Mark Hahn wrote:
they blow up consistently on multiple 244's? might all the 244's have
the same potentially flawed cooling/heasink-compound/powersupply/etc?
Well, they are identical, so yes.
are you saying there's something _similar_ between the 244s and the 275s?
Nope, but both 244 machines behave the same as the two 275s. So I don't
really suspect a problem with a particular memory chip on a particular
machine for example.
is your ram ECC (and enabled as such in bios, preferably with scrub
enabled)?
Yup, w/scrubbing.
if ECC, have you run mcelog?
Yup. Nothing
We've tried FC4/5 on the 244 machines. At one point all were running
identical FC5 installs with the same problems.
why do you think the problem is software?
I'm very confused at this point.
Problem is not exactly reproducible unfortunately. It will crash at
different times in the simulations, but they will crash at some point
with the length of runs we are doing.
sounds like heat/power to me.
Possible, but the machines are actually fairly lightly used with our
model tests - just one processor. sensors reports CPU temps <= 40C
>> Are there any cpu tests out there that would check the accuracy of
various calculations?
you don't mean accuracy, do you? like some subtle problem with
low-order bits?
I tend to use HPL for this kind of test - it's not to hard to tune it to
use however much memory you want, and to run for as long as you want.
it's not
the ultimate memory-grinder, but it's pretty intense.
I do mean accuracy, and not necessarily subtle - things blow up bad.
Perform some set of calculations over and over and error if it doesn't
give the expected result.
--
Orion Poplawski
Technical Manager 303-415-9701 x222
NWRA/CoRA Division FAX: 303-415-9702
3380 Mitchell Lane [EMAIL PROTECTED]
Boulder, CO 80301 http://www.cora.nwra.com
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