[Beowulf] Re: ECC Memory and Job Failures (Huw Lynes)
gerry.creager at tamu.edu
Mon Apr 27 08:07:08 PDT 2009
Robert G. Brown wrote:
> 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.
This is the process that led to the original CMOS imaging chips. And, I
still use one for visible light astro-imaging.
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University
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