I have problems installing Open-mpi on a quadri-opteron workstation.
The configuring script fails alltogether with intel fortran. That's
presumably because intel fortran works on opterons in 32 bits mode only.
The installation works fine with g95 and gfortran (provided I specify
the 64 library in LD_LIBRARY_PATH in the case of gfortran)
But then, when I compile my code with mpif90, it takes about 15 minutes.
I have the same result on another (quadri dual-core) opteron workstation.
On the other hand compilation takes only about 10 seconds on a pentium 4
2.6 Ghz PC ( open-mpi + ifort).
Has anyone tried open-mpi on Opteron ? Did you have the same problem?
Any ideas would be appreciated.