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Q255054: COM+ Does Not Reach SetMaxThreads for the Package

Article: Q255054
Product(s): Internet Information Server
Version(s): winnt:5.0; :
Operating System(s): 
Keyword(s): kbOSWin2000 kbThread kbDSupport kbiis500 kbWin2000PreSP1Fix
Last Modified: 08-MAY-2002

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The information in this article applies to:

- Microsoft Internet Information Services version 5.0 
- Microsoft Windows 2000 Professional 
- Microsoft Windows 2000 Server 
- Microsoft Windows 2000 Advanced Server 
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SYMPTOMS
========


An application, such as ASP in Internet Information Services (IIS) 5.0, that uses
COM+ to manage a thread pool may experience poor performance because COM+ does
not increase the thread count in the pool. Under normal conditions, COM+
increases the threads in the thread pool up to the maximum thread limit set by
the SetMaxThreads method for the package. However, if the initial worker threads
in the pool are too busy, then this issue may occur.

For example, when the ASP work load on an IIS 5.0 computer increases so that each
worker thread uses up a considerable amount of time to complete each request,
COM+ may never create any more threads even though the work in the shared queue
is always increasing, which in this case, causes ASP queuing to occur. This
problem can be identified by monitoring CPU usage. This problem will show up
when CPU utilization by Inetinfo is very low, usually on long blocking calls.

CAUSE
=====

Under heavy load, it is possible that the thread pool monitoring thread is not
spin up. When this happens, additional threads are not added as needed. The
thread pool monitoring thread must always be active.


RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Windows 2000. For
additional information, please see the following article in the Microsoft
Knowledge Base:

  Q260910 How to Obtain the Latest Windows 2000 Service Pack

A supported fix is now available from Microsoft, but it is only intended to
correct the problem described in this article and should be applied only to
systems experiencing this specific problem.

To resolve this problem immediately, download the fix as instructed below or
contact Microsoft Product Support Services to obtain the fix. For a complete
list of Microsoft Product Support Services phone numbers and information on
support costs, please go to the following address on the World Wide Web:

  http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are normally incurred for support calls may
be canceled, if a Microsoft Support Professional determines that a specific
update will resolve your problem. Normal support costs will apply to additional
support questions and issues that do not qualify for the specific update in
question.


The following files are available for download from the Microsoft Download
Center:

  US English
  Download Q262259_w2k_sp1_x86_en.exe now
  (http://download.microsoft.com/download/win2000srv/Patch/Q262259/NT5/EN-
  US/Q262259_W2K_SP1_X86_EN.EXE)

  French
  Download Q262259_w2k_sp1_x86_fr.exe now
  (http://download.microsoft.com/download/win2000srv/Patch/Q262259/NT5/FR/Q2
  62259_W2K_SP1_X86_FR.EXE)

  German
  Download Q262259_w2k_sp1_x86_de.exe now
  (http://download.microsoft.com/download/win2000srv/Patch/Q262259/NT5/DE/Q2
  62259_W2K_SP1_X86_DE.EXE)

  Italian
  Download Q262259_w2k_sp1_x86_it.exe now
  (http://download.microsoft.com/download/win2000srv/Patch/Q262259/NT5/IT/Q2
  62259_W2K_SP1_X86_IT.EXE)

  Japanese
  Download Q262259_w2k_sp1_x86_ja.exe now
  (http://download.microsoft.com/download/win2000srv/Patch/Q262259/NT5/JA/Q2
  62259_W2K_SP1_X86_JA.EXE)

  Spanish
  Download Q262259_w2k_sp1_x86_es.exe now
  (http://download.microsoft.com/download/win2000srv/Patch/Q262259/NT5/ES/Q2
  62259_W2K_SP1_X86_ES.EXE)

For additional information about how to download Microsoft Support files, click
the article number below to view the article in the Microsoft Knowledge Base:

  Q119591 How to Obtain Microsoft Support Files from Online Services

Microsoft used the most current virus detection software available on the date of
posting to scan this file for viruses. After it is posted, the file is housed on
secure servers that prevent any unauthorized changes to the file.


STATUS
======

Microsoft has confirmed this to be a problem in the Microsoft products that are
listed at the beginning of this article.

This problem was first corrected in Windows 2000 Service Pack 1.

Additional query words: COM+ Thread Pool

======================================================================
Keywords          : kbOSWin2000 kbThread kbDSupport kbiis500 kbWin2000PreSP1Fix 
Technology        : kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000Serv kbwin2000ServSearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbiisSearch kbiis500 kbWinAdvServSearch
Version           : winnt:5.0; :
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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