use dclock and get negative run time

use dclock and get negative run time

Hi, everyone!

I'm using "dclock" (with "use ifport") for the timing of my application. It works well for a short run, i.e. 300 seconds. But for a long run, i.e. 1 or 2 days, it gives a negative time. Could anyone give an explanation?

Thanks!

CPU: Intel Core 2 Duo 2.4 GHz
OS: Mac OS X 10.5.8
Linux: Debian 5.0 x86_64
Compiler: Intel Fortran Compiler 11.1 & Intel C++ Compiler 11.1 (with Intel MKL included)
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