[ogsa-wg] Teleconference minutes - 2 November 2005

[Hiro Kishimoto]

Thanks Ian for your feedback,

This is "a" sequence diagram not "the" diagram. I think in this
diagram, EMS expects to have one of scheduler (from your list) acts
as EPS.

We have not yet discussed how to find out and start talking to
appropriate scheduler. EMS should have flexible framework to allow
wide variety of schedulers. And also have a common interface and
protocol for interoperability and plugability.

Let's discuss these issues at the series of EMS calls.
----
Hiro Kishimoto

Ian Foster wrote:
> A more accurate answer would be that "Globus has lots of different 
> selectors", in that given the building blocks provided by MDS and GRAM, 
> one can build many different strategies (as was our intention), and 
> indeed people do just that . Thus, we see e.g.:
> 
> * Policy-driven schedulers that use published information about site 
> policies to determine where to send work (e.g., Dumitrescu).
> 
> * Performance-driven schedulers that use information about past 
> performance at different sites to determine where to send work.
> 
> * Load-driven schedulers that use information about current load at 
> different sites to determine where to send work.
> 
> * Reservation-based schedulers that use advance reservations. (This only 
> in research systems so far, due to lack of advance reservation support 
> in most production deployments.)
> 
> * Condor matchmaking
> 
> * Alternative matchmaking strategies based on extended ClassAd-like systems
> 
> * Schedulers that use information about data location to determine where 
> to send work.
> 
> * Coschedulers that use DUROC-like mechanisms to initiate computation 
> only on sites that turn out to be available.
> 
> I need to see more details on what is being proposed in terms of a 
> selector interface, but I would be concerned if there was an attempt to 
> incorporate this as a primitive. As the brief and far-from-comprehensive 
> list above shows, there are many different resource selection strategies 
> that may be applied, and these strategies may be applied in many 
> different ways and in different places.
> 
> Ian.
> 
> 
> At 06:37 PM 11/4/2005 +0900, Andreas Savva wrote:
> 
>>   - Other existing work on preferences or selection policy?
>>     - EGEE uses Condor classads (with EGEE extensions)
>>     - Globus (no, since no there is no scheduler)
> 
> 
> _______________________________________________________________
> Ian Foster                    www.mcs.anl.gov/~foster
> Math & Computer Science Div.  Dept of Computer Science
> Argonne National Laboratory   The University of Chicago
> Argonne, IL 60439, U.S.A.     Chicago, IL 60637, U.S.A.
> Tel: 630 252 4619             Fax: 630 252 1997
>         Globus Alliance, www.globus.org
>