On Tue, 13 Jan 2004 08:54:30 -0000 "Cannon, Andrew" <Andrew.Cannon@xxxxxxxxx> wrote: > I'm just collating some results from a test run I did using a Monte > Carlo code on two different computers, one was a 1.5GHz P4 running > Windows 2000 and the other was a 2.0GHz P4 running RH8. > > The Windows machine was faster than the RH machine. I ran the test again > and got the same result. The difference was only 10%, but it was a > surprise. Has anyone got any idea why there was so much of a difference? > > The test case didn't use much memory and the version of the program was > the same in both cases (apart from running on different OSs of course). Hey Andrew, Assuming you compiled this yourself with gcc make sure you used the -O2 or -O3 compiler optimization switch, it often makes a very big difference. If you're sure the simulation isn't I/O bound in some way then you'll have to consider a wide range of possible problems. A misconfigured kernel or BIOS setting, or even a hardware problem. In particular ensure your CPU isn't being throttled because of overheating. Good Luck, Sean -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
