Hydra supports a bunch of daemon processes, including ssh.  There is a daemon process included with MPICH called "persist", which you could use for this purpose, but it's not really maintained.  You could try it.

  -- Pavan

From: unix haha
Reply-To: "devel@mpich.org"
Date: Tuesday, June 30, 2015 at 6:18 PM
To: "devel@mpich.org"
Subject: [mpich-devel] about MPI hydra process management

Hi, all:

     I'm working on port the MPICH2 3.1.4 to an embedded environment. I met some problems for hydra process management, Could anyone help me?

     1. For the old MPD, before the mpirun, there's a daemon process running on all computer nodes. But I don't see what's hydra's daemon process in the current MPI document. Could you give me some hints?

      2. As we run the MPICH2 in a resource constraint environment, the SSH or the other linux-based launcher may not be used. Does it exist any simple launcher running on the computer nodes before the mpiexec?

      3. What's my understanding for hydra is: once the Launcher process running on all computer nodes, I can use the mpiexec on the control node to start the parallel jobs? If so, the problem is: Could I start the Launcher process manually if there's no linux-based launcher?

      Thanks!

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