 | | | Speed differences between RH8 and Winblows? | Speed differences between RH8 and Winblows? 2004-01-13 - By Sean Estabrooks
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On Tue, 13 Jan 2004 08:54:30 -0000
"Cannon, Andrew " <Andrew.Cannon@(protected) > 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
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