(trans)portable Beowulf

Jim Lux James.P.Lux at jpl.nasa.gov
Tue Nov 14 09:12:01 PST 2000

In fact, this is the case... The processor and ram are essentially the same
in a laptop as in the desktop, and consume the same power. The savings in
laptops come mostly by clever power switching of peripherals (i.e. turn off
the printer port drivers when you don't need them), and, as Michael points
out, by "modulating" the processor clock rate.
-----Original Message-----
From: Michael Stein <mas at ucla.edu>
To: Robert G. Brown <rgb at phy.duke.edu>
Cc: Ken <lowther at att.net>; Jim Lux <James.P.Lux at jpl.nasa.gov>;
beowulf at beowulf.org <beowulf at beowulf.org>
Date: Tuesday, November 14, 2000 8:10 AM
Subject: Re: (trans)portable Beowulf

>> You don't mention budget (that I recall) in your project description.
>> If "price is no object" you might look carefully at e.g. laptop-based
>> components.  There are matched CPU, motherboard, memory sets out there
>> that consume far less power than an ATX motherboard and OTC CPUs.  I
>> think I recall IBM just announcing something that will allow their
>> newest laptops to run 8 hours active on a single charge.
>I'd test a laptop before I bought a bunch of them.  Possibly some of
>the power saving comes at the expense of not running the CPU at full
>speed (or not all the time).

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