[Beowulf] Re: scyld and jaguar

Michael Will mwill at penguincomputing.com
Mon Mar 22 17:01:31 EST 2004

The problem is that a statically linked executable will not be able to use the 
Scyld infrastructure.  It won't take advantage of your Infinidband or 
Myrinet, it won't use bproc, etcpp.

You might set up the compute nodes to look like general unix nodes in order to 
run that particular implementation, but then you loose all the advantages of 
> I also worked on Alan's suggestion and created a
> dynamic link between the ssh and rsh. 
AFAIK you would be better off to set the enviroment variable to force it to 
use rsh or ssh. I think its  P4_RSHCOMMAND="ssh" .

The best way would be to ask your vendor to provide you with a dymanically 
linked executable, or even the source code and compile it yourself.

> I am now stuck 
> in making ssh passwordless. Using 'ssh-keygen -t' I
> generated public and private keys and then copied
> public key to the authorised_keys2 in ~/.ssh/. I am
> not sure if thats all I need to make ssh passwordless.
Does it work with localhost? It sometimes is tricky to get it right. 
then it could also work remotely, given that you 
1) have sshd running 
2) have your home NFS mounted
3) have made /dev/random accessible, at least for ssh I believe thats 

> I was wondering if I will have to copy public keys on
> each node using bpcp command.
You could do that too if you do not want to NFS mount the home. 

That you could easily do by editing /etc/exports to export /home 
and /etc/beowulf/fstab to mount $MASTER, after that rebooting your compute 
node. (might be possible without rebooting, but I don't know off of the top 
of my head)

Michael Will, Linux Sales Engineer
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