libmklccgdll is one of several (others include libmkl_blacs_intelmpi , libmkl_blacs_openmpi , etc.). Its specific job is to resolve symbols and manage communications for the Cluster Compatibility mode, which ensures that MKL’s internal MPI calls are compatible with the user’s chosen MPI implementation (e.g., Intel MPI, OpenMPI, MPICH).
C:\Program Files (x86)\Intel\oneAPI\mkl\latest\redist\intel64 libmklccgdll work
mpiicpc -o my_app my_app.cpp \ -L$MKLROOT/lib/intel64 \ -lmkl_intel_lp64 \ -lmkl_intel_thread \ -lmkl_core \ -lmkl_blacs_intelmpi_lp64 \ -lmkl_scalapack_lp64 \ -lmkl_ccgdll \ -liomp5 -lpthread -lm libmklccgdll work
This error occurs when an application tries to call a function inside the DLL, but the file is not in the system PATH or the application's folder. libmklccgdll work