compilation error when I compile WRF with OpenMP (smpar)

[nate-vnp]

I get this error message when I try to compile WRF version 3 with OpenMP parallelism, at the final linking stage when I link all the executables to create the wrf.exe:


libwrflib.a(module_tiles.o): In function `module_tiles_mp_set_tiles2_':
module_tiles.f90.text+0x2532): undefined reference to `omp_get_max_threads_'

Any ideas how to fix this ?

It seems the intel compiler does not want to do any parallelism ...

 

[kwerner]

Hi,
Can you let me know which version 3 (e.g., 3.8) you are compiling?
Do you know whether the OpenMP library was built with the version of Intel you are using to compile the WRF code?

Thanks!

 

[nate-vnp]

I do not know for sure.

Intel® Parallel Studio XE was the package I bought. I assumed OpenMP was included in the package.

So do I need to download a separate GNU OpenMP library ?

 

[nate-vnp]

There is a problem with OpenMP generally in my Intel compiler.

When I run a test program (attached) this is what happens:

+++++++++++++++++++++++++++++++++++++++++++++

gfortran -fopenmp omp_hello.f
[vaughanp@anders-lindroth Desktop]$ ./a.out
Hello World from thread = 1
Hello World from thread = 4
Hello World from thread = 2
Hello World from thread = 3
Hello World from thread = 0
Number of threads = 5
[vaughanp@anders-lindroth Desktop]$ ifort -fopenmp omp_hello.f
[vaughanp@anders-lindroth Desktop]$ ./a.out
./a.out: error while loading shared libraries: libiomp5.so: cannot open shared object file: No such file or directory
++++++++++++++++++++++++++++++++++++++++++++++++

So you see there is a problem with the Intel fortran compiler.

 

[nate-vnp]

I am compiling version 3.1.1 of WRF.

Now I am trying to compile with gfortran instead of the intel compiler in the hope that it works with OpenMP.

 

[nate-vnp]

I have found adding a "source" line to my bashrc file fixes the problem. Now I have the WRF version 3 running with open mp for the Intel compiler.

 

[kwerner]

I'm glad you were able to get past the compiling problem. Thanks for letting us know!