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The Network Locality Project (netloc)

November 18, 2013 at 5:00 am PST

Today’s guest post comes from Dr. Joshua Hursey, an Assistant Professor in the Computer Science Department at the University of Wisconsin, La Crosse.

For a number of years, developers tuning High Performance Computing (HPC) applications and libraries have been harnessing server topology information to significantly optimize performance on servers with increasingly complex memory hierarchies and increasing core counts.  Tools such as the Portable Hardware Locality (hwloc) project provide these applications with abstract, yet detailed, information of the single-server topology.  But that is where the topology analysis often stops — neglecting the one of the largest components of the HPC environment, namely: the network.

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At SC’13 next week? Come say hi!

November 13, 2013 at 2:54 pm PST

sc13-logo_0Are you going to be in Denver at SC’13 next week?

Good!

You need to stop by the Cisco booth (#2535) and say hi to your friendly neighborhood Open MPI developers: Dave Goodell, Reese Faucette, and Jeff Squyres.

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Lawrence Berkeley Labs talk: Cisco Userspace NIC (usNIC)

November 8, 2013 at 11:58 am PST

Here’s the slides from my second talk, which is a deep technical dive into both how the usNIC technology works, and how we use that technology in the BTL plugin that we wrote for Open MPI (which is upstream starting with Open MPI v1.7.3).

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Lawrence Berkeley Labs talk: (Open) MPI, Parallel Computing, Life, the Universe, and Everything

November 8, 2013 at 11:57 am PST

Many thanks to the crew at LBL for hosting my talks yesterday.  There were many insightful questions and comments throughout both talks.

Here’s the slides from my first talk, entitled “(Open) MPI, Parallel Computing, Life, the Universe, and Everything.”  This is a general MPI/Open MPI talk, where I discussed the current state of Open MPI, and then talked in detail about two of Open MPI’s newest features: the MPI-3 “MPI_T” tools interface, and Open MPI’s flexible process affinity system.

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My new favorite Open MPI mpirun feature: tab completion

November 1, 2013 at 5:00 am PST

Today’s guest author is Nathan Hjelm, a Scientist 2 at Los Alamos National Laboratory.

We recently added scripts to support tab completion of mpirun flags and run-time MCA configuration variables to the Open MPI trunk development. The scripts support both bash and zsh and have a number of useful features (depending on the shell).

Can’t remember how to spell that MCA parameter name? Just hit <TAB>.
Can’t remember which transports are available? Just hit <TAB>.
Can’t remember the name of that mpirun CLI option? Just hit <TAB>.

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