[Beowulf] Re: ECC Memory and Job Failures (Huw Lynes)
Robert G. Brown
rgb at phy.duke.edu
Fri Apr 24 04:31:50 PDT 2009
On Fri, 24 Apr 2009, John Hearns wrote:
> 2009/4/24 Robert G. Brown <rgb at phy.duke.edu>:
>> I don't think memory is all that unstable, especially down where I live.
>> In Denver, maybe. I think you need a lot of RAM, for a long time, to
>> see a lot of radiation induced errors, or a source of high energy
> I thought more of a motherboard of RAM chips - which were flat in
> those days (mumble) years ago, and putting a radiation source directly
> above them. Poor man's silicon strip detector.
I vaguely remember an article long ago where somebody opened a RAM chip
and hooked it up so that they could play with the timing refresh. RAM
is sensitive to light. They wrote an array of ones while projecting an
image onto it, waited a suitable amount of time, and could read the
image out of the memory in 1's and 0's where the light hitting the array
discharged the caps. A poor man's camera.
Hmmm, let's see. Yeah, there is even a patent somebody filed for this
So this might work if you had enough flux.
Hah! Google IS your mighty friend! Google up:
Radiation Dosimetry Using Three-Dimensional Optical Random Access
Hmm, people make cheap neutron detectors out of DRAM.
So I guess this would work, but I still think you need a pretty peppy
particle. The article suggests 0.5 MeV or up.
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Robert G. Brown http://www.phy.duke.edu/~rgb/
Duke University Dept. of Physics, Box 90305
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Phone: 1-919-660-2567 Fax: 919-660-2525 email:rgb at phy.duke.edu
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