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Subject: Re: [OMPI users] spin-wait backoff
From: Douglas Guptill (douglas.guptill_at_[hidden])
Date: 2010-09-02 21:46:27


Hi David:

On Fri, Sep 03, 2010 at 10:50:02AM +1000, David Singleton wrote:
>
> I'm sure this has been discussed before but having watched hundreds of
> thousands of cpuhrs being wasted by difficult-to-detect hung jobs, I'd
> be keen to know why there isn't some sort of "spin-wait backoff" option.
> For example, a way to specify spin-wait for x seconds/cycles/iterations
> then backoff to lighter and lighter cpu usage. At least that way, hung
> jobs would become self-evident.
>
> Maybe there is already some way of doing this?

For my solution to this, see
 
  http://www.open-mpi.org/community/lists/users/2010/07/13731.php

HTH,
Douglas.

-- 
  Douglas Guptill                       voice: 902-461-9749
  Research Assistant, LSC 4640          email: douglas.guptill_at_[hidden]
  Oceanography Department               fax:   902-494-3877
  Dalhousie University
  Halifax, NS, B3H 4J1, Canada