Jimmy Soho <[email protected]> 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}"
Add the PID ($$), too:
puts "#{Time.current} #$$ #{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.
Yes, that's because you have two worker *processes*
> However, the Thread.current value within those parallel requests is
> always the same.
Just a lucky coincidence :)
> Are two separate requests not handled by different threads? How does
> that work??
Threads (and any other object) object_ids are unique to each process.
They are not unique within all the processes of a machine.
When dealing with native threads under Linux, gettid() is a non-portable
Linux syscall to get the unique identifier of a thread throughout the
entire system. That's the only way I know of if you want a single
unique identifier (and of course prepending the PID to it).
--
Eric Wong
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