We have (at the university) a dual boot computer with Intel Composer installed both on Windows 7 (composer2011 update 4) and Linux Debian 6.0.4 (same composer).
On Windows I only had Fortran installed. Last Friday I decided to install also Intel C++ composer and MinGW. The installation was successful but now all the executables compiled in Fortran run 3 times slower! I tried both recompiling and running previously compiled executables and all run 3 times slower than before. These files use openmp and mkl (so they need the respective dlls in the path). I thought it must be either something wrong with the shared libraries or windows made an automatic update that changed something or the antivirus is playing games.
-removing mingw and any occurrence of it in the path, registry or c:\\
-removing C++ composer
-removing all Intel Composer and Visual Studio 2008 and reinstalling
-clearing the PATH and pointing explicitly to the mkl and omp containing directories
-clearing the path, installing Intel redistributable libraries (update 4) and pointing to them in the path
-clearing the path, installing Intel redistributable libraries (update 9) and pointing to them in the path
All the above gave me the same results, 3x slower execution. Under Linux, the execution is the same as always, so, it's probably not a hardware problem.
I've ran out of ideas...
Thanks in advance,