Approximatrix Forums — OpenMP

Re: OpenMP

2012-11-10T17:06:48Z

Jeff,

Thank you, now it compiles (SF 1.35). However, OpenMp program
runs slower... But it is another story, I believe....
BTW, I think there are still some problems with project management.
Clean project button deletes also exe files which belong to
other projects residing in the same folder.

Best regards,
Carlos Herrera

Re: OpenMP

2012-11-09T15:04:59Z

Carlos,

You were almost there. You also need to add the directive "-lpthread" to the linker. Your linker options should look like:

-lgomp -lpthread

Let me know if you have any other issues, and keep us posted on your progress.

OpenMP

2012-11-09T14:35:44Z

Hi,
I have decided to give OpenMP a first try with the brand new SF 1.34 (winXP, 32bit).
After setting the environment variable OMP_NUM_THREADS=2
I tried to compile a simple project with -fopenmp option.
It did not work:

build\test1.o:D:\Projects\SimpleFortran\OpenMp/test1.f90:7: undefined reference to `omp_get_num_threads'
build\test1.o:D:\Projects\SimpleFortran\OpenMp/test1.f90:7: undefined reference to `omp_get_thread_num'
build\test1.o: In function `a1_':
D:\Projects\SimpleFortran\OpenMp/test1.f90:7: undefined reference to `GOMP_parallel_start'
D:\Projects\SimpleFortran\OpenMp/test1.f90:7: undefined reference to `GOMP_parallel_end'.

Then I added -lgomp directive to the linker. Still no success, with different and much more cryptic
messages like:

c:/program files/simply fortran/mingw-w64/bin/../lib/gcc/x86_64-w64-mingw32/4.7.2/../../../../x86_64-w64-mingw32/lib/../lib32\libgomp.a(team.o): In function `gomp_mutex_destroy':
f:\workspace\gcc\obj\gcc\x86_64-w64-mingw32\32\libgomp/../../../../../src/gcc-4.7.2/libgomp/config/posix/mutex.h:54: undefined reference to `_imp__pthread_mutex_destroy'

Any ideas what to do next? Thanks in advance.

Carlos Herrera