最初使用cmemcache是为了速度，但是使用cmemcache中间出现了很多错误

python foo.py > foo.log

1，如果关闭了memcahed，则会导致运行的脚本退出
[FATAL@1270652735.543860] mcm_server_send_cmd():2706: failed to send command to the memcache server: Broken pipe: Broken pipe

2，运行时间长了后出现

但是实际上状态应该是正常的

WARN@1270652729.675463] mcm_server_readable():2582: timeout: Operation now in progress: select(2) call timed out for read(2)able fds
[INFO@1270652730.818440] mcm_get_line():1592
[WARN@1270652732.818742] mcm_server_readable():2582: timeout: Operation now in progress: select(2) call timed out for read(2)able fds
[INFO@1270652732.818905] mcm_get_line():1592
[WARN@1270652734.820281] mcm_server_readable():2582: timeout: Operation now in progress: select(2) call timed out for read(2)able fds
[INFO@1270652734.820450] mcm_get_line():1592
[ERROR@1270652735.542325] mcm_buf_read():361: read(2) failed: Operation now in progress: server unexpectedly closed connection
[FATAL@1270652735.542407] mcm_get_line():1600: internal memcache(3) assertion: Operation now in progress

3，有时候会出现把操作结果直接打印的情况

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