Publications

Preparing for exascale: Modeling MPI for Many-core systems using fine-grain queues

Bridges, Patrick G.; Dosanjh, Matthew D.; Grant, Ryan E.; Skjellum, Anthony; Farmer, Shane; Brightwell, Ronald B.

This paper presents a fine-grain queueing model of MPI point-To-point messaging performance for use in the design and analysis of current and future large-scale computing sys-Tems. In particular, the model seeks to capture key perfor-mance behavior of MPI communication on many-core sys-Tems. We demonstrate that this model encompasses key MPI performance characteristics, such as short/long proto-col and offoad/onload protocol tradeos, and demonstrate its use in predicting the potential impact of architectural and software changes for many-core systems on communication performance. In addition, we also discuss the limitations of this model and potential directions for enhancing its fi-delity.