Do you think it is very important to have a stripped down kernel? Do you think having a kernel with more stuff compiled in causes more noise/longer runtime?
I would think that with the Ubuntu kernels having most of their options as modules, it shouldn't really be that much of an issue, right? On Fri, Mar 30, 2012 at 10:55 AM, avadh patel <[email protected]> wrote: > Does anyone thinks that it will be useful to have a latest Ubuntu disk > images? > I have a local 11.10 (natty) disk image that i built recently but it > doesn't have stripped down kernel image. > > Let me know if people are interested in it or not. > > - Avadh > > On Wed, Mar 28, 2012 at 11:22 AM, Paul Rosenfeld <[email protected]>wrote: > >> 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 >>> >> >> >> _______________________________________________ >> http://www.marss86.org >> Marss86-Devel mailing list >> [email protected] >> https://www.cs.binghamton.edu/mailman/listinfo/marss86-devel >> >> >
_______________________________________________ http://www.marss86.org Marss86-Devel mailing list [email protected] https://www.cs.binghamton.edu/mailman/listinfo/marss86-devel
