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
