Question regarding suitable optimization options in compiling a fortran code with Composer XE Update 11(344) in new machine: 64bit Intel Xeon E5-2687W 3.1GHz 8 cores. I have tried /Os, /O3, /Qxhost, /QxSSE2. For some reason, it ran slower than in 32 bit Intel Core 2 Duo T9550, 2.66 GHz machine.
Could you recommend optimization options for this Xeon configuration or possibily to exploit 8 cores other than OpenMP/MKL?
Thanks in advance for your help.