similar to: openMosix vs SNOW: redhat kernel causing slowdown?

Hi there, We're attempting to run an LVQ analysis over a cluster of machines via R and openMosix. R spawns several child processes simply by writing commands to several files and using system() to start a slave process. The processes migrate perfectly, and often finish with no reported errors, writing their results into respective files for the parent process to piece together.

Hi all, I was hoping to get some advice about a problem that I realize will be difficult to reproduce for some people. I'm running R 1.7.1 on an openMosix (Linux) cluster and have been experiencing some odd slow-downs. If anyone has experience with such a setup (or a similar one) I'd appreciate any help. Here's a simplified version of the problem. I'm trying to run the

It's generally said that OM needs lots more swap than plain Linux. There has to be someplace to juggle processes around. We use 4 GB nodes with something like 12 GB swap; that plus round-robin logins to distribute home nodes seemed to solve a lot of our problems. To use oMFS to allow processes to write from the node they've migrated to you also need DFSA enabled. That sounds like a great

Memory could be an issue. The three nodes in the cluster we are using only have 512 MB. The machines are otherwise identical in terms of hardware. They are dual PIIIs (purchased from Penguin Computing in 2001). (If you need specs on motherboard etc, we can get that info together.) The installed operating system is RHEL-3, standard workstation with some additional libraries (e.g., all of the

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Apologies if this is the wrong place to post this question. In that event, please point me in the right direction. My question is whether or not I can use Xen with OpenMosix. The upshot of what I''m attempting to do is this: 1. Build a two to four node cluster using OpenMosix for "raw horsepower" 2. Use Xen on the OpenMosix cluster to divide the "raw horsepower" any

Hi all !!! I have got a MOSIX-Cluster and wanted to upgrade to ext3-fs, but that didn't work out. The ext3-fs patch FAILED to patch the MOSIX-kernel and if I tried to apply the ext3- patch before, the MOSIX-patch failed. Can someone help me with that ? Perhaps someone knows of a conclusion for that problem or can tell me where to get a MOSIX-patch for 2.4.15. I would be glad to hear from

Oops. Seems I only sent this to myself. T. -------------- next part -------------- An embedded message was scrubbed... From: "Timothy H. Keitt" <tklistaddr at keittlab.bio.sunysb.edu> Subject: Re: [R] Multithreading Date: 16 Apr 2002 12:34:52 -0400 Size: 2091 Url: https://stat.ethz.ch/pipermail/r-help/attachments/20020416/dd6c9385/attachment.mht

Mosix is a cluster operating system that is a set of kernel patches to Linux on i386 machines. It allows processes to migrate to other nodes on the cluster transparently. See www.mosix.org for details. However, my R processes were refusing to migrate. Using strace, and delving into the R code, I found that it was due to a large number of calls to the system setjmp and longjmp routines - the

Has anyone tried Asterisk on a MOSIX cluster? My concern is if there is any adiitonal laltency when when the processes are moved from on node to another. Anyone tried it yet? thaks, darran ps. Anyone have any info on MYSQL support with Asterisk? I see the conf file but I dont see a database schema to install... -------------- next part -------------- An HTML attachment was scrubbed...

Anyone have any experience running OpenMosix on CentOS 3? Are you using a kernel custom built or from somewhere? Any maintenance headaches wrt kernel updates? Thanks in advance. -Alan -- Alan Sparks, UNIX/Linux Systems Integration and Administration <asparks at doublesparks.net>

Hi, Has anyone used a 2.4 series kernel on RHEL4/Centos4? There's a patch (openmosix) which I would really like to make use of [seeing as I just got 10 diskless computers...] which is not ready (yet) for the 2.6 kernel series... Can I just drop in a 2.4.26 series kernel and continue to have a working system? Or is RHEL now totally dependent on 2.6 kernel features? Cheers, MaZe.

Barry, Would you mind providing the necessary patch for this behavior? Thanks, Greg > -----Original Message----- > From: Barry Rowlingson [mailto:B.Rowlingson@lancaster.ac.uk] > Sent: Monday, November 04, 2002 8:04 AM > To: r-devel@stat.math.ethz.ch > Subject: Re: longjmp - was: seemingly random "nesting of > readline input" > warnings > > > Luke

Dear FLAC User's Mailing List, I'm Miguel A. Mota Jr., Co-Founder and President of the Woodrow Wilson High School Science & Technology Club in Camden, New Jersey USA. With a few small grants from Lucent Technologies/Bell Labs, we have developed a parallel-processing Linux Cluster (6 nodes) based on Red Hat 7.3 (2.4.18 kernel ) and openMosix clustering technology. Its not much,

Dear all, I wrote the following batch script on a iMac, and ran it on a linux mosix cluster. tu <- read.table("cage.mm5.tags.rna_lib.CAA-CAJ.tu-reshape.table") tu_reshaped <- t(reshape(tu[1:50,], direction="wide", timevar="tu", idvar=c("rna","lib"))) write.table(tu_reshaped, "cage.mm5.tags.rna_lib.CAA-CAJ.tu-reshaped.table")

Hello fellow samba users, Our company uses samba for all fileshares/printing/PDC on two SUN E3500's. We like to replace these with about 10 Linux 19" XEON (pizza)boxes. The question: Are there any implementation out there using a loadbalancing cluster doing samba? A simple diagram of the setup I have in mind: Users (+/- 500) ||| Headnode(Director 1) - Headnode (Director 2) | Worknode -

When I try to install R-patched of January 26 on my linux (fedora core 1, with openmosix kernel) box, make fails in the first recommended package with the message tkStartGUI text html latex tkpager text html latex make[2]: Leaving directory `/home/setzer/newstuff/R-patched/src/library' make[2]: Entering directory

I recompiled my kernel to link in ltsp with open mosix. Now wen the client machine boots I keep geting the message: Can not load a ramdisk with an old kernel image Can you tell me why

NEWS for R 1.8.0 has >> USER-VISIBLE CHANGES >> >> <......> >> >> o On Unix-like systems interrupt signals now set a flag that is >> checked periodically rather than calling longjmp from the >> signal handler. This is analogous to the behavior on Windows. >> This reduces responsiveness to interrupts but prevents bugs

[Sorry for possible duplicated thread.] Hi. I''m new to Xen and I would know if it works well in a cluster environment (Beowulf, OpenMosix, CoLinux etc). I need an HPC running some virtual machines. Is this possible with Xen? Regards. -- Allysson Steve Mota Lacerda Administrador de Redes http://www.stevelacerda.net _______________________________________________ Xen-users mailing