Test executables for scalapack are provided in /usr/lib//scalapack, for both openmpi and mpich versions. Test executables for PBLAS and BLACS are provided in the PBLAS and BLACS subdirectories. These tests are most conveniently launched by running cmake's ctest in the directory containing the executables (and CTestTestfile.cmake). Copy the test directories to a writable location to allow temporary files and subdirs to be created by ctest.