I have one question I hope you can help me with; Can I control the
xgrid controller? I want to implement a certain scheduling algorithm
to test a specific scheduling schema, can I do this with xgrid? I
would really appreciate any help.
There is no official way to control the scheduling directly at the
level of the controller.
However, you can certainly control things at the client level. First
by using job and task dependencies (wait for a specific job or task to
finish before starting another specific one) that can be set up in the
job specifications (man xgrid); no programming skills required.
Second, by using the APIs, you have even more flexibility, and can do
pretty much anything you like; some shell scripting or Cocoa
programming required. For instance, this is what GridStuffer does,
using the 'MetaJob' object as the scheduler.
The main limitation is you can't force a particular task to a specific
agent. Another limitation is that you may not be the only client, so
your scheduling may have to take into account that other clients may
connect to the controller at the same time, and also do whatever they
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