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Subject: Re: [OMPI devel] VampirTrace and MPI_Init_thread()
From: Lisandro Dalcin (dalcinl_at_[hidden])
Date: 2010-08-11 17:16:50


On 11 August 2010 03:12, Matthias Jurenz <matthias.jurenz_at_[hidden]> wrote:
> Hello Lisandro,
>
> this problem will be fixed in the next Open MPI release. There was an obsolete
> preprocessor condition around the MPI_Init_thread wrapper, so the source code
> could never be compiled :-(
>
> Thanks for the hint.
>
> Matthias
>

OK. Many thanks for you clarification.

BTW, I have and additional issue. I'm trying to build as shared
library from libvt*.a using by passing -whole-archive to the linker.
The idea behind this is to use that library with LD_PRELOAD to get MPI
tracing of a binary compiled with plain mpicc (i.e, not mpicc-vt). For
example, I managed to get this trick working with MPE. Moreover, I can
enable MPI profiling at runtime in a Python script using mpi4pt by
dlopen'ing the shared lib with profiling symbols before loading the
mpi4py.MPI Python extension module. Being able to profile without a
recompile is nice ;-)

However, see this:

$ pwd
/usr/local/openmpi/1.4.2/lib

$ ll libvt*
-rw-r--r--. 1 root root 410784 2010-05-05 20:40 libvt.a
-rw-r--r--. 1 root root 197618 2010-05-05 20:40 libvt.fmpi.a
-rw-r--r--. 1 root root 569128 2010-05-05 20:40 libvt.mpi.a
-rw-r--r--. 1 root root 503514 2010-05-05 20:40 libvt.omp.a
-rw-r--r--. 1 root root 661466 2010-05-05 20:40 libvt.ompi.a

$ nm libvt* | grep pomp_rd_table
         U pomp_rd_table
         U pomp_rd_table
         U pomp_rd_table
         U pomp_rd_table
         U pomp_rd_table
         U pomp_rd_table
         U pomp_rd_table
         U pomp_rd_table
         U pomp_rd_table
         U pomp_rd_table

That symbol (and possibly others) are undefined and I cannot found
them elsewhere. Is there any easy way to build a shared lib with the
MPI_xxx symbols?

-- 
Lisandro Dalcin
---------------
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