Redistributable Package fix: High CPU usage when you run a Visual C++ 2010 application built together with the "/openmp" option enabled in Visual Studio 2010

Symptoms

Assume that you have a Visual C++ 2010 application that is developed in Microsoft Visual Studio 2010. The application uses the Open Multiprocessing (OpenMP) API to improve performance on a computer that has multiple processors. You build the application, and you use the /openmp compiler option. When you run the application, the application process might experience high CPU usage.

Note This issue does not occur in Microsoft Visual Studio 2008 or in Microsoft Visual Studio 2005.

Cause

This issue occurs because the implementation of the OpenMP runtime (Vcomp100.dll) has a spin-wait loop in which the OpenMP threads look for work for a short time before they are yielded.

Resolution

After you install the hotfix, you must create the OMP_WAIT_POLICY environment variable, and then set the value of the variable to PASSIVE.

Notes

  • If you set the value for OMP_WAIT_POLICY to ACTIVE, the OpenMP threads will spin-wait for a short time before blocking when the threads finish executing a workload.

  • If you set the value for OMP_WAIT_POLICY to PASSIVE, the OpenMP threads will immediately be blocked when the threads finish executing a workload.

  • The default value for OMP_WAIT_POLICY is ACTIVE.

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only 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 software update that contains this hotfix.

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

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

To apply this hotfix, you must have Visual Studio 2010 Service Pack 1 (SP1) installed.

Restart requirement

You must restart the computer after you install the hotfix if the affected files are being used during the installation.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global 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.

For all supported x86-based versions of Microsoft Visual C++ 2010 SP1 Redistributable Package

File name

File version

File size

Date

Time

Platform

Atl100.dll

10.0.40219.436

138,800

14-Dec-2012

06:35

x86

Mfc100.dll

10.0.40219.436

4,400,688

14-Dec-2012

06:35

x86

Mfc100chs.dll

10.0.40219.436

36,912

14-Dec-2012

06:35

x86

Mfc100cht.dll

10.0.40219.436

36,912

14-Dec-2012

06:35

x86

Mfc100deu.dll

10.0.40219.436

65,096

14-Dec-2012

06:35

x86

Mfc100enu.dll

10.0.40219.436

55,880

14-Dec-2012

06:35

x86

Mfc100esn.dll

10.0.40219.436

64,560

14-Dec-2012

06:35

x86

Mfc100fra.dll

10.0.40219.436

65,072

14-Dec-2012

06:35

x86

Mfc100ita.dll

10.0.40219.436

63,048

14-Dec-2012

06:35

x86

Mfc100jpn.dll

10.0.40219.436

44,592

14-Dec-2012

06:35

x86

Mfc100kor.dll

10.0.40219.436

44,104

14-Dec-2012

06:35

x86

Mfc100rus.dll

10.0.40219.436

61,512

14-Dec-2012

06:35

x86

Mfc100u.dll

10.0.40219.436

4,425,776

14-Dec-2012

06:35

x86

Mfcm100.dll

10.0.40219.436

82,496

14-Dec-2012

06:35

x86

Mfcm100u.dll

10.0.40219.436

82,496

14-Dec-2012

06:35

x86

Msvcp100.dll

10.0.40219.436

421,936

14-Dec-2012

06:35

x86

Msvcr100_clr0400.dll

10.0.40219.436

774,192

14-Dec-2012

06:35

x86

Vcomp100.dll

10.0.40219.436

52,288

14-Dec-2012

06:35

x86

For all supported x64-based versions of Microsoft Visual C++ 2010 SP1 Redistributable Package

File name

File version

File size

Date

Time

Platform

Atl100.dll

10.0.40219.436

159,280

14-Dec-2012

05:46

x64

Mfc100.dll

10.0.40219.436

5,579,824

14-Dec-2012

05:46

x64

Mfc100chs.dll

10.0.40219.436

36,912

14-Dec-2012

05:46

x64

Mfc100cht.dll

10.0.40219.436

36,936

14-Dec-2012

05:46

x64

Mfc100deu.dll

10.0.40219.436

65,072

14-Dec-2012

05:46

x64

Mfc100enu.dll

10.0.40219.436

55,880

14-Dec-2012

05:46

x64

Mfc100esn.dll

10.0.40219.436

64,560

14-Dec-2012

05:46

x64

Mfc100fra.dll

10.0.40219.436

65,096

14-Dec-2012

05:46

x64

Mfc100ita.dll

10.0.40219.436

63,024

14-Dec-2012

05:46

x64

Mfc100jpn.dll

10.0.40219.436

44,592

14-Dec-2012

05:46

x64

Mfc100kor.dll

10.0.40219.436

44,080

14-Dec-2012

05:46

x64

Mfc100rus.dll

10.0.40219.436

61,488

14-Dec-2012

05:46

x64

Mfc100u.dll

10.0.40219.436

5,605,952

14-Dec-2012

05:46

x64

Mfcm100.dll

10.0.40219.436

93,744

14-Dec-2012

05:46

x64

Mfcm100u.dll

10.0.40219.436

93,744

14-Dec-2012

05:46

x64

Msvcp100.dll

10.0.40219.436

608,816

14-Dec-2012

05:46

x64

Msvcr100_clr0400.dll

10.0.40219.436

830,016

14-Dec-2012

05:46

x64

Vcomp100.dll

10.0.40219.436

58,944

14-Dec-2012

05:46

x64

For all supported IA-64-based versions of Microsoft Visual C++ 2010 SP1 Redistributable Package

File name

File version

File size

Date

Time

Platform

Atl100.dll

10.0.40219.436

386,096

14-Dec-2012

06:07

IA-64

Msvcp100.dll

10.0.40219.436

967,232

14-Dec-2012

06:07

IA-64

Msvcr100_clr0400.dll

10.0.40219.436

1,500,224

14-Dec-2012

06:07

IA-64

Vcomp100.dll

10.0.40219.436

144,448

14-Dec-2012

06:07

IA-64

More Information

For more information about the OpenMP API in Visual Studio 2010, go to the following MSDN website:

General information about the OpenMP APIFor more information about OpenMP in Visual C++, go to the following MSDN website:

General information about OpenMP in Visual C++

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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