Microsoft KB Archive/304921

= Cannot Open Large Windows NT 4.0 Performance Logs in Windows XP =

Article ID: 304921

Article Last Modified on 8/6/2002

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APPLIES TO


 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Professional

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This article was previously published under Q304921





SYMPTOMS
When you attempt to open a large Microsoft Windows NT 4.0 Performance Monitor log in Windows XP, System Monitor may display the following error message:

Data source  is invalid. It exceeds the size limit for System Monitor.



CAUSE
This behavior is caused by the virtual memory limitations of the x86 architecture, and by changes that have been made to System Monitor.



RESOLUTION
To work around this issue, use any of the following methods:
 * Use the Relog.exe command-line tool that is included with Windows XP to convert the log from Windows NT 4.0 binary format to .csv or .tsv format, and then open the log file in Windows XP. For information about using this tool, see the online Help in Windows XP.
 * Use the Microsoft Windows 2000 Perfmon4.exe Resource Kit tool to open the log file in Windows XP.
 * Load the log file on a Windows NT 4.0-based computer.



STATUS
This behavior is by design.



MORE INFORMATION
A sample command line for converting a Windows NT 4.0 log file to .csv format by using Relog.exe is:

relog logfile.log -f CSV

Additional query words: sysmon perfmon load

Keywords: kbnofix kbprb KB304921

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