[Gllug] server sleeping

[Daniel P. Berrange]

On Thu, Sep 14, 2006 at 01:02:42AM +0100, Nix wrote:
> On Mon, 11 Sep 2006, t. clarke wrote:
> > Silly question possibly  -  but have you tried running Memtest86 on the machine?
> > a dodgy chip can cause all sorts of problems with the machine gets busy and uses
> > up all its RAM!
> 
> In my experience a good few GCC bootstraps can find memory and CPU
> faults that a memtest86 can easily miss.

In large SMP machines that typically won't stress things enough because
it won't utilize enough resources strenuously enough. Last time I did stress
tests I used a combination of things. Given a N logical cpu machine, used N
copies of IOZone each doing IO in sizes > physical RAM (ensuring kernel VM 
can't cache all the IO), N parallel kernel compiles (to ensure the schedular
had lots & lots of processes to move around between CPUs), and N copies of 
a program doing a memory bandwith test (to max out the entire memory sub-
system). That could normally kill the faulty boxes in a couple of hours 
with ECC errors, or just a spontaneous reboot :-)

Dan.
-- 
|=-            GPG key: http://www.berrange.com/~dan/gpgkey.txt       -=|
|=-       Perl modules: http://search.cpan.org/~danberr/              -=|
|=-           Projects: http://freshmeat.net/~danielpb/               -=|
|=-   berrange at redhat.com  -  Daniel Berrange  -  dan at berrange.com    -=|
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 196 bytes
Desc: Digital signature
URL: <http://mailman.lug.org.uk/pipermail/gllug/attachments/20060914/e5ae053f/attachment.pgp>
-------------- next part --------------
-- 
Gllug mailing list  -  Gllug at gllug.org.uk
http://lists.gllug.org.uk/mailman/listinfo/gllug