Re: [OMPI devel] Open MPI: Undefined reference to pthread_atfork
Can you send all the information listed here:
https://www.open-mpi.org/community/help/
> On Jun 22, 2018, at 4:44 PM, lille stor wrote:
>
> Thanks again Jeff.
>
> Here is the output of running "mpic++" with parameter "--showme" (in bold
> what "mpic++" added):
>
> g++ test.cpp -lUtils -pthread -Wl,-rpath -Wl,/home/dummy/openmpi/build/lib
> -Wl,--enable-new-dtags -L/home/dummy/openmpi/build/lib -lmpi
>
> This fails to compile with the error "Undefined reference to pthread_atfork".
>
> Nonetheless, if a program uses directly "libmpi.so" it can be compiled
> successfully with the parameters "-L/home/dummy/openmpi/build/lib -lmpi" like
> you suggested in a previous email).
>
> The problem is that the program I am trying to compile does not use directly
> "libmpi.so" but through the library "libMyUtils.so". This makes the usage of
> parameters "-L/home/dummy/openmpi/build/lib -lmpi" not possible.
>
> Any more suggestions?
>
> Thanks,
>
> L.
>
>
>
>
> Sent: Friday, June 22, 2018 at 10:17 PM
> From: "Jeff Squyres (jsquyres)"
> To: "lille stor"
> Cc: "Open MPI Developers List"
> Subject: Re: [OMPI devel] Open MPI: Undefined reference to pthread_atfork
> On Jun 22, 2018, at 4:09 PM, lille stor wrote:
> >
> > I tried compile the C++ program using "mpic++" like you suggested but
> > unfortunately g++ still throws the same errror
> > ("/home/dummy/openmpi/build/lib/libopen-pal.so.20: undefined reference to
> > pthread_atfork").
> >
> > I suspect that the problem maybe to the fact that the C++ program does not
> > use directly Open MPI library but through another library (hence the
> > parameter "-Wl,-rpath-link,/home/dummy/openmpi/build/lib" when compiling
> > it), therefore one cannot pass the usual parameters
> > "-L/home/dummy/openmpi/build/lib -lmpi" to g++. To summarize the dependency
> > flow: program -> library -> Open MPI library.
>
> If your program uses mpic++ instead of g++, then mpic++ should add all the
> relevant parameters to compile an Open MPI program (including, if necessary,
> -pthread or -lpthread).
>
> What does "mpic++ --showme" show?
>
> Can you compile a simple C or C++ MPI program manually? (using mpicc /
> mpic++, without going through the secondary program)
>
> --
> Jeff Squyres
> jsquy...@cisco.com
>
--
Jeff Squyres
jsquy...@cisco.com
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Re: [OMPI devel] Open MPI: Undefined reference to pthread_atfork
Thanks again Jeff.
Here is the output of running "mpic++" with parameter "--showme" (in bold what "mpic++" added):
g++ test.cpp -lUtils -pthread -Wl,-rpath -Wl,/home/dummy/openmpi/build/lib -Wl,--enable-new-dtags -L/home/dummy/openmpi/build/lib -lmpi
This fails to compile with the error "Undefined reference to pthread_atfork".
Nonetheless, if a program uses directly "libmpi.so" it can be compiled successfully with the parameters "-L/home/dummy/openmpi/build/lib -lmpi" like you suggested in a previous email).
The problem is that the program I am trying to compile does not use directly "libmpi.so" but through the library "libMyUtils.so". This makes the usage of parameters "-L/home/dummy/openmpi/build/lib -lmpi" not possible.
Any more suggestions?
Thanks,
L.
Sent: Friday, June 22, 2018 at 10:17 PM
From: "Jeff Squyres (jsquyres)"
To: "lille stor"
Cc: "Open MPI Developers List"
Subject: Re: [OMPI devel] Open MPI: Undefined reference to pthread_atfork
On Jun 22, 2018, at 4:09 PM, lille stor wrote:
>
> I tried compile the C++ program using "mpic++" like you suggested but unfortunately g++ still throws the same errror ("/home/dummy/openmpi/build/lib/libopen-pal.so.20: undefined reference to pthread_atfork").
>
> I suspect that the problem maybe to the fact that the C++ program does not use directly Open MPI library but through another library (hence the parameter "-Wl,-rpath-link,/home/dummy/openmpi/build/lib" when compiling it), therefore one cannot pass the usual parameters "-L/home/dummy/openmpi/build/lib -lmpi" to g++. To summarize the dependency flow: program -> library -> Open MPI library.
If your program uses mpic++ instead of g++, then mpic++ should add all the relevant parameters to compile an Open MPI program (including, if necessary, -pthread or -lpthread).
What does "mpic++ --showme" show?
Can you compile a simple C or C++ MPI program manually? (using mpicc / mpic++, without going through the secondary program)
--
Jeff Squyres
jsquy...@cisco.com
___
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Re: [OMPI devel] Open MPI: Undefined reference to pthread_atfork
On Jun 22, 2018, at 4:09 PM, lille stor wrote:
>
> I tried compile the C++ program using "mpic++" like you suggested but
> unfortunately g++ still throws the same errror
> ("/home/dummy/openmpi/build/lib/libopen-pal.so.20: undefined reference to
> pthread_atfork").
>
> I suspect that the problem maybe to the fact that the C++ program does not
> use directly Open MPI library but through another library (hence the
> parameter "-Wl,-rpath-link,/home/dummy/openmpi/build/lib" when compiling it),
> therefore one cannot pass the usual parameters
> "-L/home/dummy/openmpi/build/lib -lmpi" to g++. To summarize the dependency
> flow: program -> library -> Open MPI library.
If your program uses mpic++ instead of g++, then mpic++ should add all the
relevant parameters to compile an Open MPI program (including, if necessary,
-pthread or -lpthread).
What does "mpic++ --showme" show?
Can you compile a simple C or C++ MPI program manually? (using mpicc / mpic++,
without going through the secondary program)
--
Jeff Squyres
jsquy...@cisco.com
___
devel mailing list
devel@lists.open-mpi.org
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Re: [OMPI devel] Open MPI: Undefined reference to pthread_atfork
Hi Jeff,
Thanks for the feedback.
I tried compile the C++ program using "mpic++" like you suggested but unfortunately g++ still throws the same errror ("/home/dummy/openmpi/build/lib/libopen-pal.so.20: undefined reference to pthread_atfork").
I suspect that the problem maybe to the fact that the C++ program does not use directly Open MPI library but through another library (hence the parameter "-Wl,-rpath-link,/home/dummy/openmpi/build/lib" when compiling it), therefore one cannot pass the usual parameters "-L/home/dummy/openmpi/build/lib -lmpi" to g++. To summarize the dependency flow: program -> library -> Open MPI library.
Any other sugestions on to solve this issue?
Thank you,
L.
Sent: Friday, June 22, 2018 at 9:57 PM
From: "Jeff Squyres (jsquyres) via devel"
To: "Open MPI Developers List"
Cc: "Jeff Squyres (jsquyres)"
Subject: Re: [OMPI devel] Open MPI: Undefined reference to pthread_atfork
I think Ralph is a little confused -- 2.1.3 is recent enough. :-)
Are you using "mpic++" to compile your application? That should add in all the relevant flags that are needed to compile an Open MPI C++ application.
> On Jun 22, 2018, at 3:29 PM, r...@open-mpi.org wrote:
>
> OMPI 2.1.3??? Is there any way you could update to something more recent?
>
>> On Jun 22, 2018, at 12:28 PM, lille stor wrote:
>>
>> Hi,
>>
>>
>> When compiling a C++ source file named test.cpp that needs a shared library named libUtils.so (which in its turn needs Open MPI shared library, hence the parameter -Wl,-rpath-link,/home/dummy/openmpi/build/lib ) as follows:
>>
>> g++ test.cpp -lUtils -Wl,-rpath-link,/home/dummy/openmpi/build/lib
>> An error is thrown /home/dummy/openmpi/build/lib/libopen-pal.so.20: undefined reference to pthread_atfork.
>>
>> I passed -pthread and -lpthread (before and after -lUtils) to g++ but none of these solved the error.
>>
>>
>> Environment where this error is thrown:
>>
>> OS: Ubuntu 14.04
>> Compiler: g++ 4.9
>> MPI: Open MPI 2.1.3
>>
>> Thank you for your help,
>>
>> L.
>>
>>
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>
> ___
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jsquy...@cisco.com
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Re: [OMPI devel] Open MPI: Undefined reference to pthread_atfork
I think Ralph is a little confused -- 2.1.3 is recent enough. :-) Are you using "mpic++" to compile your application? That should add in all the relevant flags that are needed to compile an Open MPI C++ application. > On Jun 22, 2018, at 3:29 PM, r...@open-mpi.org wrote: > > OMPI 2.1.3??? Is there any way you could update to something more recent? > >> On Jun 22, 2018, at 12:28 PM, lille stor wrote: >> >> Hi, >> >> >> When compiling a C++ source file named test.cpp that needs a shared library >> named libUtils.so (which in its turn needs Open MPI shared library, hence >> the parameter -Wl,-rpath-link,/home/dummy/openmpi/build/lib ) as follows: >> >> g++ test.cpp -lUtils -Wl,-rpath-link,/home/dummy/openmpi/build/lib >> An error is thrown /home/dummy/openmpi/build/lib/libopen-pal.so.20: >> undefined reference to pthread_atfork. >> >> I passed -pthread and -lpthread (before and after -lUtils) to g++ but none >> of these solved the error. >> >> >> Environment where this error is thrown: >> >> OS: Ubuntu 14.04 >> Compiler: g++ 4.9 >> MPI: Open MPI 2.1.3 >> >> Thank you for your help, >> >> L. >> >> >> ___ >> devel mailing list >> devel@lists.open-mpi.org >> https://lists.open-mpi.org/mailman/listinfo/devel > > ___ > devel mailing list > devel@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/devel -- Jeff Squyres jsquy...@cisco.com ___ devel mailing list devel@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/devel
Re: [OMPI devel] Open MPI: Undefined reference to pthread_atfork
OMPI 2.1.3??? Is there any way you could update to something more recent? > On Jun 22, 2018, at 12:28 PM, lille stor wrote: > > Hi, > > > When compiling a C++ source file named test.cpp that needs a shared library > named libUtils.so (which in its turn needs Open MPI shared library, hence the > parameter -Wl,-rpath-link,/home/dummy/openmpi/build/lib ) as follows: > > g++ test.cpp -lUtils -Wl,-rpath-link,/home/dummy/openmpi/build/lib > An error is thrown /home/dummy/openmpi/build/lib/libopen-pal.so.20: undefined > reference to pthread_atfork. > > I passed -pthread and -lpthread (before and after -lUtils) to g++ but none of > these solved the error. > > > Environment where this error is thrown: > > OS: Ubuntu 14.04 > Compiler: g++ 4.9 > MPI: Open MPI 2.1.3 > > Thank you for your help, > > L. > > > ___ > devel mailing list > devel@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/devel ___ devel mailing list devel@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/devel
[OMPI devel] Open MPI: Undefined reference to pthread_atfork
Hi, When compiling a C++ source file named test.cpp that needs a shared library named libUtils.so (which in its turn needs Open MPI shared library, hence the parameter -Wl,-rpath-link,/home/dummy/openmpi/build/lib ) as follows: g++ test.cpp -lUtils -Wl,-rpath-link,/home/dummy/openmpi/build/lib An error is thrown /home/dummy/openmpi/build/lib/libopen-pal.so.20: undefined reference to pthread_atfork. I passed -pthread and -lpthread (before and after -lUtils) to g++ but none of these solved the error. Environment where this error is thrown: OS: Ubuntu 14.04 Compiler: g++ 4.9 MPI: Open MPI 2.1.3 Thank you for your help, L. ___ devel mailing list devel@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/devel
