Rails，Heroku，Unicorn& Resque - 如何选择网络工作者/ resque工作者的数量？ [英] Rails, Heroku, Unicorn & Resque - how to choose the amount of web workers / resque workers?

问题描述

我刚刚转向在Heroku上使用独角兽。我也将切换到delayed_job的resque，并使用 http://bugsplat.info/2011-11-27-concurrency-on-heroku-cedar.html

我不明白从这是如何config / unicorn.rb：

  worker_processes 3 
超时30 
 
 @resque_pid = nil 
 
 before_fork | server，worker | 
 @resque_pid || = spawn（bundle exec rake+ \ 
resque：work QUEUES = scrape，geocode，distance，mailer）
 end 
  
 
 $ b 
 
 $ b 实际上在每个网络测试中会产生六个过程：1个独角兽主人，3个独角兽网络工作者，1个重新工作者，1个重新启动的童工，当它实际上正在处理一项工作时
 
有多少员工会实际处理后台工作？ 1或2？
 
 
可以说我想增加resque workers的数量 - 我会改变什么？
解决方案
我想如果你运行这个块，你的麒麟master已经在运行，再加上你在文件顶部指定的3个web worker，然后下面的块会启动一个Resque worker如果它还没有开始。
 
 
 
我猜Resque在实际执行工作时会自行启动一个子工作者。
 
 $ b $如果你想要另一个Resque worker，你可以这样做： 
 
 
  worker_processes 3 
 timeout 30 
 
 @resque_pid = nil 
 @ resque_pid2 = nil 
 
 before_fork do | server，worker | 
 @resque_pid || = spawn（bundle exec rake+ \ 
resque：work QUEUES = scrape，geocode，distance，mailer）
 @ resque_pid2 || = spawn（ bundle exec rake+ \ 
resque：work QUEUES = scrape，geocode，distance，mailer）
 end 
  
根据我对Resque的经验，就像启动上面指定的另一个过程一样简单。我所遇到的唯一不确定因素是Heroku以及它如何选择处理给你更多的工人。
 
I've just switched to using Unicorn on Heroku. I'm also going to switch to resque from delayed_job and use the setup described at http://bugsplat.info/2011-11-27-concurrency-on-heroku-cedar.html

What I don't understand from this is how config/unicorn.rb:
worker_processes 3
timeout 30

@resque_pid = nil

before_fork do |server, worker|
  @resque_pid ||= spawn("bundle exec rake " + \
  "resque:work QUEUES=scrape,geocode,distance,mailer")
end
translates into:

  
"This will actually result in six processes in each web dyno: 1 unicorn master, 3 unicorn web workers, 1 resque worker, 1 resque child worker when it actually is processing a job"
How many workers will actually process background jobs? 1 or 2?

Lets say I wanted to increase the number of resque workers - what would I change?
解决方案
I think if you run that block, you have your unicorn master already running, plus 3 web workers that you specify at the top of the file, and then the block below launches one Resque worker if it's not already started.

I'm guessing that Resque launches a child worker by itself when it actually performs work.

It would appear that if you wanted another Resque worker, you could just do
worker_processes 3
timeout 30

@resque_pid = nil
@resque_pid2 = nil

before_fork do |server, worker|
  @resque_pid ||= spawn("bundle exec rake " + \
  "resque:work QUEUES=scrape,geocode,distance,mailer")
  @resque_pid2 ||= spawn("bundle exec rake " + \
  "resque:work QUEUES=scrape,geocode,distance,mailer")
end
In my experience with Resque, it's as simple as launching another process as specified above. The only uncertainty I have is with Heroku and how it chooses to deal with giving you more workers.

                        
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