topic Thread MKL FFT within a thread in Intel® oneAPI Math Kernel Library https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Thread-MKL-FFT-within-a-thread/m-p/852702#M6663 Using Intel Professional Fortran version 10 or 11. If you have a parallel region created<BR />via openmp and lets say eight threads. How do you get MKL FFT to thread within a thread?<BR />Seems like I just get one thread no matter what. Fri, 17 Jul 2009 14:46:51 GMT happyIntelCamper 2009-07-17T14:46:51Z Thread MKL FFT within a thread https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Thread-MKL-FFT-within-a-thread/m-p/852702#M6663 Using Intel Professional Fortran version 10 or 11. If you have a parallel region created<BR />via openmp and lets say eight threads. How do you get MKL FFT to thread within a thread?<BR />Seems like I just get one thread no matter what. Fri, 17 Jul 2009 14:46:51 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Thread-MKL-FFT-within-a-thread/m-p/852702#M6663 happyIntelCamper 2009-07-17T14:46:51Z Re: Thread MKL FFT within a thread https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Thread-MKL-FFT-within-a-thread/m-p/852703#M6664 <DIV style="margin:0px;"> <DIV id="quote_reply" style="margin-top: 5px; width: 100%;"> <DIV style="margin-left:2px;margin-right:2px;">Quoting - <A href="https://community.intel.com/en-us/profile/388007">happyIntelCamper</A></DIV> <DIV style="background-color:#E5E5E5; padding:5px;border: 1px; border-style: inset;margin-left:2px;margin-right:2px;"><EM>Using Intel Professional Fortran version 10 or 11. If you have a parallel region created<BR />via openmp and lets say eight threads. How do you get MKL FFT to thread within a thread?<BR />Seems like I just get one thread no matter what.</EM></DIV> </DIV> </DIV> <BR />If you want nested parallelism, you must set OMP_NESTED. It seems unlikely you would want this if you are running 8 threads in the outer region. If 8 threads is the normal limit, set by OMP_NUM_THREADS or otherwise, and you want more, you will need a larger value of OMP_NUM_THREADS. Fri, 17 Jul 2009 15:29:23 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Thread-MKL-FFT-within-a-thread/m-p/852703#M6664 TimP 2009-07-17T15:29:23Z