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

Support for Windows XP has ended

Microsoft ended support for Windows XP on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article has been archived. It is offered "as is" and will no longer be updated.
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.
Resolution

Hotfix information

A supported hotfix is 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 software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

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.
File nameFile versionFile sizeDateTimePlatform
Ntdll.dll5.1.2600.2932706,04817-Jun-200607:18x86
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
Properties

Article ID: 921321 - Last Review: 01/16/2015 09:21:11 - Revision: 4.0

  • Microsoft Windows XP Professional
  • Microsoft Windows XP Home Edition
  • kbnosurvey kbarchive kbautohotfix kbfix kbbug kbHotfixServer kbqfe KB921321
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