Microsoft KB Archive/921321

= A large increase in memory usage occurs when you use the heapalloc function on a Windows XP-based computer =

Article ID: 921321

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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SYMPTOMS
On a Microsoft Windows XP-based computer, you build a user-mode application. During this process, you use the heapalloc function to allocate system memory resources. In this scenario, the heap manager uses doubling functionality to add new heap areas. However, when the heap reaches 256 megabytes (MB) of memory, this doubling functionality unexpectedly requires a new contiguous 512-MB block of memory.



Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

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

Prerequisites
No prerequisites are required.

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 item in Control Panel.

Note After you apply this hotfix, Windows XP uses a 50-percent growth rate instead of a 100-percent growth rate. This reduces the rate at which the heap grows when the heap exceeds 256 MB.



MORE INFORMATION
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

Keywords: kbfix kbbug kbhotfixserver kbqfe kbpubtypekc KB921321

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