[okfn-help] eu3 load issues
rufus.pollock at okfn.org
Fri Aug 20 20:23:41 BST 2010
cc'ing okfn-help (rather just sysadmin alias) -- seems more
appropriate (I think we should either deprecate sysadmin alias or turn
it into a dedicated mailing list ...)
On 19 August 2010 23:58, William Waites <william.waites at okfn.org> wrote:
> As Friedrich pointed out a little while ago, many
> log messages on eu3 like this:
> Aug 19 22:42:08 eu3 kernel: 4gb seg fixup, process ldconfig (pid 15268),
> cs:ip 73:08060475
> Seems to be an issue with 32 bit instances running
> in a 64 bit host under Xen, known issue for some
> time (ca 2007).
> This person seems to have had an experience which
> sounds remarkably similar to ours:
> I graphed the frequency of these messages versus
> system load (tried to get them to line up nicely)
Amazing detective work will and friedrich
> It seems inconclusinve whether there's a correlation.
> Assuming this is the problem, I can see three
> possible things we can do:
> * upgrade the kernel on eu3 to something more
> recent (means rebuilding it) and hope the problem
> goes away.
> * upgrade eu3 to a 64-bit host (means rebuilding
> it and expensive)
> * start divesting ourselves of AWS (means rebuilding
> it but may be cheaper and in the long run better)
I an immediate initial think would be to separate DB and Frontend
(webapp). This would also give us a clearer picture of what is
> Friedrich has opened a ticket with AWS to see what
> they have to say, but we have no support contract
> with them so we'll see what and when we hear back
> from them.
Yes, if you aren't paying for support you basically get no answer ...
Could try the forums too?
> In the meantime, continuing to look at other
It would be great if we could reproduce the problem -- we could spin
up a temporary AWS box, put on a ckan instance and fire lots of
requests at it ...
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