This message is outofdate. I'll fix it in petsc-dev. The way to enable this feature is to rerun configure with the additional option
--with-fortran-kernels=generic You can use additonal option PETSC_ARCH with configure so that a new set of configuraton [with new set of libraries are created] - this way the old set is also useable. You can then check if the above option improves performance or not [and then stick with the higher perfoming version] For eg: if your current PETSC_ARCH is linux-gnu - you can do: ./bmake/linux-gnu/configure --with-fortran-kernels=generic PETSC_ARCH=linux-gnu-ftn-kernels make PETSC_ARCH=linux-gnu-ftn-kernels all make PETSC_ARCH=linux-gnu-ftn-kernels test Satish On Mon, 28 Aug 2006, Patrick Lechner wrote: > Dear all, > > I currently have the following problem and would be very grateful for any > useful advice: > > I have written a Fortran code that uses PETSc for the solution of various > linear systems with complex entries (both in the stiffness matrix and in the > load vector). When I use the PETSc-Log to check the times for my runs, I get > the following warning: > > ########################################################## > > # > # > # WARNING!!! > # > # > # > # The code for various complex numbers numerical > # > # kernels uses C++, which generally is not well > # > # optimized. For performance that is about 4-5 times > # > # faster, specify the flag -DPETSC_USE_FORTRAN_KERNELS # > # in base_variables and recompile the PETSc libraries. > # > > # > # > ########################################################## > > > My problem now is, that I can't find "base_variables" in my latest > PETSc-version (2.3.1-p15)... > Do I just add the flag to my cpp-flags in bmake/$PETSC_ARCH/petscconf? Or > should I do this modification somewhere else? > > Thanks a lot for any help with this! > Best wishes, > Patrick > > > > > ================================= > > Patrick Lechner > Numerical Analysist / Numerical Modeller > Flat 1 > 159 Hardgate > Aberdeen, AB11 6XQ > > Phone: 07815 927333 > E-mail: patrick at lechner.com > Homepage: http://www.patrick.lechner.com >
