Ah, good to know, Thanks. On Wed, Mar 28, 2012 at 1:08 PM, Tae Jun Ham <[email protected]> wrote:
> Hello, > > > For your information, I tried dist-upgrade, too; however, it also broke my > image (booting part). > > > Thanks > > > -Tae Jun Ham > > > -----Original Message----- > *From:* "Paul Rosenfeld"<[email protected]> > *To:* "marss86-devel"<[email protected]>; > *Cc:* > *Sent:* 2012-03-29 (목) 01:54:48 > *Subject:* [marss86-devel] SSH/RSH/OpenMPI: cautions and suggestions > > Greetings all, > > I have been doing some experimenting and I wanted to share what I've > learned so that in case anyone else finds this thread maybe I can save them > some time. Though it probably won't be that useful to that many people. > > What I've been doing is trying to get some MPI workloads running in marss > using the OpenMPI shared memory interfaces. Now, I know this sort of > defeats the spirit of MPI, but we have an interest in such workloads and > since I can't imagine setting up multiple marss instances with a network > between them to do *actual* message passing is very easy this is one avenue > to run multiple MPI ranks without multiple marss instances. > > I started with the parsec ROI image, converted it to a raw image and > chrooted the image so I could use apt-get and build stuff without the > slowdown of using qemu. > > 0. My initial attempt at simply apt-getting libopenmpi failed and I > thought it was due to an old binary so I built 1.4.5 from source. Though it > turns out the orte_init() error was because of missing ssh/rsh [see #3 > below], so it could be that you can simply apt-get install libopenmpi -- > though I did find some bug reports that the shared memory mode is broken in > 1.3.x, so use at your own peril. > 1. Due to the age of the ubuntu distro, you have to change the entries in > /etc/apt/sources.list to point to old-releases.ubuntu.com and then run an > apt-get update. > 2. Do not try to apt-get openssh-client, this will break your image. It > turns out openssh-client pulls in a few things like mountall and upstart > which confuse the boot process and your root partition won't mount. I > didn't investigate further about why this fails. Perhaps doing a full on > dist-upgrade to pull in new kernels and new libc would have fixed this, but > I didn't try it. > 3. OpenMPI requires either ssh or rsh for some reason even if you're using > the shared memory system and have no networked nodes. Since installing ssh > from apt-get breaks the boot process, you should install rsh-client -- it > pulls in no dependencies and it gets rid of the errors in orte_init() when > trying to run mpirun > 4. To enable the sm mode in MPI, issue the following command: mpirun -mca > btl self,sm -np 4 ./your_mpi_binary > > That's about it. > Happy simulating. > _______________________________________________ > http://www.marss86.org > Marss86-Devel mailing list > [email protected] > https://www.cs.binghamton.edu/mailman/listinfo/marss86-devel >
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