[Beowulf] Strange hardware? problems

Don Kinghorn kinghorn at pqs-chem.com
Fri Apr 27 13:40:46 PDT 2007

Hi Orion,

I haven't used the S2882 Tyan boards per say but many other Tyan boards. It 
sounds like you are having a memory problem on the 2882 and not on the 
2882-D, they probably have different bios versions. 

You didn't mention your memory configuration but if you have an older bios and 
all the memory banks full with double rank memory you will probably need to 
lower the memory clock manually

My first recommendation is check the bios. These kind of memory problems don't 
always show up with memtest86+

Best of luck

> I'm at a loss and trying to see if anyone else has had similar problems.
> We've got two pairs of identical machines:
> - 2 Tyan S2882 dual processor Opteron 244 stepping 10
> - 2 Tyan S2882-D dual processor dual core Opteron 275 stepping 2
> We have two (relatively complicated) numerical models (RAMS and a 
> homegrown one) that will blow up in random locations on the 244 machines 
> but run fine on the 275 machines.
> By blow up it appears the calculations get corrupted in some way and the 
> numbers get un-physical in RAMS and the simulation exits.  With the 
> other model we get segfaults.
> Memtest86 runs fine.  No other hardware issues that I can find.
Dr. Donald B. Kinghorn Parallel Quantum Solutions LLC

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