The OpenSHMEM community is actively exploring threading support extensions to the OpenSHMEM communication interfaces. Among the motivations for these extensions are the optimization of on-node data sharing and reduction of memory pressure, both of which are problems that hybrid programming has successfully addressed in other programming models. We observe that OpenSHMEM already supports inter-process shared memory for processes within the same node. In this work, we assess the viability of this existing API to address the on-node optimization problem, which is of growing importance. We identify multiple on-node optimizations that are already possible with the existing interface, propose a layered library that extends the functionality of these interfaces, and measure performance improvement when using these techniques.
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