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Manchester Computing Supercomputing, Visualization & e-Science Michael Daw 29 April 2004 Over Access Grid Access Grid An Evaluation Primer for CERN
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Supercomputing, Visualization & e-Science2 Content Summary What is Access Grid? What does the community look like? How much will it cost? How do I get one? Will it work with other systems? Robustness & networking How will I book meetings? UK situation
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Supercomputing, Visualization & e-Science3 Typical Views of Access Grid ETF Management MeetingSeminar SC Global WorkshopPerformance Arte-Social Science
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Supercomputing, Visualization & e-Science4 What is Access Grid? Large-scale display – typically a whole wall Multiple video streams from each site Natural, full-duplex audio with echo cancellation An “Advanced Collaboration Environment” Uses IP multicast for video/audio Open Source software; commodity equipment Usually!
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Supercomputing, Visualization & e-Science5 Access Grid Community AG invented by ANL in 1998 More than 300 nodes in US 20 nodes in UK – set to rise ~10 nodes in Australia Other nodes in Europe, S. America, China, Japan
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Supercomputing, Visualization & e-Science6 Cost of an Access Grid Node "The Full Monty" – full AG node with nice extras like a document viewer, laptop, etc. ~ £40K "On the cheap" – full AG node but skimping where you can, e.g. no extras, 3 cameras, minimum microphones ~ £25K - £30K "Shove it on a desk" – AG Office Node. Can accommodate about 3-5 people, looks nice, good quality experience, fits on someone's desk, i.e. no need for room modifications ~ £8K "What's the point?" – AG desktop solution – not to be encouraged, because you lose a lot of the benefits of using Access Grid in the first place. Assume you use existing PC, costs include web cam, microphone headset ~ £50 - £300
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Supercomputing, Visualization & e-Science7 Getting an Access Grid Node 1.Buy one from inSORS Communications Inc. http://www.insors.com http://www.insors.com 2.Make it yourself – instructions at http://www.accessgrid.org/agdp http://www.accessgrid.org/agdp My advice – do option 1: –Less hassle –About as cheap as option 2 –Bespoke, easy to use software
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Supercomputing, Visualization & e-Science8 Interoperability Between Videoconferencing Systems* Host/dominant technology Access Grid VRVSH.323H.320Phone Access Grid YesWith VRVS server Problematic Yes VRVS Yes With H.323 / H.320 bridge Yes H.323 ProblematicYes With H.323 / H.320 bridge With most codecs H.320 ProblematicWith H.323 / H.320 bridge Yes Phone Yes Guest technology
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Supercomputing, Visualization & e-Science9 Networking Issues & Robustness AG uses IP multicast for video / audio streams (Mbone tools) Multicast-unicast bridges fill the gaps where no multicast Currently, bridges are informally run (many sites are willing to host a bridge) AGSC will run a production-quality bridge service for UK users (from 30 June) But AG does need big bandwidth (about 1 Mbps for each site taking part in the meeting)
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Supercomputing, Visualization & e-Science10 Booking Meetings Virtual venues are (potentially) as numerous as multicast addresses, therefore no real need to book But… –ANL run a scheduler: http://www-fp.mcs.anl.gov/ag/schedule.htmhttp://www-fp.mcs.anl.gov/ag/schedule.htm –NCSA run a scheduler: http://agschedule.ncsa.uiuc.edu/default.asphttp://agschedule.ncsa.uiuc.edu/default.asp The NCSA scheduler has extra features such as a repository for shared files UK AG sites may use JANET Videoconferencing Booking System in the future
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Supercomputing, Visualization & e-Science11 Videoconferencing Comparison Report Oct 2002 – publication of “Multi-Site Videoconferencing for the UK e-Science Programme” http://www.nesc.ac.uk/technical_papers/UKeS-2002- 04.html http://www.nesc.ac.uk/technical_papers/UKeS-2002- 04.html Comparison between Access Grid, H.323/H.320, VRVS, Non-Studio Based Videoconferencing * Table above used information from this report
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Supercomputing, Visualization & e-Science12 Access Grid Support Centre Based at Manchester Support for users, operators, procurement advice Quality Assurance tests Multicast-unicast bridge Virtual Venue Server IG Pix IG Recorder
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Supercomputing, Visualization & e-Science13 Reports for Specific Funding Recommendations Subjects: –Collaborative technologies R&D effort –Mbone tools –Booking system for Access Grid and related research –VRVS – Access Grid interoperability –H.323 – Access Grid interoperability –Improvements to local networking for videoconferencing To be submitted to JCSR for funding
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Manchester Computing Supercomputing, Visualization & e-Science Contact Details http://www.sve.man.ac.uk/General/Staff/daw michael.daw@man.ac.uk SVE @ Manchester Computing
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