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Subject: Re: [OMPI devel] 1.7.5: OpenShmem symbols are not weak
From: Mike Dubman (miked_at_[hidden])
Date: 2014-03-31 19:21:39


thanks, we will fix that.

On Mon, Mar 31, 2014 at 5:04 PM, Ralph Castain <rhc_at_[hidden]> wrote:

> Hmmm...I'll ask the Mellanox folks to fix that, but it will have to be for
> 1.8.1 as we have to release 1.8.0 today for the upstream packagers. I
> expect 1.8.1 will go out in the next 1-2 months based on prior experience
> (we always get a bunch of corrections after initial stable release as more
> people pick those up).
>
>
> On Mar 31, 2014, at 1:14 AM, Bert Wesarg <Bert.Wesarg_at_[hidden]>
> wrote:
>
> > Hi all,
> >
> > while working on support for OpenShmem in our next Score-P measurement
> [1] release, we noticed that the liboshmem.so library from Open MPI does
> not mark the symbols as weak as one would expect. Here is an output of
> liboshmem.so on my 64bit ubuntu system. Lets try shmem_init:
> >
> > $ readelf -W --dyn-syms liboshmem.so.1.0.0 |grep 'shmem_init$'
> > 1098: 000000000001dac2 141 FUNC GLOBAL DEFAULT 11 shmem_init
> > 1228: 000000000001c73a 236 FUNC GLOBAL DEFAULT 11
> oshmem_shmem_init
> >
> > Oh, no pshmem_init. Maybe missing, but its legacy anyway. Lets try
> shmem_broadcast:
> >
> > $ readelf -W --dyn-syms liboshmem.so.1.0.0 |grep 'shmem_broadcast$'
> > 555: 000000000002769a 92 FUNC GLOBAL DEFAULT 11
> pshmem_broadcast
> > 577: 000000000001ed82 92 FUNC GLOBAL DEFAULT 11 shmem_broadcast
> >
> > Ok, we see the pshmem_broadcast and the shmem_broadcast symbol, but the
> latter is not WEAK. Btw, this function is not in the standard. Thus
> (finally) take a symbol from the standard:
> >
> > $ readelf -W --dyn-syms liboshmem.so.1.0.0 |grep 'shmem_barrier$'
> > 511: 000000000001d47e 24 FUNC GLOBAL DEFAULT 11
> oshmem_shmem_barrier
> > 525: 000000000001f250 217 FUNC GLOBAL DEFAULT 11 shmem_barrier
> > 1099: 0000000000027b68 217 FUNC GLOBAL DEFAULT 11 pshmem_barrier
> >
> > Again, no WEAK for shmem_barrier.
> >
> > For reference, the output for MPI_Init:
> >
> > $ readelf -W --dyn-syms libmpi.so.1.4.0 |grep 'MPI_Init$'
> > 1383: 00000000000841ff 484 FUNC WEAK DEFAULT 11 MPI_Init
> > 2051: 00000000000841ff 484 FUNC GLOBAL DEFAULT 11 PMPI_Init
> >
> > HTH,
> > Bert
> >
> > [1] http://www.vi-hps.org/projects/score-p
> >
> > --
> > Dipl.-Inf. Bert Wesarg
> > wiss. Mitarbeiter
> >
> > Technische Universität Dresden
> > Zentrum für Informationsdienste und Hochleistungsrechnen (ZIH)
> > 01062 Dresden
> > Tel.: +49 (351) 463-42451
> > Fax: +49 (351) 463-37773
> > E-Mail: Bert.Wesarg_at_[hidden]
> >
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>
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