Re: [Beowulf] SSH without login in nodes

On Sat, 5 May 2007, Peter St. John wrote: > I am configuring a cluster with ssh (but without passwords) and currently > the users can log in to compute nodes. I wish the clients to use the queue > system (Torque, it works fine) without being able to access the compute > nodes. In the past, we used

[Beowulf] MPI application benchmarks

Hi, this is partially triggered by the mentioniong of the SPEC MPI2007 benchmark: what are people using as a benchmark suite for RFP purposes? We will be purchasing a shared cluster for a wide community (currently more than 1000 users). Thus, the common response on this list to evaluate hardware

Re: [Beowulf] SSH without login in nodes

Hi, On Friday 04 May 2007 01:06:51 pm Peter St. John wrote: > There was a typogrphical error in the question. I had a brief exchange > with señor Gomez and he confirmed this translation: > > I am configuring a cluster with ssh (but without passwords) and > currently the users can log in to compute

Re: [Beowulf] SSH without login in nodes

There was a typogrphical error in the question. I had a brief exchange with señor Gomez and he confirmed this translation: I am configuring a cluster with ssh (but without passwords) and currently the users can log in to compute nodes. I wish the clients to use the queue system (Torque, it works

Re: [Beowulf] LVM performance problems

Judd Tracy wrote: > I am trying to bring up a small file server and am noticing some serious > performance issues when using LVM. I created a software raid /dev/md0 How many drives? Which raid level? What stripesize? What RAID controller? > which I can read at ~195MB/s using the raw raid devi

RE: [Beowulf] LVM performance problems

What model server is this? What level raid is the software raid volume, how many drives and what type? How did you exactly establish the performance number? I have done performance benchmarking with LVM over hardware raid luns had have not been able to show a significant performance degradation

Re: [Beowulf] Please help test compiler/hardware issue

Peter St. John wrote: I'm thinking this must not be what the subroutine ATOB does, maybe a call by reference instead of call by value confusion (to me). Yup. All Fortran calls are by reference. So the routine is just copying one section of A to another section of A. Should be fine as long

Re: [Beowulf] compiler/hardware issue fixed

Orion Poplawski wrote: So, I guess this points to a hardware issue, but it may be a somewhat generalized hardware issue. I'd love to hear reports on other (particularly other Tyan S2882 dual 244's) systems. I updated the BIOS on the 244's and the problem appears to have gone away. I should

[Beowulf] Re: fast file copying

Felix Rauch Valenti wrote: > On 03/05/07, Alan Louis Scheinine <[EMAIL PROTECTED]> wrote: > > One possibility is nettee. > > http://saf.bio.caltech.edu/nettee.html > > As a related side note: If the bandwidth you get is not what you > expect, it may well be that your switch is bad (or that your d

Re: [Beowulf] Please help test compiler/hardware issue

I don't understand what "allocatable" and "allocate" do. It would seem that atob writes an integer (assigned by a(i) = i) to an address which had also been specified by the a(i)=i assignment, and was not necessarily allocated to a. That would be expected to generate random errors, and since the ex

Re: [Beowulf] Syslog Server-Traffic

Thank you all for the input, it's been very helpful in making my clustering decisions. On 5/3/07, Mark Hahn <[EMAIL PROTECTED]> wrote: > I'm researching setting up a cluster and I'm curious as to whether or > not it's a good idea to set up a syslog server. The question I have depends on how m

Re: [Beowulf] fast file copying

I gave a talk where I referred to a "ring" boot mechanism for Warewulf using "Dolly". http://www.cs.inf.ethz.ch/CoPs/patagonia/dolly.html Thinking back now, I don't remember you being at that talk, so you are probably thinking of something else. ;) On Apr 30, 2007, at 11:35 AM, Geoff G

[Beowulf] LVM performance problems

I am trying to bring up a small file server and am noticing some serious performance issues when using LVM. I created a software raid /dev/md0 which I can read at ~195MB/s using the raw raid device, but as soon as I put LVM on top of it the read speeds drop to ~95MB/s using a raw lvm partition

[Beowulf] SSH without login in nodes

Hi, Im config a cluster with ssh password less, but the users can login into nodes. I want the clients, use de queue system (Torque, its works fine), without access into nodes. In the past, use rlogin, without rlogin. Thanks. ___ Beowulf mailing list

Re: [Beowulf] Please help test compiler/hardware issue

Hi Orion, I'm thinking you may have bad memory/hardware on one of those nodes here mate... Compiles and runs fine here in 32 bit ubuntu fiesty: [EMAIL PROTECTED]:~$ uname -a Linux harold 2.6.20-15-386 #2 Sun Apr 15 07:34:00 UTC 2007 i686 GNU/ Linux [EMAIL PROTECTED]:~$ cat /proc/cpuinfo

Re: [Beowulf] Syslog Server-Traffic

If you engineer the config well, you won't have any significant amount of "insignificant" traffic. Whether your situation is vulnerable to minute amounts of traffic and client-side processing of packets sent is site-specific. Using syslog-ng (or several other options), you can configure the

Re: [Beowulf] Problem while booting diskless node.

ok, I succeeded. Thanks to all for helpfull comments. -- Maxime Kinet Université Libre de Bruxelles Physique Statistique et Plasmas, CP 231 Campus Plaine - Boulevard du Triomphe, 1050 Bruxelles. Tel. : +32-2-650.59.08 e-mail : [EMAIL PROTECTED] On 01 May 2007, at 12:34, Panag

Re: [Beowulf] fast file copying

Geoff Galitz wrote: Hi folks, During an HPC talk some years ago, I recall someone mentioned a tool which can copy large datasets across a cluster using a ring topology. Perhaps someone here knows of this tool? Not sure about a ring topology, seems kinda silly... why not bit-torrent? It's o