Using MKL_DIRECT_CALL in Fortran Applications

The following examples of code and link lines show how to activate direct calls to Intel® oneAPI Math Kernel Library kernels in Fortran applications:

• Include mkl_direct_call.fi, to be preprocessed by the Fortran compiler preprocessor

  #     include "mkl_direct_call.fi"
        program   DGEMM_MAIN
  ....
  *      Call Intel MKL DGEMM
  ....
        call sub1()
        stop 1
        end
  
  *     A subroutine that calls DGEMM 
        subroutine sub1
  *      Call Intel MKL DGEMM
  
        end
  

• For multi-threaded Intel® oneAPI Math Kernel Library, compile with-fpp option for Intel Fortran compiler and with MKL_DIRECT_CALL preprocessor macro:

  ifort –DMKL_DIRECT_CALL –fpp your_application.f -Wl,--start-group $(MKLROOT)/lib/intel64/libmkl_intel_lp64.a 
  $(MKLROOT)/lib/intel64/libmkl_core.a $(MKLROOT)/lib/intel64/libmkl_intel_thread.a -Wl,--end-group -lpthread –lm -openmp -I$(MKLROOT)/include

• To use Intel® oneAPI Math Kernel Library in the sequential mode, compile with-fpp option for Intel Fortran compiler (or with -Mpreprocess for PGI compilers) and with MKL_DIRECT_CALL_SEQ preprocessor macro:

  ifort –DMKL_DIRECT_CALL_SEQ –fpp your_application.f -Wl,--start-group $(MKLROOT)/lib/intel64/libmkl_intel_lp64.a 
  $(MKLROOT)/lib/intel64/libmkl_core.a $(MKLROOT)/lib/intel64/libmkl_sequential.a -Wl,--end-group -lpthread –lm -I$(MKLROOT)/include