Tony Travis wrote:
Excluded by a SPAM filter + reposted, by the list owner's request :-)
Hi Tony:
I am on gmail.com as joe.landman if spam filters are doing bad things ...
Joe Landman wrote:
Mark Hahn wrote:
- do you have or know of a good exerciser for testing ECC's? yes, I
know about memtest86, but I'm more curious about a load that could be
run under
linux. my thinking is that ecc's are triggered by bad reads, so something
which allocates all memory and then continually reads it would be best.
Thats memtest. We found it doesn't trigger MCEs, and often will report
a system as good, that once it leaves the lab, generates lots of MCEs on
customer code. So we run specific codes (GAMESS and others) to burn in
the machine.
Hello, Joe.
Do you mean Memtester?
http://pyropus.ca/software/memtester/
There are two that I know of ... memtest and memtest86, one of which is
a fork of the other. While I like both for coarse testing, we run a
bunch of GAMESS runs to burn nodes in. Some folks like HPL for this. I
like large dense matrix computations that pound on the memory subsystem.
I stress test non-ECC memory in our compute nodes by running 100
memtester passes on 128MB of the available RAM. This test often reveals
problems in the memory management system that an initial 24h memtest86+
burn-in on all the memory on a node doesn't detect. Memtester is a more
This is good to hear (that others find memtest86 and alike don't trigger
the errors that end users/customers see in the field).
empirical stress test than Memtest86+, but I believe it's more realistic
and I chose 128MB as typical for the type of jobs running on our system.
Excellent.
I really like running end user code as a test. GAMESS is one, probably
some Gromacs and other similar things (NAMD, BLAST, HMMer) as well.
Combined with Octobonnie, it makes for some really good loads on machines :)
Right now we have customers hammering on JackRabbits using 15-20
simultaneous bonnies over channel bonded gigabit. A little stress test.
I prefer to stress it in lab, because its harder to fix it in the field.
Joe
Joe
Bye,
Tony.
--
Dr. A.J.Travis, University of Aberdeen, Rowett Institute of Nutrition
and Health, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, Scotland, UK
tel +44(0)1224 712751, fax +44(0)1224 716687, http://www.rowett.ac.uk
mailto:[email protected], http://bioinformatics.rri.sari.ac.uk/~ajt
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--
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics LLC,
email: [email protected]
web : http://www.scalableinformatics.com
http://jackrabbit.scalableinformatics.com
phone: +1 734 786 8423 x121
fax : +1 866 888 3112
cell : +1 734 612 4615
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