I Guess I should comment on Jeff's comments too. On Thu, Sep 18, 2008 at 9:00 AM, Jeff Squyres <jsquy...@cisco.com> wrote: > On Sep 16, 2008, at 12:07 PM, Ethan Mallove wrote: > >> What happens if one uses --local-scratch, but leaves out the >> --scratch option? In this case, I think MTT should assume >> --scratch is the same as --local-scratch. > > In this case, my $0.02 is that it should be an error. --scratch implies a > --local-scatch, but I don't think the implication should go the other way.
Yeah, I agree, especially if we call it --mpi-install-scratch. >> Could the "local" in --local-scratch ever be misleading? >> Couldn't a user ever use a mounted filesystem that's faster >> than all their local filesystem? Should it be >> --fast-scratch? > > Mmm... good point. What if we name it what it really is: > --mpi-install-scratch? This also opens the door for other phase scratches > if we ever want them. And it keeps everything consistent and simple (from > the user's point of view). Ah, yeah, ok, now I see why you wouldl call it --mpi-install-scratch, so that it matches the MTT ini section name. Sure, that works for me. >> For future work, how about --scratch taking a (CSV?) list of >> scratch directories. MTT then does a quick check for which >> is the fastest filesystem (if such a check is >> possible/feasible), and proceeds accordingly. That is, doing >> everything it possible can in a fast scratch (builds, >> writing out metadata, etc.), and installing the MPI(s) into >> the slow mounted scratch. Would this be possible? > > Hmm. I'm not quite sure how that would work -- "fastest" is a hard thing to > determine. What is "fastest" at this moment may be "slowest" 2 minutes from > now, for example. Yeah, I claim that auto-detecting file system speed is outside the scope of MTT. :-) > I'm looking at the patch in detail now... sorry for the delay... > > -- > Jeff Squyres > Cisco Systems > > _______________________________________________ > mtt-users mailing list > mtt-us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/mtt-users > -- Tim Mattox, Ph.D. - http://homepage.mac.com/tmattox/ tmat...@gmail.com || timat...@open-mpi.org I'm a bright... http://www.the-brights.net/
