Re: [f2py] f2py and OpenMP problem

On Thu, Jun 30, 2011 at 6:52 PM, Akand Islam <[email protected]> wrote:

> Hello,
> Following is my simple "omp_hello.f" program:
>
>  PROGRAM HELLO
>
>      INTEGER NTHREADS, TID, OMP_GET_NUM_THREADS,
>     +        OMP_GET_THREAD_NUM
>
> C     Fork a team of threads giving them their own copies of variables
> !$OMP PARALLEL PRIVATE(NTHREADS, TID)
>
>
> C     Obtain thread number
>      TID = OMP_GET_THREAD_NUM()
>      PRINT *, 'Hello World from thread = ', TID
>
> C     Only master thread does this
>      IF (TID .EQ. 0) THEN
>        NTHREADS = OMP_GET_NUM_THREADS()
>        PRINT *, 'Number of threads = ', NTHREADS
>      END IF
>
> C     All threads join master thread and disband
> !$OMP END PARALLEL
>      END
>
> I have made a python module "omp_hello.so" through f2py by following
> command:
> /usr/bin/f2py2.7 -c -m omp_hello omp_hello.f --f90flags="-fopenmp -lgomp"
>
>
Try:
/usr/bin/f2py2.7 -c -m omp_hello omp_hello.f --f90flags="-fopenmp" -lgomp

HTH,
Pearu



> Now when I try to import omp_hello in python it comes up with following
> errors:
> import omp_hello
> ImportError: /home/scipylot/Desktop/
> practice/omp_hello.so: undefined symbol: omp_get_thread_num_
>
> It seems for some reason "-fopenmp -lgomp" although shows no compilation
> error,  is not connected well and thats why module "omp_hello.so" can not
> execute any omp command. I will be grateful if some one please help to over
> come this.
>
> To be more specific, in my UBUNTU 11.04 system  gcc version 4.5.2, gfortran
> version 4.5.2, libgomp1 version 4.5.2. My default python is 2.7. Inspecting
> "nm omp_hello.so" shows following:
>
> 00003a70 T main
>         U malloc@@GLIBC_2.0
>         U memcpy@@GLIBC_2.0
>         U memset@@GLIBC_2.0
>         U omp_get_num_threads_
>         U omp_get_thread_num_
> 00006214 b omp_hello_error
> 00006210 b omp_hello_module
> 00004320 r options.2.1509
> 000062d8 b save_def
> 00001660 t set_data
>         U sprintf@@GLIBC_2.0
>         U stderr@@GLIBC_2.0
>         U strcmp@@GLIBC_2.0
>         U strlen@@GLIBC_2.0
>
>
> Thanks in advance.
>
> -- Akand
>
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