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From: Greg Watson (gwatson_at_[hidden])
Date: 2006-03-17 10:57:21


$ mpicc -showme
gcc -I/usr/local/include -I/usr/local/include/openmpi -I/usr/local/
include/openmpi/opal -I/usr/local/include/openmpi/orte -I/usr/local/
include/openmpi/ompi -L/usr/local/lib -lmpi -lorte -lopal -lutil -
lnsl -ldl -lbproc -lbproc -lbproc -lbproc -lbproc -lbproc -lpthread -
lrt -Wl,--export-dynamic -lm -lutil -lnsl -ldl

Looks like -lpthread is there...

Thanks,

Greg

On Mar 17, 2006, at 8:33 AM, Brian Barrett wrote:

> On Mar 17, 2006, at 10:17 AM, Greg Watson wrote:
>
>> I'm building OMPI 1.0.2a9 on a bproc machine (Yellow Dog Linux 4.0/
>> ppc). It just has an ethernet interface, no fancy network.
>>
>> I've tried configuring as follows:
>>
>> ./configure --enable-static --disable-shared --without-threads --
>> with-
>> devel-headers
>>
>> and
>>
>> ./configure --enable-static --disable-shared --without-threads --
>> without-mpi-threads --with-devel-headers
>
> The second one should be --disable-mpi-threads, but it really doesn't
> matter - specifying --without-threads will automatically disable mpi
> threads. So these are both correct for what you are trying to do.
> Clearly, however, something else is going on :/.
>
>> In both cases, I'm still seeing the thread library linked in the
>> final executable:
>>
>> $ mpicc -o testmpi testmpi.c
>> $ ldd testmpi
>> libutil.so.1 => /lib/libutil.so.1 (0x0f590000)
>> libnsl.so.1 => /lib/libnsl.so.1 (0x0e850000)
>> libdl.so.2 => /lib/libdl.so.2 (0x0fdc0000)
>> libbproc.so.4 => /usr/lib/libbproc.so.4 (0x0fe50000)
>> libpthread.so.0 => /lib/tls/libpthread.so.0 (0x0fc40000)
>> librt.so.1 => /lib/tls/librt.so.1 (0x0f660000)
>> libm.so.6 => /lib/tls/libm.so.6 (0x30013000)
>> libc.so.6 => /lib/tls/libc.so.6 (0x0fe70000)
>> /lib/ld.so.1 => /lib/ld.so.1 (0x0ffd0000)
>> $
>
> What does "mpicc -showme" show? If it includes something like -
> pthread or -lpthread, can you send the config.log file from Open MPI?
>
> Since ldd doesn't list the OMPI libraries as dependencies, it's a
> pretty good assumption that they were statically linked in (so at
> least the --disable-shared part worked). Therefore, if mpicc doesn't
> explicitly list -pthread or -lpthread, then the dependency is coming
> from one of two places. Either the compiler is explicitly adding -
> lpthread anyway (unlikely) or one of the other libraries that we
> added a -l for does depend on pthreads for some reason. I can't
> think off hand what we might add to cause this, so it might mean
> searching through the list of libraries with ldd to see if one of
> them includes a dependency on /lib/tls/libpthread.so.
>
>> Checking ompi_config.h shows:
>>
>> #define HAVE_PTHREAD_H 1
>> #define OMPI_ENABLE_MPI_THREADS 0
>> #define OMPI_ENABLE_PROGRESS_THREADS 0
>> #define OMPI_HAVE_POSIX_THREADS 0
>> #define OMPI_HAVE_SOLARIS_THREADS 0
>> #define OMPI_THREADS_HAVE_DIFFERENT_PIDS 0
>>
>> If anyone can tell me what I'm doing wrong, it would be appreciated.
>> I need to get this working for a demo on Monday.
>
> That looks like Open MPI's configure script disabled threads
> support. The HAVE_PTHREAD_H should not be used to figure out if we
> should use pthread support or not - it's only given to indicate
> whether pthread.h exists as a useable header file.
>
> Brian
>
>
> --
> Brian Barrett
> Open MPI developer
> http://www.open-mpi.org/
>
>
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