Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Open MPI User's mailing list

Subject: Re: [OMPI users] Is OpenMPI's orted = MPICH2's smpd?
From: Ashley Pittman (ashley_at_[hidden])
Date: 2009-12-22 07:35:14


On Tue, 2009-12-22 at 09:59 +0530, Sangamesh B wrote:
> Hi,
>
> MPICh2 has different process managers: MPD, SMPD, GFORKER etc.

It also has Hydra.

> Is the Open MPI's startup daemon orted similar to MPICH2's smpd? Or
> something else?

My understand is that SMPD is for launching on Windows which isn't
something I know about.

orte is similar to MPD although without the requirement that you start
the ring before-hand.

A quick summary of orte: Orte takes a list of nodes and a process count,
given these it will start a job of the given size on the given nodes.
No prior configuration or starting of deamons is required. No effort is
made to prevent multiple jobs from starting on the same nodes and no
effort is made to maintain a "queue" of jobs waiting for nodes to become
free. Each job is independent, and runs where you tell it to
immediately.

Ashley,

-- 
Ashley Pittman, Bath, UK.
Padb - A parallel job inspection tool for cluster computing
http://padb.pittman.org.uk