Building A 96-Core Ubuntu ARM Solar-Powered Cluster
Phoronix: Building A 96-Core Ubuntu ARM Solar-Powered Cluster
Last week I shared results from the Phoronix 12-core ARM Linux mini cluster that was constructed out of six PandaBoard ES development boards. Over the weekend, a 96-core ARM cluster succeeded this build. While packing nearly 100 cores and running Ubuntu Linux, the power consumption was just a bit more than 200 Watts. This array of nearly 100 processor cores was even powered up by a solar panel.
Power consumption is high in idle.
3W in Idle for an omap4430, is a bit huge
I know some smartphones powered by omap4430 that use only 5mA in idle on 4.7V battery, so about 24mW.
normally the core can be switched OFF at runtime, and most peripheral too.
So it seems Ubuntu can't do it (maybe due to the ethernet port ?).
Additional details on Panda Cluster
We will try to get the specs up on the web. Meanwhile, here are the basics (I am one of the guys who worked on it).
We started with Chris Tyler's excellent HOWTO...
and then bought Koutech 13-port USB hubs... we were chugging along pretty well in the 5v DC domain until we had to get a 48-port ethernet switch, which was a 3Com 2250 Plus (48 FastE and 2 GigE ports). Case was a Rubbermaid 9P90 Plaza Jr. (35 Gallon) Container which looks a lot like a Seahorse Power BigBelly.
Solar system was a "solar popcorn cart" from http://futuresolar.wordpress.com/ I think we will revisit this part of the equation; one of our guys has a cool MPPT controller (some pix of which used to be at http://solarwirelessmile.com/)... so next time we will try this without battery.
I'll get some more material together for a website and report back. We got good advice from some of the regular posters here. User drjo suggested we get rid of SD and use something else for the fs. We have tried booting with the usboot utility from Pandaboard.org with mixed results. Must not like the hubs, we think. Anyway, more to come.