July 2006 - saga-rg - lists.ogf.org

context problem
by Andre Merzky 14 Jul '06

14 Jul '06

Hi folx, I realised that we are running into some problems with our current session and context handling. For example: ------------------------------------------------------------ saga::task t; saga::session s; { saga::context c (saga::context::GSI); s.add_context (c); saga::file f (s, url); t = f.copy <saga::task::Task> (target); s.remove_context (c); } // as it leaves the scope, the gsi context gets destroyed. t.run (); // the task can not use the GSI context, although the file // object and the copy task have been created in a session // with a valid GSI context. ------------------------------------------------------------ The problem really is that, as a context gets removed, no assumption is made about the fact that the session might have active objects which are currently using that context. The example above is harmless - image a context getting removed between two subsequent read calls, or while a task is _running_. I would propose to change the semantics of remove_context to be advisory, i.e. to allow existing objects and tasks to continue to use the context if (and only if) it was already used by them before. The session SHOULD free context related resources as soon as no object uses it anymore. list_context() MUST NOT list the removed context anymore. We have similar mechanisms in place to keep sessions alive if they are needed by objects, and to keep objects alive if they are needed by tasks. So that would be a somewhat coherent approach. The downside of course is that, at one more place, resource deallocation is out of sync with the appearent object destruction. Any opinion? Cheers, Andre. -- "So much time, so little to do..." -- Garfield

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CVS down
by Andre Merzky 14 Jul '06

14 Jul '06

Hi folx, the SAGA CVS is down since a couple of days. We have contacted the respective admins, and hope the problem gets resolved soon. Sorry for any trouble that causes. Cheers, Andre. -- "So much time, so little to do..." -- Garfield

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Fwd (replogle@ggf.org): [gf-chairs] Input needed for Standards Direction in Open Grid Forum
by Andre Merzky 13 Jul '06

13 Jul '06

Hi group, please consider to provide input to the zoomerang survey below. The results will be discussed at the GFSG Standard F2F which will happen next week (I think). Cheers, Andre. ----- Forwarded message from Joel Replogle <replogle(a)ggf.org> ----- > To: gf-chairs(a)ggf.org > From: Joel Replogle <replogle(a)ggf.org> > Subject: [gf-chairs] Input needed for Standards Direction in Open Grid Forum > Date: Thu, 13 Jul 2006 13:07:29 -0400 > > All - If you have not completed the linked zoomerang survey regarding > the priorities and direction of Standards in OGF, please take a few > minutes to do so. We are extending the deadline until tomorrow > (Friday, 14 July) end-of-day. Your input is needed to help shape OGF > Standards' direction and priorities. > > http://www.zoomerang.com/survey.zgi?p=WEB225GBEJ3S9N > > Original message from Dave Snelling: > >Folks, > > > >The establishment of the Open Grid Forum represents an inflection > >point in our standardization efforts with regards to grid software > >interoperability. As part of a larger overall strategic process, we > >are surveying key experts from the grid community regarding > >standards directions and priorities over the next 12 to 18 months. > >We would therefore like you to complete a short survey covering > >several aspects of standards development. > > > >Please follow this link for our zoomerang-based survey and accept > >my apologies if you receive this request more than once. > > > >http://www.zoomerang.com/survey.zgi?p=WEB225GBEJ3S9N > > > >Please take a moment to fill out the survey by end-of-day Thursday, > >13 July 2006 - your input is critical. > > > > > >Thank you for your thoughts, > > > >Dr. David Snelling > >VP Standards Open Grid Forum. > > Thanks for your participation, > > Joel > > ------------------------------------------------------------------------ > ----------- > Joel Replogle - Manager of Standards, Global Grid Forum > replogle(a)ggf.org http://www.ggf.org ----- End forwarded message ----- -- "So much time, so little to do..." -- Garfield

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