home *** CD-ROM | disk | FTP | other *** search
- DOCUMENT:Q110954 04-FEB-1994 [W_NT]
- TITLE :Performance Monitor CPU Utilization May Be Incorrect
- PRODUCT :Windows NT
- PROD/VER:3.10
- OPER/SYS:WINDOWS
- KEYWORDS:
-
- --------------------------------------------------------------------------
- The information in this article applies to:
-
- - Microsoft Windows NT operating system version 3.1
- - Microsoft Windows NT Advanced Server version 3.1
- --------------------------------------------------------------------------
-
- SUMMARY
- =======
-
- Performance Monitor does not correctly calculate CPU Idle time for 16-bit
- applications.
-
- MORE INFORMATION
- ================
-
- When you monitor the Percent Total Processor Time counter under the System
- object in Performance Monitor and a 16-bit application is the current
- window, Performance Monitor incorrectly reports processor usage at 100
- percent.
-
- The documentation for Performance Monitor says that Percent Total Processor
- Time is the average percentage of time that all the processors on the
- system are busy executing non-idle threads. When a 16-bit application is
- the current window, however, this counter totals the busy and idle time
- together, which makes the results almost meaningless.
-
- Steps to Reproduce Problem
- --------------------------
-
- (NOTE: This test requires the QSLICE.EXE program from the Windows NT
- Resource Kit. You can also reproduce this problem by using Performance
- Monitor and adding the Percent Total Processor Time counter under the
- System object.)
-
- 1. Start QSLICE and WRITE, arranging both windows so that they are visible
- on the screen at the same time.
-
- 2. Monitor the NTVDM.EXE entry in QSLICE. If you do nothing in WRITE, this
- counter shows little or no processor activity.
-
- 3. Type some text into WRITE and notice that the CPU utilization for NTVDM
- jumps upwards.
-
- This CPU utilization stays high until you move the focus away from WRITE.
- Even if you do not type anything, and WRITE is essentially idle, this
- utilization stays high. This is incorrect.
-
- Microsoft has confirmed this to be a problem in Windows NT and Windows
- NT Advanced Server version 3.1. We are researching this problem and
- will post new information here in the Microsoft Knowledge Base as it
- becomes available.
-
- Additional reference words: 3.10 perfmon
- KBCategory:
- KBSubCategory: 32ap
-
-
- =============================================================================
-
- 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 1994.