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Date: Sat, 30 Jan 2016 04:20:57 +0100
From: magnum <>
Subject: Re: MPI with Spot Instances?

On 2016-01-29 18:12, japhar81 wrote:
> Ok, so corollary question -- does the session stuff work with MPI? i.e.
> lets say I start the spot instances externally, and mpiexec jtr with some
> flavor of --session (on a box that wont die). If those nodes die
> mid-process, will that be recorded in the session to enable a resume later
> when I spin new nodes and start mpiexec again?

Sure (as far as I can imagine how spot instances work). Session file 
integrity is very well tested.


> On Wed, Jan 27, 2016 at 4:03 PM, magnum <> wrote:
>> On 2016-01-27 17:25, japhar81 wrote:
>>> I've been playing around with MPI clustering JtR for a while, and I've
>>> managed to get it running smoothly on static nodes. What I'd like to do
>>> next is create an auto-scaling group in AWS, using spot instances. What
>>> this basically means is nodes will come and go, with their hostnames/IPs
>>> changing at random.. I can not figure out how I would run JtR in that
>>> instance -- since it requires a node list in a file on startup to mpirun.
>>> If it matters, I'm looking to do a brute-force using the ASCII mode. Has
>>> anyone found a way to do a dynamic cluster that adds/removes nodes at
>>> random? Is this even possible?
>> I'm not aware of any existing work that would do this. A solution using
>> JtR as-is, but with some yet-to-be-implemented master issuing jobs, could
>> involve looking at the existing "-node=x/y" as describing "pieces" instead
>> of "nodes". So instead of saying -node=2/8 as in "you are node 2 of 8"
>> you'd say -node=4321/100000 as in "do piece 4321 of 100000". Then you'd
>> submit pieces to active nodes. Obviously you'd have to handle dying nodes
>> that never reported back their given piece, and re-issue those pieces.
>> magnum

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