今天重启sphinx进程时发现我只做了一次启动，却发现两个进程。
查文档得知。
Threaded server watchdog. Optional, default is 1 (watchdog enabled). Introduced in version 2.0.1-beta.
A crashed query in threads multi-processing mode (workers = threads) can take down the entire server. With watchdog feature enabled, searchd additionally keeps a separate lightweight process that monitors the main server process, and automatically restarts the latter in case of abnormal termination. Watchdog is enabled by default.
如果在searchd 配置中配置 workes=threads，默认会启动watchdog。watchdog会启动一个轻量级的进程监控searched进程，当searched进程挂掉时会自动重启。
关闭watchdog 后
重启sphinx
这次只启动了一个进程。
为了保证系统的稳定运行，不建议关闭watchdog。
