DOCUMENT:Q157044 08-AUG-2001 [winnt] TITLE :Some Applications Appear to Consume 100% of CPU Time PRODUCT :Microsoft Windows NT PROD/VER:winnt:4.0 OPER/SYS: KEYWORDS:kbnetwork ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation version 4.0 - Microsoft Windows NT Server version 4.0 ------------------------------------------------------------------------------- SUMMARY ======= Microsoft Windows NT allows users to monitor CPU usage through Task Manager and Performance Monitor. If these tools are used in Windows NT 4.0, some applications may appear to be consuming 100 percent of the CPU time, while Windows NT is waiting for other actions to occur. MORE INFORMATION ================ Windows NT 4.0 allows an application to consume all of the CPU time if no other thread is waiting for CPU time. As soon as another thread requests CPU time, regardless of the priority of that thread, Windows NT 4.0 yields control and CPU time will drop back to normal levels. The behavior described above is the result of a change made to the way in which Windows NT 4.0 manages CPU time. This behavior is by design and has no negative effect on Windows NT 4.0 or application performance. Additional query words: prodnt perfmon nt16ap ====================================================================== Keywords : kbnetwork Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 Version : winnt:4.0 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.