Microsoft KB Archive/893058

= FIX: You may experience frequent generation 2 garbage collection and high CPU usage by Aspnet_wp.exe on a computer that has the .NET Framework 1.0 SP3 installed =

Article ID: 893058

Article Last Modified on 6/1/2006

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APPLIES TO


 * Microsoft Common Language Runtime (included with the .NET Framework) 1.0

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For more information about how to resolve this problem on a computer that has the Microsoft .NET Framework 1.0 Service Pack 2 installed, click the following article number to view the article in the Microsoft Knowledge Base:

893222 FIX: You may experience frequent generation 2 garbage collection and high CPU usage by Aspnet_wp.exe on a computer that has the .NET Framework 1.0 Service Pack 2 installed





SYMPTOMS
You may experience frequent generation 2 garbage collection and high CPU usage by the Microsoft ASP.NET worker process (Aspnet_wp.exe). This problem occurs on a computer that has the Microsoft .NET Framework 1.0 Service Pack 3 (SP3) installed.

You may also notice that the ratio of garbage collections for each generation is much closer than expected.



CAUSE
This problem may occur when objects that are 85 kilobytes (KB) or larger are inserted into the large object heap. When objects that are 85 KB or larger are inserted into the large object heap, the common language runtime may not correctly manage the generation 2 heap and the large object heap.



RESOLUTION
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next .NET Framework 1.0 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

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

Prerequisites
You must have the Microsoft .NET Framework 1.0 SP3 installed to apply this hotfix.

Restart requirement
You must restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time      Version        Size       File name -  30-Jan-2005  00:47:24  1.0.3705.6032  1,998,848  Mscorlib.dll 28-Jan-2005 20:53:14  1.0.3705.6032  2,273,280  Mscorsvr.dll 28-Jan-2005 20:52:28  1.0.3705.6032  2,281,472  Mscorwks.dll



WORKAROUND
To work around this problem, use one of the following methods:
 * Minimize the size and the number of large objects that are used in the process.
 * Allocate large objects during the initial startup phase of the application.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
You can use Performance Monitor to view generation garbage collections. To view generation garbage collections, monitor the .NET CLR memory object and add the generation collection objects for Asp_wp.exe.

As a general guideline, there should be 10 generation 0 collections for each generation 1 collection. There should also be 10 generation 1 collections for each generation 2 collection.

This problem does not occur on computers that have the Microsoft .NET Framework 1.1 installed.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

