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Subject: Re: [OMPI users] Upgrade from Open MPI 1.2 to 1.3
From: Ralph Castain (rhc_at_[hidden])
Date: 2009-04-27 14:23:03


It's hard for me to believe that would work as there are fundamental
differences in the MPI-to-RTE interactions between those releases. If it
does, it could be a fluke - I personally would not trust it.

Ralph

On Mon, Apr 27, 2009 at 12:04 PM, Serge <skhan_at_[hidden]> wrote:

> Hi Jeff,
>
> > That being said, we have fixed this issue and expect to support binary
> > compatibility between Open MPI releases starting with v1.3.2 (v1.3.1
>
> As far as I can tell from reading the release notes for v1.3.2, the binary
> compatibility has not been announced yet. It was rather a bug fix release.
> Is it correct? Does it mean that the compatibility feature is pushed to
> later releases, v1.3.3, 1.3.4?
>
> In my original message (see below) I was looking for advice as for a
> seamless transition from v1.2.x to v1.3.x in a shared multi-user
> environment.
>
> Interestingly enough, recently I noticed that although it's impossible to
> run an application compiled with v1.2.x under v1.3.x, the opposite does
> actually work. An application compiled with v1.3.x runs using Open MPI
> v1.2.x. Specifically, I tested an application compiled with v1.3.0 and
> v1.3.2, running under Open MPI v1.2.7.
>
> This gives me a perfect opportunity to recompile all the parallel
> applications with v1.3.x, transparently to users; and then switch the
> default Open MPI library from v1.2.7 to v1.3.x, when all the apps have been
> rebuilt.
>
> The problem is that I am not 100% sure in this approach, even having some
> successful tests done.
>
> Is it safe to run an application built with 1.3.x under 1.2.x? Does it make
> sense to you?
>
> = Serge
>
>
> Jeff Squyres wrote:
>
>> Unfortunately, binary compatibility between Open MPI release versions has
>> never been guaranteed (even between subreleases).
>>
>> That being said, we have fixed this issue and expect to support binary
>> compatibility between Open MPI releases starting with v1.3.2 (v1.3.1 should
>> be released soon; we're aiming for v1.3.2 towards the beginning of next
>> month).
>>
>>
>>
>> On Mar 10, 2009, at 11:59 AM, Serge wrote:
>>
>> Hello,
>>>
>>> We have a number of applications built with Open MPI 1.2 in a shared
>>> multi-user environment. The Open MPI library upgrade has been always
>>> transparent and painless within the v1.2 branch. Now we would like to
>>> switch to Open MPI 1.3 as seamlessly. However, an application built with
>>> ompi v1.2 will not run with the 1.3 library; the typical error messages
>>> are given below. Apparently, the type ompi_communicator_t has changed.
>>>
>>> Symbol `ompi_mpi_comm_null' has different size in shared object,
>>> consider re-linking
>>> Symbol `ompi_mpi_comm_world' has different size in shared object,
>>> consider re-linking
>>>
>>> Do I have to rebuild all the applications with Open MPI 1.3?
>>>
>>> Is there a better way to do a smooth upgrade?
>>>
>>> Thank you.
>>>
>>> = Serge
>>>
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