On Wed, Apr 06, 2011 at 08:31:53PM -0400, Stephen Dennis wrote:
Hi Chris
Thanks for pointing out this post.
I consider the man page sge_priorities to be the most important
document in grid engine. Its very good to see this post
discussing the topic.
I have been working on a way to visualize sge_priorities because,
well, there are so many knobs....
I wrote a script some time ago to parse various scheduler/ticket
configuration and dump it into a GrahpViz chart, suitable for printing
(I've still got it hanging over my desk). If there's interest, I can
try to find it and post it. It helped me figure out how everything
relates to everything else.
Also, something Daniel Templeton said in his SGE class is that trying to
predict the specific values from the scheduling systems (namely the
ticket policies) is both difficult, and of marginal use. It's more like
a "steering wheel" to guide policy, as opposed to strict direction.
Stephen
________________________________________
From: [email protected] [[email protected]] On Behalf Of
Chris Dagdigian [[email protected]]
Sent: Wednesday, April 06, 2011 6:15 PM
To: [email protected]
Subject: [gridengine users] great blog post w/ deep dive into SGE priority
calculations
Jiri forwarded me the URL to his post and I found it fascinating:
"Calculating GE Job Priorities"
http://olwynion.blogspot.com/2011/04/calculating-ge-job-priorities.html
I've always felt that one of the strengths of GE (unlimited number of
knobs that you can alter) is also one of it's biggest problems (infinite
number of potential configurations and no huge corpus of well tested
values ...) and this post reinforces a lot of those thoughts.
What do others think? I gave up years ago trying to understand the
policy mechanism at any deep level. I have a few good config recipes
that I stick with. Whenever I have to deviate from those, I often end up
making best-guess changes to odd SGE values/weights and then I have to
watch the pending/active job list to see if the resource allocation mix
is doing what I hoped. More clarity and "predictive-ness" would be welcome.
-dag
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Jesse Becker
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