Memcached "squeezed" out of memory?

[Brad Fitzpatrick]

Don,

Can you run a script that logs top -p <pid> every hour or so, and post a
log of it all, from startup to crash?

We have memcached processes up for 172 days, so any time I hear about
a problem like this, I freak out.  I hope it's something else on your box
bloating in memory and making memcached swap, but I'm still paranoid.

Have you run memcached with -k to keep its memory pinned?

- Brad


On Wed, 7 Sep 2005, Don MacAskill wrote:

>
> Hi Joel,
>
> Did you ever get any replies about this?
>
> I think I'm seeing similar behavior on RHEL4.  memcached stops
> functioning and I have to stop and restart the processes every few days.
>
> I run 4 instances per machine, and all 4 fail at the same time.
>
> I haven't let them run for long enough to see if they're getting
> 'squeezed', but all the other symptoms sound the same, so I'll bet they are.
>
> Anyone else seeing this?
>
> Don
>
>
> Joel Lee wrote:
> > Greetings..
> >
> > I'm running memcached 1.1.12 with libevent 1.1a on an RHEL4 box (uses a 2.6 linux kernel).  I've varified that this installation is using epoll.
> >
> > What I notice happening is that memcached will suddenly stop working and as it does so, it's share of resident memory steadily decreases--almost as if it's being "squeezed out" of memory.  I'm not sure if that is actually what is happening, memory wise, but that is what seems most remarkable to me.
> >
> > I can cure this by restarting memcached and apache.  It will then work fine again... typically for a couple of days or so, until another such incident will occur.
> >
> > Here is the line I use to start memcached:
> >
> > ./memcached -d -p 9008 -m 512 -l 127.0.0.1
> >
> > I have 2GB of system memory on this machine.
> >
> > Any ideas, or methods for collecting additional information I could post?
> >
> > Thanks for any help.
> >
> > Joel
>
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