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.
How to obtain this updateTo download this update, visit the following Microsoft website:
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 servicesMicrosoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
PrerequisitesTo apply this update, you must be running Windows HPC Server 2008. Additionally, HPC Pack 2008 Service Pack 1 (SP1) must be installed.
Installation instructionsTo 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 requirementYou may have to restart the computer after you install this update.
Update replacement informationThis 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.