[ec2] swap?

[Darren Govoni]

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 :)