Q179456: Extensible Counters in Performance Monitor

Article: Q179456
Product(s): Microsoft Windows NT
Version(s): winnt:3.5,3.51,4.0
Operating System(s): 
Keyword(s): kbtool
Last Modified: 09-AUG-2001

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The information in this article applies to:

- Microsoft Windows NT Workstation versions 3.5, 3.51, 4.0 
- Microsoft Windows NT Server versions 3.5, 3.51, 4.0 
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SUMMARY
=======

Extensible counters are additions to the base Performance Monitor counters.
Programs like SQL and Exchange add extensible counters to Performance Monitor.
Custom counters can also be programmatically written and implemented into
Performance Monitor. For more information on writing extensible counters, see
Windows NT Resource Kit 3.51, Volume 4 chapter 13.


MORE INFORMATION
================

Extensible counter information is stored in both of the following places:

- HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\Current Version\Perflib\009

- %Systemroot\system32\Perfc009.dat and Perfh009.dat.

NOTE: All extensible counters are listed after number 1846 END MARKER.

The service that loads the extensible counter stores the information in the
following location:

HKEY_LOCAL_MACHINE\System\Currentcontrolset\Services\<service name>
\Performance

  where <service name> is the name of the service that is loading the
  extensible counters.

Under the Performance key, the significant values are:

FIRST COUNTER:
LAST COUNTER:
LIBRARY:

FIRST COUNTER:

The entry has a hex value. If we change this hex value to decimal it gives us the
location the extensible counters start in the Perfc009.dat file.

NOTE: This value only applies to the service that is loading the counter

LAST COUNTER:

The entry has a hex value. If we change the hex value to decimal it gives the
location in the .dat file of the last counter for this service.

LIBRARY:

This entry indicates which .dll file is being used to load the counters.

Additional query words: prodnt perfmon perf objects

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Keywords          : kbtool 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT351search kbWinNT350search kbWinNT400search kbWinNTW350 kbWinNTW350search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbWinNTS351 kbWinNTS350 kbWinNTS351search kbWinNTS350search
Version           : winnt:3.5,3.51,4.0
Hardware          : ALPHA x86
Issue type        : kbhowto kbinfo

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