https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Intel-MKL-slow/m-p/963890#M16072 Hi,<BR /><BR />when I compare the performance of MKL-LAPACK with an ifc compiled version of the netlib LAPACK, MKL 6.1.1 is almost two times slower.<BR /><BR />I use "MKL_SERIAL=yes" on a dual Xeon system running Redhat 9.<BR />MKL is linked with <BR />"-L/opt/intel/mkl61/lib/32 -lmkl_lapack -lmkl_ia32 -lguide -lpthread".<BR /><BR />Is there a mistake in how I use MKL ? Thu, 08 Apr 2004 15:47:23 GMT bebendorf 2004-04-08T15:47:23Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Intel-MKL-slow/m-p/963890#M16072 Hi,<BR /><BR />when I compare the performance of MKL-LAPACK with an ifc compiled version of the netlib LAPACK, MKL 6.1.1 is almost two times slower.<BR /><BR />I use "MKL_SERIAL=yes" on a dual Xeon system running Redhat 9.<BR />MKL is linked with <BR />"-L/opt/intel/mkl61/lib/32 -lmkl_lapack -lmkl_ia32 -lguide -lpthread".<BR /><BR />Is there a mistake in how I use MKL ? Thu, 08 Apr 2004 15:47:23 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Intel-MKL-slow/m-p/963890#M16072 bebendorf 2004-04-08T15:47:23Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Intel-MKL-slow/m-p/963891#M16073 <P>There have been some functions within LAPACK which have run slowly because of some issues with dlamch, the routine which determines certain double precision parameters for the machine.</P> <P>What routine(s) are you calling?</P> <P>Bruce</P> <DIV></DIV> Sat, 24 Apr 2004 03:12:27 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Intel-MKL-slow/m-p/963891#M16073 Intel_C_Intel 2004-04-24T03:12:27Z