Re: Thread.current

[Curtis j Schofield <curtis.schofield@gmail.com>]

On Fri, Jan 7, 2011 at 6:00 PM, Jimmy Soho <jimmy.soho@gmail.com> wrote:
> Hi All,
>
> Having an akward noob moment... I have unicorn_rails (1.1.5) running
> with 2 workers, with rails 2.3.10 in development mode. In
> environment.rb at the bottom I have this line of code:
>
>    puts "#{Time.current} #{Thread.current.object_id}:
> #{Thread.current.keys.inspect}"
>
> In a simple controller I have this:
>
>   def index
>     puts "#{Time.current} #{Thread.current.object_id}:
> #{Thread.current.keys.inspect}"
>     sleep 5
>     puts "#{Time.current} #{Thread.current.object_id}:
> #{Thread.current.keys.inspect}"
>     render :text => "foo"
>   end
>
> In window 1 I tail log/unicorn.log.
> In windows 2 and 3 I start at about the same time:  curl http://localhost:3000
>
> The output is this:
>
> 2011-01-08 01:53:56 UTC 2148444460: [:__inspect_key__, :i18n_config,
> :__recursive_key__]
> worker=1 ready
> 2011-01-08 01:53:56 UTC 2148444460: [:__inspect_key__, :i18n_config,
> :__recursive_key__]
> worker=0 ready
> 2011-01-08 01:53:57 UTC 2148444460: [:__inspect_key__, :i18n_config,
> :__recursive_key__]
> 2011-01-08 01:53:59 UTC 2148444460: [:__inspect_key__, :i18n_config,
> :__recursive_key__]
> 2011-01-08 01:54:02 UTC 2148444460: [:__inspect_key__, :i18n_config,
> :__recursive_key__]
> 2011-01-08 01:54:04 UTC 2148444460: [:__inspect_key__, :i18n_config,
> :__recursive_key__]
>
> Looking at the timings the 2 requests seem to have been handled in
> parallel, as expected.
>
> However, the Thread.current value within those parallel requests is
> always the same.
>
> Are two separate requests not handled by different threads? How does that work??
>


Unicorn is a multi-process model with Inter-process communication -
more akin to a unix service - threads are not considered a wise
investment in the ruby community.

Worker1 / Worker0 are entirely separate processes - as is the master
unicorn process.

Review  Fork for more details.

http://en.wikipedia.org/wiki/Fork_(operating_system)
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