In this section, we compare the numbers of exceptions: overflow exceptions, raised when appears a number which is too large for computation, and timeout exceptions, when the execution time of a test is longer than two minutes, which is arbitrarily considered not acceptable.
6_tab:PerfectClub_projection_exception_100 shows the numbers
of exceptions for P64 and PDD64, and the number of all tests in
PerfectClub projection sampled database. P64 is more robust than
PDD64, because it has no overflow nor timeout, whereas PDD has 
overflows and 
timeout exceptions that may block our analysis. For
the SPEC95 projection sampled database with 
tests, we however
do not have any exception.