Depends on what you think you might want, and how tolerant you and your users are about bugs.
The 1.6 series is clearly more mature and stable. It has nearly all the MPI-2 stuff now, but no MPI-3.
If you think there is something in MPI-3 you might want, then the 1.7 series could be the way to go - though you'll have to suffer thru its growing pains. Possible future "features" include more thread safety as well [though that may be delayed until the 1.9 series (depends on availability of people's time)], new mappers, new collectives, etc. Performance at the application level could be improved as a result.
Personally, even though I'm one of the 1.7 release managers, I'm a little leery of recommending it for a production installation until we get further down the road. You might consider installing 1.6 as your "base" release, and then offering 1.7 to those who want to explore its new features?
On May 1, 2013, at 8:53 PM, Christopher Samuel <samuel_at_[hidden]> wrote:
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> Hi folks,
> We're about to bring up a new cluster (IBM iDataplex with SandyBridge
> CPUs including 10 nodes with two Intel Xeon Phi cards) and I'm at the
> stage where we need to pick an OMPI release to put on.
> Given that this system is at the start of its life whatever we pick
> now is likely to be baked in for the next 4 years or so (with OMPI
> point release updates of course) and so I'm thinking that I should be
> going with the 1.7.x release rather than the 1.6.x one.
> For comparison the Nehalem iDP this is going in next to is still at
> 1.4.x, it wouldn't be worth the effort to take it to a later release
> given it has probably only another 18 months of life left.
> However, not having been able to keep up with this list for some time
> I'd like to throw myself on your tender mercies for advice for whether
> that's a good plan or not!
> Thoughts please?
> All the best,
> - --
> Christopher Samuel Senior Systems Administrator
> VLSCI - Victorian Life Sciences Computation Initiative
> Email: samuel_at_[hidden] Phone: +61 (0)3 903 55545
> http://www.vlsci.org.au/ http://twitter.com/vlsci
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