Hi guys,
I meant to reply to this message from Jonathan on the forum.
(I havent checked the forums for a long while : my bad!)
And now, when I want to actually post this message, SF seems to be down
for maintenance!
So before I forget, I decided to post to the developers' list:
Jonathan,
This is in response to your message.
----------
1. What exactly _is_ economy based scheduling? Any links?
Economy based scheduling is allocation of a "resources", in this case
"Executors", to user's applications, in a market environment, where the
user specifies his QoS requirements such as deadline, budget etc... and
the resources themselves provide services at some cost. An economy-aware
/ economy-based scheduler would then take into account all this
information and determine optimal schedules for running the user's
application.
Links:
http://www.buyya.com/ecogrid/
http://www.buyya.com/thesis/
www.gridbus.org/broker
2. and 3. There were a few reasons why "cleaning the database" was
important to me:
* When Executors didn't connect because of some remoting issue (I don't
remember what it was right now, I'll have to check my email), I didn't
have any option except to delete the config file and regenerate an id.
So, there were multiple entries for the same machine name and no way to
fix that other than cleaning the database.
* When an application was terminated from the OS, as opposed to actually
completing execution, the threads were still being processed by the
executors, and the manager didn't know when to stop. Therefore, the grid
was completely useless since I couldn't run any new applications. Again,
the only viable solution was to clean the database.
--------------------------------
I understand. I think, a good solution would be, then to have an
archiving mechanism, so that Alchemi's database would store the
information used for "auditing" / keep past records in a seperate
database/set of tables. The current database would then be able to
function as a working RAM.
Krishna
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