icc -O2 -qopenmp -mkl cblas_test.cpp The basic timing results are (with 16 threads in the thread regions): MKL VERSION 2018.0.03 2019.0.4 2020.0.4 2021.1TIME(s) for Non-Threaded: 20.07 23.42 20.68 20.08TIME(s) for Threaded : 1.67 1.89 38.54 38.30 Note the catastro...