I have some legacy f77 code that I’ve been testing the 5.2 versus 6.0 compiler. The system I am running on is a Intel Pentium 4 running Suse 9.3, Linux 2.6.11. Doing a
I get 5.2-4 and 6.0-8 respectively. The CPU times I get for two different programs on 5.2 are;
238.951 and 221.501
For the 6.0 run for the same programs I get;
268.297 and 245.096
For both cases the compiler options concerning optimization are;
-fast -fastsse -Miniline
I have tested other programs and have gotten consistent results with 6.0 producing slower code than 5.2. This also appears to be true on our 64-bit Opteron systems as well. However, I would be very happy to move to 6.0 if I can resolve this problem. That level corrects execution-time problems in other programs that are compiled with 5.2 on our Linux 2.4 systems.