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Publications of Torsten Hoefler
Torsten Hoefler, Christian Siebert and Andrew Lumsdaine:
| | | Scalable Communication Protocols for Dynamic Sparse Data Exchange
(In Proceedings of the 2010 ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming (PPoPP'10), presented in Bangalore, India, pages 159--168, ACM, ISBN: 978-1-60558-708-0, Jan. 2010)
AbstractMany large-scale parallel programs follow a bulk synchronous parallel
(BSP) structure with distinct computation and communication phases.
Although the communication phase in such programs may involve all (or
large numbers) of the participating processes, the actual communication
operations are usually sparse in nature. As a result, communication
phases are typically expressed explicitly using point-to-point
communication operations or collective operations. We define the dynamic
sparse data-exchange (DSDE) problem and derive bounds in the well
known LogGP model. While current approaches work well with static
applications, they run into limitations as modern applications grow in
scale, and as the problems that are being solved become increasingly
irregular and dynamic. To enable the compact and efficient expression
of the communication phase, we develop suitable sparse communication
protocols for irregular applications at large scale.
We discuss different irregular applications and show the sparsity in the
communication for real-world input data. We discuss the time and memory
complexity of commonly used protocols for the DSDE problem and develop
NBX---a novel fast algorithm with constant memory overhead
for solving it. Algorithm NBX improves the runtime of a
sparse data-exchange among 8,192 processors on BlueGene/P by a factor of
5.6. In an application study, we show improvements of up to a factor of
28.9 for a parallel breadth first search on 8,192 BlueGene/P processors.
ACM Stats
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| | | BibTeX | @inproceedings{hoefler-dsde,
author={Torsten Hoefler and Christian Siebert and Andrew Lumsdaine},
title={{Scalable Communication Protocols for Dynamic Sparse Data Exchange}},
year={2010},
month={Jan.},
pages={159--168},
booktitle={Proceedings of the 2010 ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming (PPoPP'10)},
location={Bangalore, India},
publisher={ACM},
isbn={978-1-60558-708-0},
source={http://www.unixer.de/~htor/publications/},
} |
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