https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/MKL-7-0-zgemm-performance-with-small-matrices/m-p/932593#M13848 I reported this issue with MKL 6.1. Hopefully it is on the enhancement list for MKL 7.X.<BR />I have a general purpose MATRIX library ( Rogue Wave Math.h++) that was easy to retrofit to use MKL. My application uses a wide variety of complex matrix sizes from 6x6 to 500x500.<BR />For small matrices, I took a big performance hit in using MKL due to some obvious overhead in MKL calls.<BR />I ended up having to derive special small matrix classes to call an inline zgemm.<BR />Using Rational Quantify shows the bottleneck to clearly be zgemm in MKL. Wed, 20 Oct 2004 03:33:16 GMT AndrewC 2004-10-20T03:33:16Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/MKL-7-0-zgemm-performance-with-small-matrices/m-p/932593#M13848 I reported this issue with MKL 6.1. Hopefully it is on the enhancement list for MKL 7.X.<BR />I have a general purpose MATRIX library ( Rogue Wave Math.h++) that was easy to retrofit to use MKL. My application uses a wide variety of complex matrix sizes from 6x6 to 500x500.<BR />For small matrices, I took a big performance hit in using MKL due to some obvious overhead in MKL calls.<BR />I ended up having to derive special small matrix classes to call an inline zgemm.<BR />Using Rational Quantify shows the bottleneck to clearly be zgemm in MKL. Wed, 20 Oct 2004 03:33:16 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/MKL-7-0-zgemm-performance-with-small-matrices/m-p/932593#M13848 AndrewC 2004-10-20T03:33:16Z