Amber Boehnlein, FNAL DO Computing Model Amber Boehnlein

Amber Boehnlein, FNAL A different talk  The talk I’m about to give, I would will be short because I hope it will spur discussion. I wish, in fact that I could have been at Latech, to see the azaleas blooming and to have long discussions about these topics at leisure.

Amber Boehnlein, FNAL Recent SAM progress  JIM in use by Joel for production level requests  Functionality includes merging  'infrastructure efficiency' is nearly 100%. Fabulous progress towards milestone Thanks Joel very much for his cooperation and help!  SAM is in the process of testing the new dbserver with other servers upgraded to be compatible with it, and has successfully run projects in development.  The one-step SAM installation procedure which was developed with CDF effort and has been working for some time at CDF was debugged for a D0 installation last week by Adam Lyon and Art Kreymer. It is very close to being ready for general use, and we recommend that anyone installing or considering a station install wait till we have this declared ready for use, which should be just a couple of weeks.  SAMGrid will spend the week of April on documentation issues. Working groups will tackle user documentation, station admin documentation, and shifter documentation as well as other areas.

Amber Boehnlein, FNAL DO Computing Model  After many years of the work, the D0 computing model is substantially complete.  The model is the most complete and successful model currently existing  What does “successful imply”?  Operationally stable with no known scaling issues  Development coming to an end—features are either present or have been cut  Sufficient hooks are present to monitor and control resource consumption.  Operational model in place (SAM shifters)  What does “successful” not imply  Infinite resources. A successful model makes best use of the resources it has  Infinite development. Sometimes it’s time to cut bait.  Infinite involvement. The Computing Division is moving on, and more will fall to the experiment

Amber Boehnlein, FNAL What’s Next  Substantially done is not done  Tuning use of SAM-cache and replacing D0mino  Database and database server issues  Last major effort will be to get reprocessing effort using final tools  Runjob development (with CMS and CDF)  D0tools retooling  Introduction of JIM component of SAM in general use for “projection activities.  Major problems remain on the application side  Proposed cardfile database to at least track the GIGO problem with simulation  There is no long term analysis mode  Experiment proposed “production activities without understanding what production means  Most of these could be soldiered on with indefinitely, at the cost of poorly using hardware resources. That’s a shame, but the horse can only be lead to water  Of course, the experiment would be nuts to move away from a successful model—but that might not stop them.

Amber Boehnlein, FNAL What’s next  Grid workshop in London  Reprocessing issues are the focus  Other more general grid issues as well—but these are agendas in which DO is a pawn and a bargining chip.  What changes occur within D0 are going to depend as much on how much accommodation D0 has to make to maintain expert leave support as on what D0 “needs”.  D0 really, really needs stability and work on algorithm development

Amber Boehnlein, FNAL Question to DOSAR  What is the balance between D0 and SAR??  It’s very tempting for many groups to want a slice of the grid pie— but the “snake oil” days are over.  Establishing credentials means working with existing groups.  Homegrown might still fly on D0, but not in the grid community. As products transition to “real”, there is an increased value assigned to cost/benefit and operational models and stabilities.  D0SAR is major contributor to D0  UTA is major contributor of MC—and don’t underestimate the importance of that. It might not be “sexy”, but it puts dinner on the table.  D0SAR is contributing people to general efforts—Joel, D0 shifters.  D0SAR could contribute in other ways to D0  Take on a task that furthers the analysis model/model –Edmroot or other format issues –Code distribution –Contribution to runjob –Contribution to simulation cardfile database Such projects could give D0SAR analysis and computing credentials of LHC