[MPICH] unmanaged disconnection from mpd ring

[Jinyou Liang]

Dear friends,

I encountered a problem with mpd as described below, and would 
appreciate any insights that you may kindly offer to prevent similar 
problem.
Thanks in advance,
Paul

The problem:
 
Yesterday, I linked 8 dual processors together and mpdtrace output was:
chara
cha02
cha03
...
cha08.

I submitted a job that was supposed to finish during the night.

However, the job was still running (waiting) this morning, since 6 
processors were off the ring with the mpdtrace output as
chara
cha02.

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