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'Desktop multiplier' takes limited PC resources a long way

By: Nestor E. Arellano - ITWorldCanada.com  (06 Jun 2007)

System cuts hardware expenses by half, power consumption by 62 per cent

COMMENT ON THIS ARTICLE

A desktop virtualization software product developed by an Calgary-based company is teaching students at an Illinois middle school some pretty impressive multiplication lessons.

Several students at Danville School District 118 (up to eight) are able to gain simultaneous computer access to a single Linux PC using the Desktop Multiplier for SUSE Linux Enterprise Desktop 10 (SLED 10), developed by software firm Userful Corp. and distributed by Omni Technology Solutions Inc., or Edmonton.

Not only did the multiplied desktop strategy enable the school to stretch its PC budget, it also helped reduce associated infrastructure and power outlay, according to a spokesperson for the school district.

"[We] saved thousands of dollars [by avoiding] costly Internet drops, switches, network wiring and support costs," said Christel Powell, manager of information systems at Danville School District.

For instance, Powell said, the cost of installing conduits and wires for two 120-volt circuits in a single room was around $2,700. The school was able to nick this expense because each classroom already had one data port and the multiplied desktop system required no additional network or electrical wiring changes.

She said the School District was able to cut hardware expenses by as much as 50 per cent.

The new system, she said, is also environmentally friendly because it reduces power consumption by 62 per cent and slashes PC recycling overhead by 70 per cent.

The multiplied desktop strategy is quite straightforward, according to Aldo Zanoni, CEO of Omni.

By installing the Desktop Multiplier SLED 10 on a Linux PC, adding video cards and a powered USB hub, up to 10 monitors equipped with separate peripheral devices such as keyboards and mice can run "full-featured user sessions at the same time" from a single computer, said Zanoni.

He said Danville chose an eight-user Linux desktop bundle which includes an Intel Core 2 Duo 2.1 Ghz system with 2 GB of RAM, a 250 GB hard drive, eight monitors, eight USB keyboards and mice, eight audio headsets and a USB hub.

Zanoni said the system offers several key advantages over thin clients or dumb terminals .

Rather than transmitting data from a thin client server to individual thin clients over an Ethernet cable "users of Desktop Multiplier have direct access to the system and have a much richer user experience."

He also said thin clients and also requires the purchase of PC units rather than less expensive monitors.

The Linux Desktop Multiplier is a layer of software that sits on top of the Linux kernel and "listens" for keyboard and mouse inputs and monitor outputs. The software then assigns these three items to a unique user session, according to another Omni executive.

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Desktop multiplier takes limited PC resources a long wayReply to this commentReport an innapropriate comment
This system is similar to one available from http://groovix.com and use the x-window-system of Linux which recently was modified to permit multiple screens, keyboards and mice. This is often called multi-seat X. Aside from connecting inputs/displays to the right session, the system relies on the fact that a typical modern PC is idling most of the time using only 1% of the CPU time. This is because users click and then enjoy the result. CLicks by other users can be serviced while the first user watches the screen. Another advantage of this system besides getting more value form the hardware is that users often use the same files, like the same web browser. With Linux, the first user to run the browser loads the application from the hard drive. The second user gets to use the same file again with much less delay. This makes such systems much faster than an ordinary computer because it is more efficiently caching files. Systems need 50-100 MB RAM per user, 100 MHz of CPU speed, and a pair of USB ports per user. The system will use multiple video cards for the users' monitors. Another related technology which has similar advantages and even lower power consumption is the Linux Terminal Server Project (LTSP.org). It is available on many distros and in particular ones designed for school like K12LTSP and SkoleLinux, and EdUbuntu. LTSP uses a powerful central server to run most applications and the thin client (often using only 10 watts and without fans or drives) boots over the network from the server and allows the user to log in. This technique needs a hefty server and a good network but it is easier to administer since there are only hard drives on the server.
Written by: Robert Pogson, from
Desktop multiplier takes limited PC resources a long wayReply to this commentReport an innapropriate comment
This system is similar to one available from http://groovix.com and use the x-window-system of Linux which recently was modified to permit multiple screens, keyboards and mice. This is often called multi-seat X. Aside from connecting inputs/displays to the right session, the system relies on the fact that a typical modern PC is idling most of the time using only 1% of the CPU time. This is because users click and then enjoy the result. CLicks by other users can be serviced while the first user watches the screen. Another advantage of this system besides getting more value form the hardware is that users often use the same files, like the same web browser. With Linux, the first user to run the browser loads the application from the hard drive. The second user gets to use the same file again with much less delay. This makes such systems much faster than an ordinary computer because it is more efficiently caching files. Systems need 50-100 MB RAM per user, 100 MHz of CPU speed, and a pair of USB ports per user. The system will use multiple video cards for the users' monitors. Another related technology which has similar advantages and even lower power consumption is the Linux Terminal Server Project (LTSP.org). It is available on many distros and in particular ones designed for school like K12LTSP and SkoleLinux, and EdUbuntu. LTSP uses a powerful central server to run most applications and the thin client (often using only 10 watts and without fans or drives) boots over the network from the server and allows the user to log in. This technique needs a hefty server and a good network but it is easier to administer since there are only hard drives on the server.
Written by: Robert Pogson, from
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