CPU95 Timing Patch
For Use on Microsoft Operating Systems
Date: Fri Apr 21 13:05:32 EDT 2000
Timing information for measuring the runtime of the SPEC CPU95
benchmarks is obtained by reading the operating system's timer
and obtaining two items:
-
The total number of seconds
-
The fractional portion of seconds
On Microsoft operating systems, the SPEC CPU95 (Version
1.0 and 1.1) tools interpret the fractional portion of seconds as
microseconds when the value should be interpreted as milliseconds. SPEC has
released a patch to correct this problem.
Implications: The current interpretation by the SPEC CPU95
tools (Version 1.0 and 1.1) can lead to the reported time being, at most,
.998 seconds from the actual time, with an average approaching ~.5 seconds.
SPEC has checked and reprocessed all results submitted to SPEC on Microsoft
operating systems and has found ~1% or less variation in calculated results
for results submitted to SPEC as of April 1, 2000. SPEC is notifying
licensees of the availability of this patch and ensuring that submissions
for the SPEC website are processed with the fractional time interpreted
correctly.
Download the
patch!
Patch directions (requires SPEC CPU95 to be already
installed):
-
Set your directory to the top of your SPEC CPU95 directory tree
-
Set your SPEC environment variable
-
Unzip the patch file
-
Execute the file "patch1.bat"
