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Publications of Torsten Hoefler
Torsten Hoefler and Andrew Lumsdaine:
| | | Optimizing non-blocking Collective Operations for InfiniBand
(In Proceedings of the 22nd IEEE International Parallel & Distributed Processing Symposium, CAC'08 Workshop, presented in Miami, FL, ISSN: 1530-2075, ISBN: 978-1-4244-1694-3, Apr. 2008)
AbstractNon-blocking collective operations have recently
been shown to be a promising complementary approach for overlapping communication and computation in parallel applications.
However, in order to maximize the performance and usability of
these operations it is important that they progress concurrently
with the application without introducing CPU overhead and
without requiring explicit user intervention. While studying non-blocking collective operations in the context of our portable
library (libNBC), we found that most MPI implementations do
not sufficienctly support overlap over the InfiniBand network.
To address this issue, we developed a low-level communication
layer for libNBC based on the Open Fabrics InfiniBand verbs
API. With this layer we are able to achieve high degrees of
overlap without the need to explicitly progress the communication
operations. We show that the communication overhead of parallel
application kernels can be reduced up to 92% while not requiring
user intervention to make progress.
Documentsdownload article: 
download slides:
| | | BibTeX | @inproceedings{hoefler-libnbc-of,
author={Torsten Hoefler and Andrew Lumsdaine},
title={{Optimizing non-blocking Collective Operations for InfiniBand}},
year={2008},
month={Apr.},
booktitle={Proceedings of the 22nd IEEE International Parallel \& Distributed Processing Symposium, CAC'08 Workshop},
location={Miami, FL},
issn={1530-2075},
isbn={978-1-4244-1694-3},
source={http://www.unixer.de/~htor/publications/},
} |
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