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Subject: Re: [OMPI devel] 1.7.5: OpenShmem symbols are not weak
From: Jeff Squyres (jsquyres) (jsquyres_at_[hidden])
Date: 2014-04-07 18:35:37


Mike / Mellanox --

Does does OpenShmem define that there should be a profiling interface for SHMEM API functions (like MPI does)?

On Mar 31, 2014, at 7:21 PM, Mike Dubman <miked_at_[hidden]> wrote:

> 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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-- 
Jeff Squyres
jsquyres_at_[hidden]
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