[AG-TECH] New hardware specification for AG 2.0?
bdr at internet2.edu
Wed Feb 19 07:33:31 CST 2003
I'll even add my $.02 worth - we're running our AG on a single, dual
processor machine. It is a Dell 530 with dual 2.4Ghz CPUs, 1GB of RAM,
and the onboard AC 97 audio chip. While the Gentner software is
installed and available for use, it is not left running after the
Gentner is configured.
Of course, we're using the AG-PIG software, modified to support multiple
cameras, as well a a Matrox Parhelia AGP display card which support 3
projectors. It works just fine - except the intial launch of vic cause
an error. When the web page is "refreshed", vic restarts with no
problem the second time.
We've retired our multiple-machine AG node.
Osland, CD (Chris) wrote:
>[Warning - this reply has grown a bit long...!]
>Can I chip in with some thoughts on this. I don't think AG 2.0
>is actually the agent of change, so much as the passing of time.
>When the 'recommended' hardware (which has previously been noted
>is more of a 'reference known to work' hardware set) was written
>down, 500 MHz was about tops for CPU power. If you wanted more,
>you went for dual 500 MHz.
>Now AMD 2200+ MPs is equally affordable on a per-chip basis, as are
>2.xx GHz Pentium 4s. Dual processor motherboards are not as
>expensive, compared to single processor ones, as they were, and they
>appear to be much more reliable than dual mobos a few years ago.
>As a result, it appears to me that a single machine with dual
>processors (AMD or Intel to personal choice) can provide the
>power to run what I'm currently running on 3 1.4 GHz AMD single
> display machine peaking at 100% utilization with about
> 20-25 video windows (and about half that when encrypted) (**)
> capture machine running at about 15% with 4 Hauppage cards
> audio machine barely idling
>(**) The fly in the ointment is the Gentner control software which
>hogs all remaining cycles as a result of polling over a serial
>line (ugh!!!). Setting its Windows priority to Low (the lowest)
>improves things, but in critical meetings I still kill it off
>to avoid 'sticky windows' problems.
>I like things rack-mounted, so am considering a single 4U machine
>with, say, twin 2400 MP processors (or whatever is affordable the
>week I place the order), Osprey twin capture cards (2 off 220s -
>which have the advantage of balanced audio I/O - saves a card
>and a bal-unbal box), and possible a 1U pensioned off server box
>just for the Gentner software!!! For display I like the idea of
>the Parhelia 3-output card (AGP) for the wall and something
>OK but not earth-shattering for the monitor - I might use a dual
>output card for that, as the combined windows from display, audio
>and video capture functions might be a bit crowded on a single
>monitor - my eyes aren't up to 1600x1200 displays unless they're
>about 32" wide!
>In summary, the power needed these days depends on the most complex
>meetings you aim to handle effortlessly. If you're regularly
>running 15 site meetings encrypted (we are headed that way) the
>display machine will probably need as much power as you can cram
>in one case all to itself. If 8 sites without encryption is more
>your style, you can probably put everything in one box, insofar
>as CPU power is concerned.
>Just my 0.02's worth.
>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
>[The contents of this email are confidential and
>are for the use of the intended recipient only.
>If you are not the intended recipient do not take
>any action on it or show it to anyone else,
>but return this email to the sender and delete your copy of it.]
>From: Jon Johansson [mailto:jon.johansson at ualberta.ca]
>Sent: 18 February 2003 22:45
>To: ag-tech at mcs.anl.gov
>Subject: [AG-TECH] New hardware specification for AG 2.0?
>We have finally got some money to buy hardware for an AG Room
>and I am now wondering whether the Access Grid Hardware Specification
>is going to change for AG 2.0. I know that several groups have
>got nodes working with 2 computers (one for display and control, and
>the other for both audio and video capture), is this going to become
>the new specification? This question is motivated by my interest in
>buying pieces, installing software and, as much as possible, having
>it work through the change from AG1 to AG2.
>We are considering the following hardware:
> Display computer: dual Xeon - 1 GB Ram
> Matrox G450 Dual Head AGP Graphics Adapter
> Matrox G200 Quad PCI Graphics Adapter
> Video Cap computer: dual Xeon - 1 GB Ram
> Hauppauge video capture adapters x4
> Audio Cap computer: single Xeon - 512 MB Ram
> Creative Ensoniq AudioPCI Audio Adapter x4
> Control computer: single Xeon - 512 MB Ram
>All computers have Ethernet and ATI RAGE XL 8MB video on the motherboards
>and IDE drives.
>I am particularly interested in audio and video capture cards with multiple
>inputs, are there any that people are finding usable? These seem to be
>necessary if you are going to reduce the number of PCI slots available
>by reducing the number of computers.
>The CPU usage on the capture computers must depend on how much processing
>is done in the capture cards, are there multi-input capture cards that
>will leave little for the CPU to do in terms of encoding?
>Are there alternatives to the Matrox graphics cards that are cheaper/
>The AG specification gives a price for the Matrox G450 Dual Head AGP
>Graphics Adapter of $200. When I go to the Matrox website the G450 cards
>seem to be PCI now and the prices are $600US for the dual head and $800 US
>for the quad head. Matrox doesn't seem to be selling the AGP cards anymore.
>Are these PCI cards acceptable for driving the displays?
>Are there alternative AGP graphics cards that would be suitable?
Bob Riddle (bdr at internet2.edu) Technologist,Internet2
3025 Boardwalk, Suite 100 Ann Arbor, Michigan 48108
Business Phone: 734.913.4257 Fax Number: 734.913.4255
"Opportunity is missed by most people because it is dressed in overalls and looks like work" Thomas Edison
More information about the ag-tech