[petsc-users] Problems with the intel compilers

Andreas Grassl Andreas.Grassl at student.uibk.ac.at
Tue Oct 27 17:16:54 CDT 2009

Hi Dominik,

Dominik Szczerba wrote:
> I have noticed already a longer while ago: setting up PETSc with the
> Intel compilers (--with-cc=icc --with-cxx=icpc) takes an order of
> magnitude longer than with the native GNU. The step taking most of the
> time is configuring mpich. I have tried to configure mpich separately
> and indeed, with gnu it is a breeze, with intel 10x slower. In both
> cases, linux both 32 and 64 bit, Ubuntu 9.04 and debian testing. Intel
> compilers 10.x and 11.x.
> I just wanted to ask opinion if anybody has similar observations and/or
> finds using intel worthwhile at all.

On itanium machines intel compilers produce much faster code compared to
gnu-compilers. On other machines I did not notice a big speed difference, but I
think intel compilers produce slightly faster code as well.



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