長連線是幹嘛的： 它是做連線復用的；
在openresty中的lua-resty-mysql 裡
connect方法去連線mysql時會去ngx_lua cosocket連線池中尋找是否有可用連線
如果有就直接復用；
如果沒有就與mysql建立新連線，連線成功後立即將這個連線放入ngx_lua cosocket連線池中。
本人用ngx-lua + mysql 做的乙個測試
開啟長連線：
關閉長連線：
[root@www ~]# webbench -c 100 -t 60 ""
webbench - ****** web benchmark 1.5
benchmarking: get
100 clients, running 60 sec.
speed=32749 pages/min, 273873 bytes/sec.
requests: 32191 susceed, 558 failed.
[root@www ~]# webbench -c 1000 -t 60 ""
webbench - ****** web benchmark 1.5
benchmarking: get
1000 clients, running 60 sec.
speed=46504 pages/min, 280990 bytes/sec.
requests: 34301 susceed, 12203 failed.
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