The first data point that is in a Performance Monitor log .csv file may be a larger number than expected on Windows Server 2003

Support for Windows Server 2003 ended on July 14, 2015

Microsoft ended support for Windows Server 2003 on July 14, 2015. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article has been archived. It is offered "as is" and will no longer be updated.
SYMPTOMS
You collect Performance Monitor data on a Windows Server 2003 machine. When the data is collected in the comma-separated value (.csv) format, the first data point that is collected may be a larger number than expected. This behavior occurs if the counter being monitored uses delta time, and if the log is set to start and to stop automatically. For example, the delta time is the %Processor Time time.
CAUSE
This issue occurs because the first data point is taken immediately.

When a log is stopped and then started automatically, the time between the last data point that is in the previous log and the first data point that is in the new log is very small. This behavior causes a very small divisor for the values that measure delta time. Therefore, the value of the resultant is larger than expected.

For example, the value of the resultant is as follows:
"date time","25.0000959987712157" <--- 25%, even though the CPU was idle
"date time","0.31377598366740811"
"date time","0.31377598366740811"
WORKAROUND
To work around this issue, do one of the following:
  • Collect data by using the binary (.blg) file format.
  • Ignore all data values that seem too large to be accurate.
Properties

Article ID: 983254 - Last Review: 12/12/2015 04:37:53 - Revision: 3.0

Microsoft Windows Server 2003, Datacenter Edition (32-bit x86), Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems, Microsoft Windows Server 2003, Datacenter x64 Edition, Microsoft Windows Server 2003, Enterprise x64 Edition, Microsoft Windows Server 2003, Enterprise Edition (32-bit x86), Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems, Microsoft Windows Server 2003, Standard x64 Edition, Microsoft Windows Server 2003, Standard Edition (32-bit x86)

  • kbnosurvey kbarchive kbtshoot kbexpertiseinter kbsurveynew kbprb KB983254
Feedback