A large increase in memory usage occurs when you use the heapalloc function on a Windows XP-based computer (921321)



The information in this article applies to:

  • Microsoft Windows XP Professional
  • Microsoft Windows XP Home Edition

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 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 Windows XP 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 phone numbers and information about support costs, visit the following Microsoft Web site: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

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


Modification Type:MinorLast Reviewed:9/23/2006
Keywords:kbfix kbbug kbQFE kbhotfixserver kbpubtypekc KB921321 kbAudITPRO