[Beowulf] TCP connect error: ECONNREFUSED.

Jörg Saßmannshausen jorg.sassmannshausen at strath.ac.uk
Tue Mar 31 15:54:38 PDT 2009

Dear John and others,

first of all, I am reading the list now for some years and I gained quite a 
bit of knowledge here, so why shall I leave? Don't worry, I got no intention 
to do so.

I can see you point and I have already contacted the cluster support.
However, I have mixed experiences with support in the past. 
The last cluster I was working with was basically the hardware and the guys 
from out IT installed the OS on it. They probably had a hell of a time to do 
so, but the consequent clusters are easier to install (for them). As they 
don't know computational chemistry and I want to use the programs, we made 
the inofficial deal that I am dealing with the programs and they with the OS. 
So we both learned something and the system was running.

Things are different here and I slowly have to find my way around. To be 
honest, I stumbled over some severe missconfiguration, hence my trust in that 
company is not strong. Being upfront as I am, there is some substantial 
sloppy workmanship in the software installation and it already took me some 
days to iron out some of it. Even though the cluster grew over the last 
years, one certainly can do better. For that reason I was asking here for 
some new ideas how to tackle the problem and, to be honest, I am impressed by 
the feedback I got from here. 

I am on the GAMESS list as well and this error comes up there some times. 
Usually it is a misconfigured hosts file, sometimes firewalls as people are 
using machines connected to the WAN instead of a local, private LAN. I can 
rule that out.

I thought I reply in more detail to John's post to show that I am not offended 
and what motivations I had to post here.

All the best from Glasgow!


On Dienstag 31 März 2009 beowulf-request at beowulf.org wrote:
> 2009/3/31 John Hearns <hearnsj at googlemail.com>:
> > 2009/3/30 J?rg Sa?mannshausen <jorg.sassmannshausen at strath.ac.uk>:
> >> Dear all,
> >>
> >> I am having this rather anoying problem with the parallel execution of
> >> one of the programs (GAMESS US version) on our cluster. The error
> >> message is:
> >
> > As a general point - I have seen on several mailing lists folks asking
> > for specific help with a system.
> I got out on bed on the wrong side this morning.
> I do hope Jorg stays with the list - having expertise in computational
> chemistry will only add to
> the lists power.
> Maybe I should say things differently - your vendor's responsibility
> does not stop at hardware replacements.
> They often will go beyond their strictly contractual obligations and
> will diagnose problems with
> Linux kernel drivers, batch schedulers, application software etc. This
> is part of the "value add" which is why you (read your institution)
> went to a specialised cluster vendor, and not the lowest bidder.

Jörg Saßmannshausen
Research Fellow
University of Strathclyde
Department of Pure and Applied Chemistry
295 Cathedral St.
G1 1XL

email: jorg.sassmannshausen at strath.ac.uk
web: http://sassy.formativ.net

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