[AG-TECH] upgrade questions

Osland, CD (Chris) C.D.Osland at rl.ac.uk
Fri Aug 2 03:48:54 CDT 2002

I take your point.  We have a regular meeting (every month) with
at least 10 sites - the current UK AG sites - all attending.  This
number is likely to increase to about 15 quite soon.  The number of
video feeds from each site varies from 1 to 4 depending on number of
participants and I normally land up with about 5 or 6 Mediums and 15
or so Smalls on the wall.  I've noticed that this brings me up
to 100% utilization (peaky) on our 1.4 GHz system and would like to
have some headroom in the performance.  I guess I should have stated
my target as 60-70% utilization rather than 30 windows!

However, as noted in an e-mail a week or so ago, I'm also interested
in the usability of more pixels on the wall, since with even 2
or 3 participating sites in a shared visualization project we
rapidly run out of wall space.  This would make it feasible to
accommodate higher numbers of video feeds worthwhile.  Even an
agenda and a working doucument (say one DPPT and one VNC) puts a
strain on wall space if there are lots of sites.

Re higher quality feeds, we are also interested in that, but
compressed D1 requires 270 Mbits/sec so a little compression may
be necessary until gigabit backbones get replaced by terabit ones!



Chris Osland                         Office tel: +44 (0) 1235 446565
Digital Media and Access Grid      Medialab tel: +44 (0) 1235 446459
BIT Department             Access Grid room tel: +44 (0) 1235 445666
e-mail:   C.D.Osland at rl.ac.uk               Fax: +44 (0) 1235 445597

CLRC Rutherford Appleton Laboratory (Bldg. R18)
Chilton, DIDCOT, Oxon OX11 0QX, UK

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-----Original Message-----
From: Luc Renambot [mailto:renambot at cs.vu.nl]
Sent: 01 August 2002 17:30
To: ag-tech
Subject: RE: [AG-TECH] upgrade questions

just on the side, Does it make sense to display 30 video
streams on a display of 3x1024x768 ? I would be interested
to see if it's possible to get a few better quality streams
(full res. D1, for ex.) without extra hardware coder/decoder


] -----Original Message-----
] From: owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov]On
] Behalf Of Osland, CD (Chris) 
] Sent: Thursday, August 01, 2002 12:28
] To: 'darin at ucar.edu'; ag-tech
] Subject: RE: [AG-TECH] upgrade questions
] A late reply, as I've been out of the lab.
] We use 3 1.4 GHz AMD single processors each with 512M memory.
] 4 video inputs, 3 projectors, G450 and G200 video cards on display
] machine.
] We tend to hit 100% utilization on the Display machine around
] 21 windows (Medium or Small); we see about 10% utilization per
] video capture card on the Capture machine; utilization of the
] audio machine is negligible.  I'll upgrade the display machine
] to 2.x GHz whenever I can, hopefully then allowing about 30
] video windows.  We got all the machines the same to make
] swapping easy.

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