Intel® Fortran Compiler
Build applications that can scale for the future with optimized code designed for Intel® Xeon® and compatible processors.
29235 Discussions

Increased run time

ctica
Beginner
‎01-07-2003 11:06 PM
414 Views
My computer has an Intel Xeon processor running under Windows XP professional and with 2 GB of memory. I am using CVF V6.6b to compile and execute my Fortran program. There was no warning message. The run time took about 3 minutes. When the array sizes were quadrupled, I got a warning message at compilation - LNK4084 total image size 451485696 exceeds max (268435456), image may not run. This message was ignored. The program was executed for the same size problem as before i.e. the arrays are dimensioned much larger than necessary for the present problem. The results obtained are the same but the run time has been increased to about 6 minutes. Why has the run time doubled for the same size problem ? Can someone please enlighten me ? Thank you.
0 Kudos

Link Copied

1 Reply
Steven_L_Intel1
Employee
‎01-08-2003 01:46 AM
414 Views
My guess is that, due to the way you have the arrays declared, your data is actually scattered throughout the entire 450MB address space, and the memory accesses are a lot slower. Another possibility is that your system is low on physical RAM and that a lot more pagefile activity was happening.

Steve
0 Kudos
Copy link
Reply

Community support is provided Monday to Friday. Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.