Comment #11 on issue 375 by [email protected]: Accept4 on FreeBSD 10 -
sockets stuck in CLOSE
https://code.google.com/p/memcached/issues/detail?id=375
The test on FreeBSD 9 caused a stuck, too but this one looks different.
- The log complains about "accept(): Too many open files" but it's far away
from the limits.
- There are "only" 192 connections permanently stuck in CLOSED.
- I cannot connect via telnet to this server anymore (a still open telnet
connection works though).
- The stats command shows a low number of active connections
I have to note that memcached 1.4.20 is linked against libevent
1.4.14b-stable on this system which might be a source of this issue (the
FreeBSD 10 memcached is linked against libevent 2.0.21-stable).
We will run another test with an updated libevent on monday.
FreeBSD 9 values:
stats
STAT curr_connections 5
STAT total_connections 17626537
STAT connection_structures 8176
stats conns
STAT 16:addr tcp:192.168.1.53:11222
STAT 16:state conn_listening
STAT 16:secs_since_last_cmd 17825
STAT 17:addr udp:192.168.1.53:11222
STAT 17:state conn_read
STAT 17:secs_since_last_cmd 17825
STAT 18:addr udp:192.168.1.53:11222
STAT 18:state conn_read
STAT 18:secs_since_last_cmd 17825
STAT 19:addr udp:192.168.1.53:11222
STAT 19:state conn_read
STAT 19:secs_since_last_cmd 17825
STAT 20:addr udp:192.168.1.53:11222
STAT 20:state conn_read
STAT 20:secs_since_last_cmd 17825
STAT 22:addr tcp:192.168.6.210:54704
STAT 22:state conn_parse_cmd
STAT 22:secs_since_last_cmd 0
sysctl -a | grep files
kern.maxfiles: 12328
kern.maxfilesperproc: 11095
kern.openfiles: 813
fstat | grep memcached
[... skipped about 20 lines of pipes and regular files ...]
16* internet stream tcp fffffe006599a000
17* internet dgram udp fffffe021126b498
18* internet dgram udp fffffe021126b498
19* internet dgram udp fffffe021126b498
20* internet dgram udp fffffe021126b498
22* internet stream tcp fffffe02c796a3d
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