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Subject: Re: [OMPI devel] 1.5.5rc1 tested: MacOS/ppc (w/ 1 failure and a "CMR")
From: Matthias Jurenz (matthias.jurenz_at_[hidden])
Date: 2012-02-15 12:25:55


Thanks for testing, Paul.

I think we need an additional configure test which disables VT if

a) weak symbol support is disabled/not available

- or more precise -

b) configuring on PPC/Mac10.4 and the used GNU compiler version is older or
equal to 4.0.1

I prefer to option b) because VT (i.e. PMPI) should also work without weak
symbol support (at least it does on my laptop with gcc 4.4.3 and '--disable-
weak-symbols'). On the other hand, in the most cases the compiler supports
weak symbols, so option a) would also work, unless weak symbol support is
disabled by the configure option '--disable-weak-symbols'.
Jeff, what's your opinion?

Matthias

On Wednesday 15 February 2012 10:33:30 Paul Hargrove wrote:
> See responses mixed in below.
>
> On Wed, Feb 15, 2012 at 1:02 AM, Matthias Jurenz <
>
> matthias.jurenz_at_[hidden]> wrote:
> > Unfortunately, we don't have access to a PPC system with MacOS 10.4 to
> > try to
> > reproduce the error.
>
> Not too surprising. I'll see what I can do to help resolve the problem.
>
> > Paul, could you please check for the definition of the macro
> > OPAL_HAVE_WEAK_SYMBOLS in ompi_config.h?
>
> ompi_config.h doesn't contain that macro.
> However, opal_config.h shows no weak symbol support:
> #define HWLOC_HAVE_ATTRIBUTE_WEAK_ALIAS 0
> #define OPAL_HAVE_ATTRIBUTE_WEAK_ALIAS 0
> #define OPAL_HAVE_WEAK_SYMBOLS 0
>
> > I assume that the ancient GNU compiler
> > on PPC/MacOS10.4 does not support weak-symbols which cause the multiply
> > definitions.
>
> Does that mean I should simply not expect to get VT built there?
>
> > Furthermore, could you please try to build the following code to test
> > whether
> > the PMPI interface of Open MPI works in general?
> >
> > #include <stdio.h>
> > #include <mpi.h>
> >
> > int MPI_Finalize() {
> >
> > printf( "inside MPI_Finalize() wrapper\n" );
> > return PMPI_Finalize();
> >
> > }
> >
> > int main(int argc, char** argv) {
> >
> > MPI_Init(&argc, &argv);
> > MPI_Finalize();
> >
> > }
>
> I am assuming I am supposed to build that with VT disabled in my OMPI
> build.
> Doing so, I see that PMPI is apparently not working:
> $ ./bin/mpicc pmpi_test.c
> /usr/bin/ld: warning multiple definitions of symbol _MPI_Finalize
> /var/tmp//ccHZvZ3B.o definition of _MPI_Finalize in section (__TEXT,__text)
> /Users/phargrov/OMPI/openmpi-1.5.5rc1/INST/lib/libmpi.dylib(single module)
> definition of _MPI_Finalize
>
> > Maybe the error occurs only if this code is in a shared library which
> > depends
> > on the MPI library (as does the libvt-mpi). Therefor, run the following:
> >
> > $ gcc -fPIC -shared pmpi_test.c -I<mpi-inc-dir> -o libpmpi_test.dylib
> > -L<mpi-
> > lib-dir> -lmpi
>
> I assume this check might be redundant given that the previous one failed.
> However, here it is anyway:
> $ gcc -fPIC -shared pmpi_test.c -Iinclude -o libpmpi_test.dylib -Llib
> powerpc-apple-darwin8-gcc-4.0.1: unrecognized option '-shared'
> /usr/bin/ld: Undefined symbols:
> _MPI_Init
> _PMPI_Finalize
> collect2: ld returned 1 exit status
>
>
> -Paul
>
> > Thanks!
> >
> > Matthias
> >
> > > On 12/14/2011 2:51 PM, Paul H. Hargrove wrote:
> > > I've attempted to reproduce the failure reported below for MacOS 10.4
> > > for PPC on an X86-64 system.
> > > First, I've realized that while I reported "make check" as the source
> > > of the problem, it occurs at "make".
> > >
> > > Regardless of that mistake in my reporting, I was unable to reproduce
> > > the problem, making this a PPC-specific problem as far as I can tell.
> > > Instead of 255 instances of "ld: multiple definitions of symbol _MPI_*"
> > > I get instances of "ld: warning multiple definitions of symbol _MPI*",
> > > where the only difference is the addition of the word "warning".
> > > However, this is apparently non-fatal on the x86-64 but fatal by
> > > default on PPC.
> > >
> > > -Paul
> > >
> > > On 12/13/2011 9:30 PM, Paul H. Hargrove wrote:
> > > > Using the 1.5.5rc1 tarball, I've repeated tests on the following
> > > > platforms for which I recently reported 1.4.5rc1 results:
> > > >
> > > > MacOS 10.5 (Leopard) on PPC:
> > > > powerpc-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5488)
> > > > MacOS 10.4 (Tiger) on PPC:
> > > > powerpc-apple-darwin8-gcc-4.0.1 (GCC) 4.0.1 (Apple Computer, Inc.
> > > > build 5341)
> > > > MacOS 10.3 (Panther) on PPC:
> > > > gcc (GCC) 3.3 20030304 (Apple Computer, Inc. build 1666)
> > > >
> > > > On MacOS 10.5 "make all install check" completed w/o incident.
> > > >
> > > > Unfortunately, on MacOS 10.4 (Tiger) I get multiply defined symbols
> > > >
> > > > from VT in "make check":
> > > >> Making check in vtlib
> > > >> CCLD libvt-mpi.la
> > > >> ld: multiple definitions of symbol _MPI_Abort
> > > >> .libs/libvt_mpi_la-vt_mpiwrap.o definition of _MPI_Abort in section
> > > >> (__TEXT,__text)
> > > >> /Users/phargrov/openmpi-1.5.5rc1/BUILD-
> >
> > dflt/ompi/contrib/vt/vt/../../../.libs/libmpi.dylib(single
> >
> > > >> module) definition of _MPI_Abort
> > > >
> > > > [...253 more "ld: multiple definitions of symbol" errors...]
> > > >
> > > >> ld: multiple definitions of symbol _MPI_Win_wait
> > > >> .libs/libvt_mpi_la-vt_mpiwrap.o definition of _MPI_Win_wait in
> > > >> section (__TEXT,__text)
> > > >> /Users/phargrov/openmpi-1.5.5rc1/BUILD-
> >
> > dflt/ompi/contrib/vt/vt/../../../.libs/libmpi.dylib(single
> >
> > > >> module) definition of _MPI_Win_wait
> > > >> /usr/bin/libtool: internal link edit command failed
> > > >> make[4]: *** [libvt-mpi.la] Error 1
> > > >
> > > > Unlike the compilation failure for 1.4.5rc1 on MacOS 10.3 (Panther),
> > > > I
> > > >
> > > > got the following at configure time:
> > > >> configure: WARNING: Open MPI does not support OS X prior to version
> > > >> 10.4 (Tiger)
> > > >> configure: error: Cannot continue
> > > >
> > > > So I would like to "CMR" this logic to the 1.4 branch.
> > > >
> > > >
> > > > -Paul
> > > >
> > > > On 12/13/2011 8:36 PM, Jeff Squyres wrote:
> > > >> In the usual place:
> > > >>
> > > >> http://www.open-mpi.org/software/ompi/v1.5/
> > > >>
> > > >> Please test! I would really like to get this out by the end of the
> > > >> week.
> > > >>
> > > >> Two issues *might* still be considered for this release:
> > > >>
> > > >> Putting back the openib minor fixes
> > > >> https://svn.open-mpi.org/trac/ompi/ticket/2930
> > > >>
> > > >> Making the "your SM file is on an NFS!" warning disable-able
> > > >> (this is the v1.4 ticket)
> > > >> https://svn.open-mpi.org/trac/ompi/ticket/2937
> > > >>
> > > >> They would both need to be fixed in the *immediate future* to be
> > > >> considered.
> > >
> > > --
> > > Paul H. Hargrove PHHargrove_at_[hidden]
> > > Future Technologies Group
> > > HPC Research Department Tel: +1-510-495-2352
> > > Lawrence Berkeley National Laboratory Fax: +1-510-486-6900