DOCUMENT:Q176211 10-AUG-2001 [winnt] TITLE :Console-mode Apps May Run Slowly on Multiprocessor Computers PRODUCT :Microsoft Windows NT PROD/VER:WinNT:4.0 OPER/SYS: KEYWORDS:kb3rdparty kbWinNT400sp4fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation version 4.0 - Microsoft Windows NT Server version 4.0 - Microsoft Windows NT Server version 4.0, Terminal Server Edition ------------------------------------------------------------------------------- SYMPTOMS ======== A series of MS-DOS-based console applications may take a long time (perhaps several minutes) to complete on a multiprocessor computer. The console windows may remain blank and appear to stop responding (hang). All the applications do eventually finish, but this may take an unusual amount of time. The same series of applications will finish in a few seconds on a single processor computer. CAUSE ===== A console handle table lock is being held too long during the freeing of a console. Processing for other console-related activities is delayed while the lock is held. The problem is not usually seen on single processor computers as a context switch to another console process is unlikely during console cleanup. On a multiprocessor computer, however, multiple console-mode processes may be executing simultaneously, which greatly increases the chance of encountering this problem. RESOLUTION ========== To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, please see the following article in the Microsoft Knowledge Base: Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack This fix modifies console handling so that the handle table lock is released during noncritical sections of console cleanup. This allows other simultaneously executing console processes to continue and finish in a reasonable time frame. STATUS ====== Microsoft has confirmed this to be a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4. MORE INFORMATION ================ All MS-DOS console-mode applications are affected by this problem on multiprocessor computers under Windows NT 4.0. Windows applications are not affected. This problem has been seen when attempting to start multiple PERL scripts as CGI applications run in console-mode on multiprocessor intranet web servers. Additional query words: wedge msdos dos box cmd command multi-processor Ntvdm vdm mp ====================================================================== Keywords : kb3rdparty kbWinNT400sp4fix Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServSearch Version : WinNT:4.0 Hardware : ALPHA x86 Issue type : kbbug Solution Type : kbfix ============================================================================= 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.