing split-mode barriers in the OpenSHMEM programming environment.
KeywordsOpenSHMEM barrier split-mode
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