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SMARTMAP: Operating system support for efficient data sharing among processes on a multi-core processor

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3 Author(s)
Brightwell, R. ; Scable Syst. Software Dept., Sandia Nat. Labs., Albuquerque, NM, USA ; Pedretti, K. ; Hudson, T.

This paper describes SMARTMAP, an operating system technique that implements fixed offset virtual memory addressing. SMARTMAP allows the application processes on a multi-core processor to directly access each other's memory without the overhead of kernel involvement. When used to implement MPI, SMARTMAP eliminates all extraneous memory-to-memory copies imposed by UNIX-based shared memory strategies. In addition, SMARTMAP can easily support operations that UNIX-based shared memory cannot, such as direct, in-place MPI reduction operations and one-sided get/put operations. We have implemented SMARTMAP in the Catamount lightweight kernel for the Cray XT and modified MPI and Cray SHMEM libraries to use it. Micro-benchmark performance results show that SMARTMAP allows for significant improvements in latency, bandwidth, and small message rate on a quad-core processor.

Published in:

High Performance Computing, Networking, Storage and Analysis, 2008. SC 2008. International Conference for

Date of Conference:

15-21 Nov. 2008