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Written by Autodesk
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Product(s) |
Release(s) |
Platform(s) |
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AutoCAD |
R13 |
WinNT 3.51 & 4.0 |
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Audience: |
For Public Distribution - Global | |
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Keywords: |
JUMPY LAGGING CROSSHAIR SLOW SYSTEM PERFORMANCE 1346 | |
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Related documents: |
None | |
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Document: DE-HB-TD101346.DOC |
Revision: 1.4 |
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Creation date: October 4, 1996 |
Date last revised: November 13, 1996 |
Expiry/review date: November 13, 1998 |
The tips, tricks, examples and suggestions outlined in Autodesk Product Support technical documents are suggested for use at your own risk. Document contents are subject to change without notice. Autodesk is not responsible or liable for damage or events that may occur as a result of following suggestions from any Autodesk Product Support technical document.
Overview
The performance of AutoCAD Release 13 under Windows NT 3.5x and 4.0 may be impaired, after closing multiple sessions of AutoCAD, if AutoCAD is configured for a digitizer rather than the system pointing device.
This performance degradation occurs because Windows NT does not remove all AutoCAD processes from memory after multiple sessions are closed. Therefore, less memory is available for remaining or subsequent AutoCAD sessions. As a result, AutoCAD slows down noticeably when using commands or moving the digitizer puck. Performance problems are usually noticed when the crosshairs do not move in sync with the digitizer puck. This phenomenon is commonly referred to as "jumpy crosshairs".
Note: This problem does not occur if R13 is configured for the System Pointing device
Checking Memory for Open Processes
You can see which AutoCAD processes remain in memory in NT 3.51 by using the Performance Monitor. To do this, run multiple sessions of AutoCAD and then close each one. In NT, select System Monitor in Administrative Tools. Select Edit from the pull-down menu and click on "Add to Chart". From the Object pull-down menu, select "View a Process". You should see acad and acadapp as processes.
Removing Open Processes from Memory
The following lists four ways to remove open AutoCAD processes from memory.
Warning: Do not remove AutoCAD processes from memory while an AutoCAD session is open. Doing so may result in losing drawing data. Also, do not remove Windows NT system processes because this will cause the computer to lock up.
• Close all running applications and logoff Windows NT. During logoff or shutting down NT, the "process is still running..." error will occur. Login NT and start AutoCAD.
• Use a Process View program such as pview.exe from Microsoft VC++. This tool shows all open processes and removes them from memory.
• The NT 3.51 Resource Kit has another process view program called, pviewer.exe. It allows you to see all running processes. The program can be used to remove or "kill" AutoCAD processes that have not been "closed" when AutoCAD is exited.
• Use the sample utility digifix.zip, provided by Autodesk. See the last section in this document for information about obtaining this file.
• If using Windows NT 4.0, you can remove remaining processes with the Security Tool. The following steps explain how to use this tool:
1. Start Windows NT Security while simultaneously pressing the <CRL+ALT+DEL> keys.
2. Click on the Task Manager button.
3. Choose the Processes card.
4. Select the process you want removed; select acad or acadapp in this example.
5. Press the End Process button.
Obtaining digifix.zip
You can obtain this utility from the following sources:
• World Wide Web: http//www.autodesk.com/support/updates/updates.htm
• Autodesk ftp site: ftp.autodesk.com/pub/autocad/
• CompuServe’s GO ACAD Forum
Note: Use pkunzip.exe to unzip the utility. After unzipping, refer to the file how2use.txt for instructions.
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