The performance difference between c/c++ kernels and fortran kernels - or c-complex/c++-complex can be compiler specific. You can build all relavent versions [each with a different PETSC_ARCH] and see if it makes a difference for you code.
The relavent configure options are: --with-fortran-kernels=generic [default 'none'] --with-clanguage=cxx [or default 'c'] --with-scalar-type=complex [default 'real'] Satish On Wed, 2 Dec 2009, Craig Tanis wrote: > Hi, > > The Petsc 3 manual (pdf)mentions using an optimized fortran kernel for > complex numbers, that somehow uses the same C interface. It refers to a > document on how to build these kernels, but that document does not appear to > be in the tarball (or on the anl.gov website). > > Furthermore, the FAQ on the website only mentions C and C++ in the section on > complex number performance... > > If someone could clarify what was possible, and where to look for more > information, that would be great! > thanks, > Craig
