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Re: [Condor-users] Resource Discovery Algorithm?

Anju--the whole idea of Resource Discovery is sort of a new
one in the Grid and Condor world and the term is still not well
defined.  It would help if we knew what it was you were trying to do.

The Open Science Grid, which is the main US Grid infrastructure,
does use Condor as a critical part of their Resource Selection Service.
Each of the 70-some sites on the Open Science Grid has a daemon
running called CEMon which takes the state of the cluster and
converts it into a condor classad. There is then a central collector/negotiator at which Open Science Grid users can point
their condor schedd and pick the site that meets their requirements.
This is the third or fourth system like this which uses Condor classads
to send whole-cluster information. The Canadian GridX1 and Fermilab's
FermiGrid and SAMGrid are doing very similar things.

There is another idea called resource discovery in some other grids
which is more limited in scope, which is only meant to let
people know where the resources are and not necessarily how many
slots they have or of what type they are, or even if they are up.
This is the approach used by the gLite software of EGEE the European
grid, and discussions have been under way in the Open Grid Forum
for almost a year now to extend that approach to all grids.

In the development branch of Condor there has been the idea of
"schedd-on-the-side" which can take a Vanilla universe job and
detect and find other condor pools where it could run.  I have not
tried this personally but those at Wisconsin and Lehigh (COR@L lab) who
have have reported good success.

Hope this helps. Google any of the terms I put in the above statement
and you can find a lot more.

Steve Timm

Steven C. Timm, Ph.D  (630) 840-8525
timm@xxxxxxxx  http://home.fnal.gov/~timm/
Fermilab Computing Division, Scientific Computing Facilities,
Grid Facilities Department, FermiGrid Services Group, Assistant Group Leader.

On Tue, 1 Jan 2008, anju sharma wrote:

Hi All,

 Can anybody help me, that which resource discovery algorithm condor is follows? And how it does the Resource Discovery?

 waiting for prompt reply.

 Thanks In Advance.........



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