Fluent: Instructions on Installing and Configuring MPICH

MPICH is a freely available, portable implementation of MPI, the standard for message-passing libraries. For more information on MPICH visit Argonne National Laboratories ( http://www.mcs.anl.gov/research/projects/mpich2/)

1.You must be logged on with Administrator privileges in order to install and configure MPICH (as well as start the MPD.exe process)
2.Download the self-extracting Windows version from Argonne National Laboratories. (DO NOT download the .src.exe file. You only need the .exe file, for example, mpich.nt.1.2.x.exe, where x is the latest revision number). Once downloaded double-click on the .exe file to install the software. MPICH must be installed on every computer in the cluster.
3.Set the MPI_HOME variable on every computer on the cluster.
¿Open up Control Panel, System, Advanced, Environment Variables.
¿Under User Variables or System Variables, click the New button.
¿In the Variable text box type: MPI_HOME
¿In the variable Value box type: C:Program FilesMPICHmpd
Note: The above value assumes you have installed MPICH in the default location.

MPIRegister.exe is a tool to encrypt an account and password into the registry for the current user. MPIRegister.exe can be found in the C:Program FilesMPICHmpdbin directory. A registry entry in HKEY_CURRENT_USERSoftwareMPICH will be created for the current user. If you have multiple users logging on to the system they also will have to register their account. If you don't register the account and password the error message: Mpd needs an account to launch processes" which will occur when you attempt to run FLUENT.

4.Open up a Command Prompt and browse to the C:Program FilesMPICHmpdbin directory.
5.Type: mpiregister.exe. This will prompt you to type in your user name and password. The user name and password required is the same as the one that you use to log on to Windows with (THEY MUST MATCH). You must register the user name and password on every computer in the cluster.
6.Choose (y) to this question. "Do you want this action to be persistent (y/n)?"

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