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New Open MPI stable series launched: v1.8

Open MPI logoThe Open MPI project released version v1.8 last week.  This is a major release that heralds the beginning of a new production-ready series, full MPI-3.0 support, and a new OpenSHMEM implementation.

Open MPI is developed in a tick-tock fashion:

  • Odd-numbered series are focused on feature development and expansion
  • Even-numbered series are focused on stability and production usage

The even-numbered v1.8.x series therefore represents a new production-ready series that effectively deprecates the prior production-ready series (v1.6.x).

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Belated April Fool’s blog post

MPIoEI was on vacation last week, and had a nice April Fool’s blog post queued up to be posted at 8am US Eastern time on 1 April 2014.

It should have appeared whilst I was relaxing on a beach… but due to a bug in our WordPress installation, it didn’t.  And I didn’t find out about the error until after I returned from vacation (long after April 1st).

Sad panda.

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Open MPI 1.7.5 released

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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Open MPI 1.7.4 released!

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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Open MPI: Binding to core by default

After years of discussion, the upcoming release of Open MPI 1.7.4 will change how processes are laid out (“mapped”) and bound by default.  Here’s the specifics:

  • If the number of processes is <= 2, processes will be mapped by core
  • If the number of processes is > 2, processes will be mapped by socket
  • Processes will be bound to core
  • MPI_COMM_WORLD ranks will be assigned by slot

These are all the default values — they, of course, can be changed by the user via mpirun CLI options, environment variables, etc.

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