Re: OpenMPI and Perl

> strings /usr/local/lib/perl/5.10.0/auto/Parallel/MPI/Simple/Simple.s +o | grep mpi (...) ompi_mpi_char
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This just shows that the symbol appears in Simple.so, but it doesn't tell if that occurrence is the implementation (i.e. the instance of a variable, code of a function, etc.) of the symbol, or just a reference to an external implementation, which it very likely is in that particular case...

Use objdump -tT, or nm on the other libs and look for the type of the symbol ("*UND*" means it's an undefined/external reference) to find out more. Presumably the symbol should be in defined/implemented in libmpich-p4mpd.so.1.0.

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Re^2: OpenMPI and Perl by spadacciniweb (Curate) on Nov 19, 2009 at 13:07 UTC
Yes `> objdump -tT /usr/local/lib/perl/5.10.0/auto/Parallel/MPI/Simple/Simp +le.so \| grep ompi_mpi_char 00000000 UND 00000000 ompi_mpi_char 00000000 D UND 00000000 ompi_mpi_char` [download] but there isn't in others libs. So this is the problem, isn't true? Mariano (($_="Mzz ojjdloobnf jt uvy5502383")=~y~b-zg2-5c96-81~a-z0-9~s)=~s~~~s; print	[reply] [d/l]
Re^3: OpenMPI and Perl by almut (Canon) on Nov 19, 2009 at 14:32 UTC
but there isn't in others libs. So this is the problem Looks like it, yes. Maybe your MPI library is the wrong version (too old)? A quick grep through the current Open MPI sources shows the symbol is defined in `./ompi/datatype/dt_module.c`. But I'm no Open MPI expert, and can't tell from the top of my head if that symbol should end up in the lib `libmpich-p4mpd.so.1.0` (which you seem to have), or in some other related lib... You could try compiling the sources yourself (unless you've already done so), and check every `.so/.a` file being created for the occurrence of the symbol.	[reply] [d/l] [select]
Re^4: OpenMPI and Perl by spadacciniweb (Curate) on Nov 19, 2009 at 15:22 UTC
Ok, I think my libmpich-p4mpd.so.1.0 lib is too old. It is a package (prebuild in my distribution). Now I am recompiling OpenMPI lib from source. Thank you, Mariano (($_="Mzz ojjdloobnf jt uvy5502383")=~y~b-zg2-5c96-81~a-z0-9~s)=~s~~~s; print	[reply]