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Open MPI 1.7.5 released

March 21, 2014 at 6:46 am PST

After a metric ton of work by the entire community, Open MPI has released version 1.7.5.

Among the zillions of minor updates and new enhancements are two major new features:

  1. MPI-3.0 conformance
  2. OpenSHMEM support (Linux only)

See this post on the Open MPI announcement list for more details.

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HPC in L3

March 10, 2014 at 11:30 am PST

As an HPC old-timer, I’m used to thinking of HPC networks as large layer-2 (“L2″) subnets.  All HPC traffic (e.g., MPI traffic) is therefore designed to stay within a single L2 subnet.

The next layer up — L3 — is the “networking” layer in the OSI network model; it adds more abstractions than are available in L2.  For example, IP switching and routing occurs at L3.  Indeed, L3-based networks can be comprised of multiple subnets.

I’ve come to appreciate that, especially with modern high-speed networking gear, there is no reason for limiting HPC networks to L2.

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What’s Next for MPI?

February 18, 2014 at 3:40 am PST

MPI-3 has been out for over a year and a half.  MPICH supports all of the mandatory MPI-3 behavior and some of its optional semantics.  Open MPI supports all of MPI-3 except the new one-sided semantics.  New functionality is becoming mature in both, and that maturity is trickling down to the implementations that are derived from those two.

So what’s next?  Are we done?

Far from it.

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Open MPI 1.7.4 released!

February 7, 2014 at 6:36 am PST

Open MPI logoIt took us longer than we intended, but we finally released Open MPI v1.7.4.  

Woo hoo!  (we got nice coverage from El Reg, too)

This is a monster release; it represents hundreds (thousands? millions?) of person-hours of work.  Consider this a ginormous “thank you!” to the entire Open MPI community! Special thanks goes to Paul Hargrove of Lawrence Berkeley Labs for his hero efforts in regression testing throughout December and January.

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More Network Locality (Netloc) progress

January 31, 2014 at 9:11 am PST

We announced the Network locality project at SC’13, and generated a LOT of interest (far more than I even anticipated!).  As a refresher, here’s a link to a a blog entry we wrote about Netloc back in November.

There is still much work to be done; we’re actively continuing work in multiple areas:
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