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2010
Springer

Enabling Concurrent Multithreaded MPI Communication on Multicore Petascale Systems

9 years 4 months ago
Enabling Concurrent Multithreaded MPI Communication on Multicore Petascale Systems
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 highperformance multithreaded communication on the IBM Blue Gene/P. We use a combination of a multichannel-enabled network interface, finegrained 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 capabi...
Gábor Dózsa, Sameer Kumar, Pavan Bal
Added 30 Jan 2011
Updated 30 Jan 2011
Type Journal
Year 2010
Where PVM
Authors Gábor Dózsa, Sameer Kumar, Pavan Balaji, Darius Buntinas, David Goodell, William Gropp, Joe Ratterman, Rajeev Thakur
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