openmp flag in CMake?

[Kartik Jujare]

Hello,

Would be grateful if anyone could correct or direct me to the right solution.

As a test I have a following for loop is a step file

#pragma omp parallel

{

#pragma omp for //private(k) reduction(+:integral)

for (k = 0; k < 4; k++)

{

sleep(1);

}

}

Now the time outputs of the this for loop and another normal one (without openmp) are the same. I think the problem lies in the flag that I am passing in the Cmakefile but cant figure out what? 

I have tried setting the following flags:

SET (MPI_CXX_COMPILE_FLAGS "-fopenmp")  

//OR

SET (DEAL_II_CXX_FLAGS "-fopenmp")

I suppose I dont understand cmake very well. What would be an appropriate place to place the above line in the CMakeLists.txt

Thank you and regards,

Kartik Jujare

[Maxi Miller]

Can you try CMake-GUI? At least there you can find all occurences of openmp and enable it.

[Kartik Jujare]

Dear Maxi,

Thank you so much for reminding me of that !! Works fantastic!

Regards,

Kartik Jujare

[Jean-Paul Pelteret]

Dear Kartik,

There's both a section in the main and user-project documentation on CMake about how to configure CMake with extra compile and linker flags. Take a look there, and perhaps the information contained therein will help clear things up. I think that you need to extend `DEAL_II_CXX_FLAGS` or `DEAL_II_LINKER_FLAGS` with this extra flag after DEAL_II_INITIALIZE_CACHED_VARIABLES but before calling DEAL_II_INVOKE_AUTOPILOT or DEAL_II_SETUP_TARGET.

I hope that this helps.

Regards,

Jean-Paul

[Kartik Jujare]

Dear Jean,

Thank you for pointing that out. I somehow missed the the 3.7 section while browsing through it. 

Regards,

Kartik Jujare