[ec2] swap?

[Jeremy Edberg]

If you get any further results, please make sure to share them.  I too
am actively trying to pin down this bug, as it has crashed three of my
instances at this point, usually at the most inopportune times.

Although, in my case, a reboot has been able to save the instance.

Jeremy

On Sun, Jul 26, 2009 at 10:44, Darren Govoni<darren at ontrenet.com> wrote:
> Hey guys,
>   Good points. I use the high-cpu deployment which only has 7GB. I
> wonder if there will be a configuration of high-cpu with more than 7GB.
>
> The problem I am running into may be related to the other posted issue
> here when instances freeze.
>
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/276476
>
> Basically, all of my instances will freeze up after some time running
> where they are reading/writing AWS services heavily as well as local
> disk. I was concerned if its related to no virtual memory swap.
>
> Right now I am running a test with some output on memory,cpu and tail
> -f /var/log/messages to see what the condition is when it freezes.
>
> once it freezes I cannot even reboot it. Its gone forever.
>
> Darren
>
> On Sun, 2009-07-26 at 21:55 +1200, Robert Coup wrote:
>> On Sun, Jul 26, 2009 at 11:33 AM, Eric Hammond
>> <ehammond at thinksome.com> wrote:
>>
>>         In my own production servers I prefer to run with plenty of
>>         memory and
>>         no swap.
>>
>>
>> Likewise, certainly I don't run production machines with any more than
>> 256MB of swap, most have none. Reason being is once all the RAM is
>> consumed a process has gone haywire and needs to die. The more swap
>> there is the longer the time until the OOM-killer steps in. Until then
>> everything on the box grinds to a halt, new connections just hang,
>> there's no way to log in (15mins+ to a shell), etc. With no swap, the
>> out-of-memory killer steps up immediately and kills off the hungry
>> process. I'd much rather such an errant process dies (and is restarted
>> by monitoring) than the box grind to a halt.
>>
>>
>> Note this is a bit different from lots of processes (eg. apache
>> workers) slowly growing over time until there's no memory left. We
>> watch out for that via monitoring as well.
>>
>>
>> Rob :)
>
>
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