[Pkg-openmpi-maintainers] OpenMPI 1.5 in Ubuntu Precise

[James Page]

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Hi Sylvestre

On 20/02/12 15:02, Sylvestre Ledru wrote:
> First, thanks for your work on OpenMPI (and, not related to this 
> subject, many thanks to James for his great work on Jenkins).

No problem!

>> Robie Basak and I have been working on evaluating whether Ubuntu 
>> Precise should ship with OpenMPI 1.5.x instead of OpenMPI 1.4.x;
>> this upgrade has been identified of potential importance for
>> future ARM server deployments.
> Do you really have feedbacks for MPI users based on ARM servers ? I
> have the feeling that it is a bit early for that (but I might be 
> wrong).

OpenMPI 1.5 was specifically requested by one of the ARM server
vendors either last UDS or the one before - I'm hoping that we can get
them to test this before we make a decision as to whether we switch.

The main driver was ARM support - however we have OpenMPI 1.4 working
on ARM with the patches that have now landed in 1.5 thanks to Jani
Monoses.

>> 1) The general sanity of this upgrade; is OpenMPI 1.5 really
>> ready for inclusion in anything other than experimental at this
>> point in time? Upstream describe it as a beta/feature release.
> Well, I think upstream is the best judge about their software. If
> they recommends 1.4 for a stable usage, I am not sure we should go
> with 1.5...

I think that you are probably right; 1.5 is not sitting that
comfortably with me at the moment despite the amount of
rebuild/testing we are looking todo.

I guess we do have the option of having a openmpi1.5 package - but not
transitioning the archive limits its use.

>> 2) Some test cases; before we propose this upgrade in Ubuntu we
>> really need to run some tests against openmpi 1.5.  Do you guys
>> have any know good workloads to try against this new version?
> You could try to use packages based on OpenMPI with a test suite. 
> However, for real life hardcore usages, I don't know if we have
> anything in the archive.

OK - thanks for the advice.

Regards

James

- -- 
James Page
Ubuntu Core Developer
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