Date: Sat, 30 Jan 2016 04:20:57 +0100 From: magnum <john.magnum@...hmail.com> To: john-users@...ts.openwall.com 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. magnum > 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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