SERVER_ERROR out of memory on small puts to memcache.

Matt Knox matthewknox at
Tue Nov 13 22:14:22 UTC 2007

The problem seems to have gone away on bouncing memcache, and we can't
replicate it, even though we started memcache in exactly the same way, on
the same machines.  We'll probably make 3 1Gb instances instead of the 3G
instances if it recurs.

thanks for the help!


On Nov 11, 2007 9:06 PM, dormando <dormando at> wrote:

> *pulls old mail out of garbage*
> Curious if you're still having this issue? If it's been fixed/etc? I
> didn't see any noise on the list about it since.
> Matt Knox wrote:
> > I consistently get an out of memory error when performing  < 44 byte
> > (key+data) puts to memcache, but when 'put'-ing the same key with data
> > that is long enough to exceed 44 chars key + data  , I succeed.  I
> > observe this behavior using both the ruby client (memcache-client 1.5)
> > and the python one (python-memcached), although the python client seems
> > to break at 59 chars, rather than 44.
> Spiffy! Can't reproduce it on a 64-bit host. Haven't tried 32-bit.
> > I'm running memcached 1.2.2 with the following options:
> >
> > memcached -d -p 11211 -u nobody -c 1024 -m 3072
> >
> > The offending servers are recent CentOS running 3G of cache each on
> > 32-bit boxes with 4G ram-if it matters, I can get details about these.
> I suspect that's a big deal. The maxbytes limit doesn't include random
> buffers that are used for connections, stats commands, this and that. So
> you'll be apt to bowl over the 32-bit address space. I've never trusted
> that the different splits even work.
> So, if you are still having this issue:
> - How'd you build memcached?
> - Exactly what version of centos?
> - Does it happen after memcached has been up for a long time, or
> immediately?
> - Does it still happen if you lower the -m option to 1.6-1.8 gigabytes?
> Thanks,
> -Dormando

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     ((ahandler (type e)) e l d c)
     (eval (car e) l d
             (fun (x)
                (evapp x (cdr e) l d c)))))
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