Re: Exception `Errno::EAGAIN'

[James Turnbull <james@lovedthanlost.net>]

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Eric Wong wrote:
> This is expected.  The kernel wakes up all the workers when there's
> _one_ connection and they all race to accept() one client connection.
> One wins and accepts the connection, 3 lose and go back to sleep.  With
> lots of worker processes, this can be a thundering herd problem but
> that's why we encourage Unicorn as a backend server, not as a frontend
> server.

Ah okay - makes sense.

> Do you by any chance do user switching in your application
> or config.ru?

In the application we do.

> Instead, since 0.94.0, I would do this:
> 
> 	after_fork do |server, worker|
> 	  worker.user('user', 'group') if Process.euid == 0
> 	end
> 
> That way only the worker process drops permissions.  The master really
> doesn't do anything interesting.   Of course *I* would just start
> Unicorn as a regular user and forget the complexity of user switching
> entirely...

Okay thanks - will give that a shot.

Regards

James Turnbull

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