Does all the PETSc error checking and logging reduce PETScs efficiency?
Actually the impact is quite small. But if it really concerns you to get the absolute fastest rate you can, then edit the file ${PETSC_DIR}/bmake/${PETSC_ARCH}/base.O and remove -DPETSC_DEBUG and -DPETSC_LOG. Then recompile the package. We do not recommend this unless you have a complete running code that is well tested, and you do not plan to alter it. Our measurements never indicate more then a 3 to 5% difference in performance with all error checking and profiling compiled out of PETSc.
