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Publications of Torsten Hoefler
Torsten Hoefler, J. Squyres, Wolfgang Rehm and Andrew Lumsdaine:
| | A Case for Non-Blocking Collective Operations
(Vol 4331/2006, In Frontiers of High Performance Computing and Networking - ISPA'06 Workshops, presented in Sorrento, Italy, pages 155-164, Springer Berlin / Heidelberg, ISBN: 978-3-540-49860-5, Dec. 2006)
AbstractNon-blocking collective operations for MPI have been in discussion for a long time. We want to contribute to this discussion and
to give a rationale for the usage these operations and assess their possible benefits. A LogGP model for the CPU overhead of collective algo-
rithms and a benchmark to measures it are provided and show a large
potential to overlap communication and computation. We show that non-blocking collective operations can provide at least the same benefits as
non-blocking point to point operations already do. Our claim is that actual CPU overhead for non-blocking collective operations depends on the
message size and the communicator size and benefits especially highly
scalable applications with huge communicators. We prove that the share
of the overhead of the overall communication time of current blocking
collective operations gets smaller with bigger communicators and larger
messages. We show that the user level CPU overhead is less than 10% for
MPICH2 and LAM/MPI using TCP/IP communication, which leads us
to the conclusion that, by using non-blocking collective communication,
ideally 90% idle CPU time can be freed for the application.
Documentsdownload article:
| | BibTeX | @inproceedings{hoefler-nbc, author={Torsten Hoefler and J. Squyres and Wolfgang Rehm and Andrew Lumsdaine}, title={{A Case for Non-Blocking Collective Operations}}, year={2006}, month={Dec.}, pages={155-164}, volume={4331/2006}, booktitle={Frontiers of High Performance Computing and Networking - ISPA'06 Workshops}, location={Sorrento, Italy}, publisher={Springer Berlin / Heidelberg}, isbn={978-3-540-49860-5}, source={http://www.unixer.de/~htor/publications/}, } |
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