Hi,
We're using memcached to cache content generated by another
application on the same server. Items that are cached are set to never
expire, as the application currently self decides when it will refresh
items already in the cache.
We run memcache with verbose output, and I occasionally see these one
or more entries in stderr:
Couldn't realloc input buffer
Sometimes, the memcached process will disappear, though I am not
seeing anything about that in the stderr/stdout output, other than the
message above. Sometimes there can be multiple realloc error messages
in stderr with memcached still running.
It would appear that these issues only start creeping up once memcache
has reached its full capacity and starts evicting old entries. by
then, pyblibmc (which uses libmemcached) also occasionally produces
these errors:
ProtocolError: error 8 from memcached_set: PROTOCOL
ERROR
WriteError: error 5 from memcached_set: WRITE
FAILURE
Restarting memcached will stop the flow of errors until its full
capacity has been reached.
We run memcached as follows:
memcached -v -l 127.0.0.1:11211 -d -m 1024 -c 2000 -P /home/user/var/
run/memcached.pid
We're running version 1.4.10 on a debian lenny virtual server (OpenVZ)
on a RedHat 5.4 host (all 32-bits)
Memcached is run with ulimit -v 3145728 and ulimit -n 2048
On average, it has only about 10 active connections. Stats output (of
an instance that is currently showing these errors):
Server: 127.0.0.1 (11211)
pid: 27796
uptime: 106129
time: 1325774833
version: 1.4.10
libevent: 1.3e
pointer_size: 32
rusage_user: 66.145944
rusage_system: 380.068220
curr_connections: 9
total_connections: 4891692
connection_structures: 189
reserved_fds: 20
cmd_get: 3943901
cmd_set: 1128643
cmd_flush: 0
cmd_touch: 0
get_hits: 3819106
get_misses: 124795
delete_misses: 0
delete_hits: 0
incr_misses: 0
incr_hits: 0
decr_misses: 0
decr_hits: 0
cas_misses: 0
cas_hits: 0
cas_badval: 0
touch_hits: 0
touch_misses: 0
auth_cmds: 0
auth_errors: 0
bytes_read: 11143419126
bytes_written: 28858478649
limit_maxbytes: 1073741824
Any tips?
