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Tree-based launch in Open MPI
Jan 19,2015
I've mentioned it before: the run-time systems of MPI implementations are frequently unsung heroes. A lot of blood, sweat, tears, and innovation goes into parallel run time systems, particularly those that can scale to very large systems.  But t...
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Holiday wishes
Dec 24,2014
As usual, in the post-Supercomputing / post-US-Thanksgiving-holiday lull, the work that we have all put off since we started ignoring it to prepare for Supercomputing catches up to us.  Inevitably, it means that my writing here at the blog falls...
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libfabric support of usNIC in Open MPI
Nov 17,2014
I've previously written about libfabric.  Here's some highlights: libfabric is a set of next-generation, community-driven, ultra-low latency networking APIs The APIs are not tied to any particular networking hardware model Cisco is actively ...
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usNIC support for the Intel MPI Library
Nov 17,2014
Cisco is pleased to announce the intention to support the Intel MPI Library? with usNIC on the UCS server and Nexus switches product lines over the ultra low latency Ethernet and routable IP transports, at both 10GE and 40GE speeds. usNIC will be ena...
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Top 5 Reasons the HPC Community Should Care About libfabric
Nov 12,2014
I've mentioned libfabric on this blog a few times: it's a set of next-generation APIs that allow direct access to networking hardware (e.g., high-speed / low latency NICs) from Linux userspace (kernel access is in the works). To give you a little per...
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"Using Advanced MPI" book (i.e., MPI-3 for the rest of us)
Nov 09,2014
I'm stealing this text directly from Torsten Hoefler's blog, because I think it's directly relevant to many of this blog's readers: Our book on "Using Advanced MPI" will appear in about a month - now it's the time to pre-order on Amazon at a r...
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Supercomputing is upon us!
Oct 31,2014
It's that time of year again - we're at about T-2.5 weeks to the Supercomputing conference and trade show;  SC'14 is in New Orleans, November 16-21. Are you going to get some tasty gumbo and supercharged computing power?   If so, come ...
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The "vader" shared memory transport in Open MPI: Now featuring 3 flavors of zero copy!
Oct 29,2014
Today's blog post is by Nathan Hjelm, a Research Scientist at Los Alamos National Laboratory, and a core developer on the Open MPI project. The latest version of the "vader" shared memory Byte Transport Layer (BTL) in the upcoming Open...
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HPC schedulers: What is a "slot"?
Oct 22,2014
Today's guest post comes from Ralph Castain, a principle engineer at Intel.  The bulk of this post is an email he sent explaining the concept of a "slot" in typical HPC schedulers. This is a little departure from the normal fare on this blog, bu...
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usNIC provider contributed to libfabric
Oct 20,2014
Today's guest post is by Reese Faucette, one of my fellow usNIC team members here at Cisco. I'm pleased to announce that this past Friday, Cisco contributed a usNIC-based provider to libfabric, the new API in the works from OpenFabrics Interfaces Wor...
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MPI-3.1
Oct 07,2014
As you probably already know, the MPI-3.0 document was published in September of 2012. We even got a new logo for MPI-3.  Woo hoo! The MPI Forum has been busy working on both errata to MPI-3.0 (which will be collated and published as "MPI-3.1") ...
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Overlap of communication and computation (part 2)
Sep 19,2014
In part 1 of this series, I discussed various peer-wise technologies and techniques that MPI implementations typically use for communication / computation overlap. MPI-3.0, published in 2012, forced a change in the overlap game. Specifically: most pr...
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