[SCore-users-jp] Re: [SCore-users] SCORE_RSH and use of ssh instead of rsh

[Bogdan Costescu]

On Thu, 27 Mar 2003, C. Evangelinos wrote:

> 1) removing the rpms leaves init scripts behind in /etc/rc.d as well
> as the new devices (the latter is not really a problem)

Indeed, the devices are not a problem. However, the scripts should be 
removed, but only if you did not modify them (= rpm -V still reports them 
as "original").

> 2) It would be nice to have a script that reproduces the effects of
> installing the rpms for setting up device and configuration scripts,
> local directories etc.

It exists. You probably didn't read the whole docs...

http://www.pccluster.org/score/dist/score/html/en/installation/sys-compute-fromsrc.html

and if you think the 4-5 commands that have to be executed are too much, 
then you can put them in a script.

> for the case of NFS installations like mine which do not use EIT or the
> RPMS for the compute nodes.

My install attempt few weeks ago was not on NFS, but was without the RPMs, 
so it's certainly possible if you follow these indications.

> 3) I got SCore to work fine (so far) on a system with a Realtek
> ethernet card (8139too driver).

I'm surprised that it worked at all !!! The Realtek cards (but not 
including the latest C+ variation driven by 8139cp driver which is a 
different chip) are not useful in anything that requires large amounts of 
communication - they need too much CPU intervention in performing any kind 
of network activity.

> kernel: eth0: Too much work at interrupt, IntrStatus=0x0001.

This is a typical message of system being too slow to process all the 
incoming packets. And the system can be slowed down a lot by even 
processing these packets !

> Performance between such a box and another one with an Intel eepro100
> driven card is so-and-so

You compare two different things: if you have eepro100 cards for the whole 
cluster, use them !

> Is there a quick fix for that or is rsh hardcoded in too many places in
> the source code?

Well, if you can get ssh to act like rsh (which is normally the case), 
then you can just rename ssh to rsh (or make a link or ...) and everything 
should just work.

-- 
Bogdan Costescu

IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen
Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY
Telephone: +49 6221 54 8869, Telefax: +49 6221 54 8868
E-mail: Bogdan.Costescu ＠ IWR.Uni-Heidelberg.De

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