Date: Fri, 29 Jan 2016 12:12:53 -0500 From: japhar81 <japhar81@...il.com> To: john-users@...ts.openwall.com Subject: Re: MPI with Spot Instances? 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? On Wed, Jan 27, 2016 at 4:03 PM, magnum <john.magnum@...hmail.com> 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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