Very slow runtime

Deleted_U_Intel · ‎10-23-2003

I have a Fortran progam that runs on Unix (HP-UX & IRIX) and now I am porting it to Windows. The program is a Fortran Console Application, made in Compaq Visual Fortran 6.5.
Running this application on an old 500 MHz Pentium II machine with Windows 98 takes about 15 seconds. Running the same app on Windows XP 1.8 GHz Pentium IV takes more than 2 minutes. The app is generating a lot of disk I/O.

Any idea what can be the reason for this?

Steven_L_Intel1 · ‎10-23-2003

Sounds like pagefile thrashing to me. How much RAM is on this new system? How much free disk space on the boot disk?

Steve

Deleted_U_Intel · ‎10-27-2003

Machine has 256 MB RAM. Free space on boot disk is appr. 3 GB.
Monitoring the job with the Task Manager shows that the System cache slowly increases.

Deleted_U_Intel · ‎10-27-2003

I found the cause of the problem. In the application a call is made to the routine FLUSH() It flushes a log file, so you can follow the progress of the calculation. Removing the call solved the problem.

Steven_L_Intel1 · ‎10-27-2003

Glad to hear it.

Steve