how to configure the mpi ?

[zou guangxian]

Hi,
  some body wrote that the beowulf cluster should configure some secury 
option so that the user can log in anther node withou password.but i have 
some doubt that whether these changes are needed by run a mpi program?that 
is to say,if the user want to run a program based mpi,he should change rsh 
file or other option so he can visit nodes without password?whether it is 
nessary?
thanks.
  your
    weck 

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