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Editorial Team
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Editorial Team
Asked: May 17, 20262026-05-17T22:49:28+00:00 2026-05-17T22:49:28+00:00

I am trying different kinds of parallelization using OpenMP. As a result I have

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I am trying different kinds of parallelization using OpenMP. As a result I have several lines of #pragma omp parallel for in my code which I (un-)comment alternating. Is there a way to make these lines conditional with something like the following, not working code?

   define OMPflag 1 
   #if OMPFlag pragma omp parallel for
   for ...
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  1. Editorial Team
    Editorial Team
    2026-05-17T22:49:29+00:00Added an answer on May 17, 2026 at 10:49 pm

    An OpenMP parallel construct can have an if clause specified. In Fortran I’d write something like this:

    !$omp parallel if(n>25) ... 
    

    I sometimes use this when a problem might be too small to bother parallelising. I guess you could use the same approach to check a debug flag at run time. I’ll leave it up to you to figure out the C++ syntax but it’s probably exactly the same.

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