https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/is-FFTW-wrapper-call-thread-safe-inside-OpenMP-region/m-p/1498529#M34700 <P>This is best answered by those on the MKL Forum. I'll move this thread there.</P> Fri, 23 Jun 2023 10:57:10 GMT Barbara_P_Intel 2023-06-23T10:57:10Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/is-FFTW-wrapper-call-thread-safe-inside-OpenMP-region/m-p/1498510#M34699 <P>Good Day!</P><P>&nbsp;</P><P>I am using the FFTW compatible wrapper for FFT and compiling the code with <STRONG>/Qmkl:</STRONG><SPAN><STRONG>sequential</STRONG>&nbsp;</SPAN>option. It works well in serial execution. The question I have is,</P><P>(A) if I do the same inside the OpenMP parallel region as mentioned below, is it thread safe?</P><P>Also,</P><P>(B) do I need to change the compiler option from /Qmkl:sequential to /Qmkl:parallel, or its not required since I am not going to use parallel threads within FFTW.</P><LI-CODE lang="fortran">!$OMP PARALLEL DEFAULT(NONE) PRIVATE(plan, x, y) SHARED(n, FFTW_ESTIMATE) !$OMP DO ... CALL sfftw_plan_dft_r2c_1d(plan, n, x, y, FFTW_ESTIMATE) CALL sfftw_execute_dft(plan, x, y) CALL sfftw_destroy_plan(plan) ... !$OMP END DO !$OMP PARALLEL</LI-CODE><P>&nbsp;Appreciate any help I can get on this topic.</P> Fri, 23 Jun 2023 08:39:19 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/is-FFTW-wrapper-call-thread-safe-inside-OpenMP-region/m-p/1498510#M34699 mohanmuthu 2023-06-23T08:39:19Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/is-FFTW-wrapper-call-thread-safe-inside-OpenMP-region/m-p/1498529#M34700 <P>This is best answered by those on the MKL Forum. I'll move this thread there.</P> Fri, 23 Jun 2023 10:57:10 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/is-FFTW-wrapper-call-thread-safe-inside-OpenMP-region/m-p/1498529#M34700 Barbara_P_Intel 2023-06-23T10:57:10Z