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Published in:
2010 | OriginalPaper | Chapter
Enabling Concurrent Multithreaded MPI Communication on Multicore Petascale Systems
Authors : Gábor Dózsa, Sameer Kumar, Pavan Balaji, Darius Buntinas, David Goodell, William Gropp, Joe Ratterman, Rajeev Thakur
Published in: Recent Advances in the Message Passing Interface
Publisher: Springer Berlin Heidelberg
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With the ever-increasing numbers of cores per node on HPC systems, applications are increasingly using threads to exploit the shared memory within a node, combined with MPI across nodes. Achieving high performance when a large number of concurrent threads make MPI calls is a challenging task for an MPI implementation. We describe the design and implementation of our solution in MPICH2 to achieve high-performance multithreaded communication on the IBM Blue Gene/P. We use a combination of a multichannel-enabled network interface, fine-grained locks, lock-free atomic operations, and specially designed queues to provide a high degree of concurrent access while still maintaining MPI’s message-ordering semantics. We present performance results that demonstrate that our new design improves the multithreaded message rate by a factor of 3.6 compared with the existing implementation on the BG/P. Our solutions are also applicable to other high-end systems that have parallel network access capabilities.