Hello,
i don't know exactly if it is memcached issue (or OS / libevent)
but time to time (~2 days)
one or two of 6 memcached servers stops respond \ accept new connections,
restart required :(
strace output is:
Process 20417 attached - interrupt to quit
00:21:15 epoll_wait(3, {}, 32, 1) = 0 <0.001060>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010074>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010074>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010074>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010072>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010072>
00:21:15 epoll_wait(3, {}, 32, 10) = 0 <0.010073>
00:21:15 epoll_wait(3, ^C <unfinished ...>
Process 20417 detached
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
-nan 0.000000 0 789 epoll_wait
------ ----------- ----------- --------- --------- ----------------
100.00 0.000000 789 total
pidof memcached
20417
00:21:55 up 2 days, 15:20, 1 user, load average: 4.50, 4.75, 4.25
top - 00:22:12 up 2 days, 15:20, 1 user, load average: 4.57, 4.75, 4.26
Tasks: 112 total, 1 running, 111 sleeping, 0 stopped, 0 zombie
%Cpu(s): 62.6 us, 0.0 sy, 0.0 ni, 37.4 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
KiB Mem: 32922088 total, 6595136 used, 26326952 free, 169480 buffers
KiB Swap: 7811068 total, 0 used, 7811068 free, 4703516 cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
20417 nobody 20 0 941m 434m 1036 S 799 1.4 817:03.77 memcached
MemcachePool::getstats(): Server localhost (tcp 11211, udp 0) failed with:
Connection timed out (110)
netstat -tpn|grep ':11211'|wc -l
44
memcached_1.4.15 libevent_2.0.19-stable or 2.0.21-stable
/usr/bin/memcached -m 30720 -u nobody -t 8
3.5.0-22-generic ubuntu-quantal
Intel(R) Xeon(R) CPU E3-1230 V2 @ 3.30GHz
32gb ram,
Manufacturer: Supermicro
Product Name: X9SCL/X9SCM
avg_load:
~8K Cons/sec
~40K Request/sec (set,inc,get)
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