Microsoft Message Passing Interface (MPI) decreases in performance after you install HPC Pack 2008 Service Pack 1 (SP1) on a computer that uses some Nehalem processors.


Update information

How to obtain this update

To download this update, visit the following Microsoft website: download this update from the Microsoft Download Center, visit the following Microsoft website:
Download Download the update package now.
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services
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To apply this update, you must be running Windows HPC Server 2008. Additionally, HPC Pack 2008 Service Pack 1 (SP1) must be installed.

Installation instructions

To apply this update, run this update on the head node.

Note If you have a pair of high availability head nodes, run this update on the active node and then on the passive node.

Restart requirement

You may have to restart the computer after you install this update.

Update replacement information

This update does not replace a previously released update.


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

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