[MPICH] Doing collectives a better way in not-so-small nodes

[Mostapha Zbakh]

Hello,

I'm a new MPI user's; I try to run MPICH 1.2.7 but i can't do it.

There are some problems that i found. 

[root at localhost basic]# ../../bin/mpirun  -np 4 cpi
p0_2436:  p4_error: Path to program is invalid while 
starting /tmp/mpich-1.2.7p1/examples/basic/cpi with rsh on 
localhost.localdomain: -1
p4_error: latest msg from perror: No such file or directory
p0_2436:  p4_error: Child process exited while making connection to remote 
process on localhost.localdomain: 0
p0_2436: (6.036526) net_send: could not write to fd=4, errno = 32
p0_2436: (6.037920) net_send: could not write to fd=4, errno = 32

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[root at localhost root]# ssh -n localhost.localdomain date
root at localhost.localdomain's password:

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[root at localhost root]# rsh localhost.localdomain
connexion refused

I use the mpich1.2.7p1 version with ch_p4 device.
I execute some steps such tha: ./configue and make.  

Thank you for your help.

Mostapha