[ec2] swap?

[Darren Govoni]

The last outputs of my shells after my instance froze.
----

top - 15:34:47 up 33 min,  4 users,  load average: 33.97, 31.14, 22.82
Tasks: 232 total,  37 running, 191 sleeping,   0 stopped,   4 zombie
Cpu(s): 11.1%us, 26.0%sy,  0.0%ni, 36.1%id, 13.3%wa,  0.0%hi,  0.0%si,
13.5%s
Mem:   7366840k total,  7332864k used,    33976k free,      952k buffers
Swap:        0k total,        0k used,        0k free,    11160k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+
COMMAND         
23975 ubuntu    20   0 1318m 750m  928 S   89 10.4   0:26.48
java            
  172 root      15  -5     0    0    0 R   55  0.0   0:07.83
kswapd0     

[freeze point]


----
             total       used       free     shared    buffers
cached
Mem:          7194       6970        224          0          1
58
-/+ buffers/cache:       6909        284
Swap:            0          0          0

----
             total       used       free     shared    buffers
cached
Mem:          7194       7160         33          0          1
50
-/+ buffers/cache:       7108         85
Swap:            0          0          0

----
             total       used       free     shared    buffers
cached
Mem:          7194       7159         34          0          0
33
-/+ buffers/cache:       7125         68
Swap:            0          0          0

[freeze point]


On Sun, 2009-07-26 at 10:52 -0700, Jeremy Edberg wrote:
> 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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