A machinefile is a file that contains a list of the possible machines on which you want your MPI program to run. This file is useful if one of the Alphas is heavily loaded or is having problems. The particular machine you want to avoid can be commented out of the list of possible machines for selection. For example, jaguar is not possible for selection below.
For convenience, your machinefile should be kept in the same directory as your executable MPI files and named something appropriate like machines. The name of your machinefile will be used as an argument to the mpirun option -machinefile, (see next section).# sample machine file porsche.cis.udel.edu cobra.cis.udel.edu corvette.cis.udel.edu ferrari.cis.udel.edu # jaguar.cis.udel.edu lamborghini.cis.udel.edu lotus.cis.udel.edu maserati.cis.udel.edu viper.cis.udel.edu