多个 resque worker 模式创建额外的进程

Question

我需要启动 4 个 resque worker，所以我使用了以下命令

bundle exec rake environment resque:workers RAILS_ENV=production COUNT=4 QUEUE=* VERBOSE=1 PIDFILE=tmp/pids/resque_worker.pid  >> log/resque_worker_QUEUE.log 

但是进入网页界面，它实际上是启动了 8 个工人。有两个父进程，每个进程有 4 个子进程。以下是进程的树视图：

ruby /code_base/bundle/ruby/1.9.1/bin/rake 环境 resque:workers RAILS_ENV=production COUNT=4 QUEUE=* VERBOSE=1 PIDFILE=tmp/pids/resque_worker.pid \_ [红宝石] \_ resque-1.15.0: 等待 * | \_ [红宝石] \_ resque-1.15.0: 等待 * | \_ [红宝石] \_ resque-1.15.0: 等待 * | \_ [红宝石] \_ resque-1.15.0: 等待 * \_ [红宝石] ruby /code_base/bundle/ruby/1.9.1/bin/rake 环境 resque:workers RAILS_ENV=production COUNT=4 QUEUE=* VERBOSE=1 PIDFILE=tmp/pids/resque_worker.pid \_ [红宝石] \_ resque-1.15.0: 等待 * | \_ [红宝石] \_ resque-1.15.0: 等待 * | \_ [红宝石] \_ resque-1.15.0: 等待 * | \_ [红宝石] \_ resque-1.15.0: 等待 * \_ [红宝石]

不知道是什么导致额外进程启动？

Answer 1

您不想在生产中使用 COUNT=n 选项，因为它在一个线程中而不是在一个单独的进程中运行每个工作线程 - 这不太稳定。

官方 Resque 文档：

Running Multiple Workers

At GitHub we use god to start and stop multiple workers. A sample god configuration file is included under examples/god. We recommend this method.

If you'd like to run multiple workers in development mode, you can do so using the resque:workers rake task:

$ COUNT=5 QUEUE=* rake resque:workers
This will spawn five Resque workers, each in its own process. Hitting ctrl-c should be sufficient to stop them all.

Here's the example God monitoring/configuration file 与 Resque 一起运行以运行多个进程，以及 here's an example for monit。