RE: [condor-users] Some questions regarding Condor, Clustersand The Grid

["Heinz, Michael William" <michael_heinz@xxxxxxxxx>]

Chris,

I'm new to Condor as well, I'm researching various technologies for grid
computing and "cycle stealing" for my employer; but this is what I've
learned:

A lot of terms around clustering have multiple meanings. "Cluster" usually
means a group of tightly coupled, dedicated CPUs (for example, a "Beowulf
cluster"). Think of a cluster as being similar to a multi-cpu computer. 

In Condor terms, however, a "cluster" means a group of related jobs.

A "grid", broadly speaking is like a cluster where the individual machines
are only very loosely coupled and are used for many purposes, not just to
run cluster applications. Conceptually, a grid is like a very large cluster
with very high latency between nodes.

Condor looks like a great tool for distributed computing, but the standards
for grid computing offer a lot more services than just cpu time. Globus is a
"full" grid computing package but I haven't gotten a good handle on it yet.

I'm not sure what you mean about not wanting to make services available to
remote users. Condor can be installed so that only one machine is allowed to
submit jobs to the nodes. Globus seems to be the same way.

-----Original Message-----
From: Chris Miles [mailto:chrismiles1981@xxxxxxxxxxx] 
Sent: Wednesday, October 15, 2003 10:34 PM
To: condor-users@xxxxxxxxxxx
Subject: [condor-users] Some questions regarding Condor, Clusters and The
Grid


Clusters are a pool of computers that can be used for job submission yes? Im
unsure about what The Grid means everyone seems to have their own definition
and idea? Is The Grid to enable resources to be accessed by remote users ?

I have condor installed on windows and im submitting jobs fine.

Now what my task to do on "The Grid" is for some CPU intensive data
processing to be carried out on behalf of a remote user. All the remote use
has is their dataset in a text file. This data processing is the 
resource
that i want to make available.. I do not wish my cluster to be made
available - only to be used internally for the processing..

Does anyone have any pointers on what I need to do?

Im guessing Condor-G and Globus but from what i have understood from the
things i have read is that these make the cluster available to remote users
to run jobs which is not what i want.

thanks in advance

Chris, Paisley University, Scotland

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