Run Concurrently (using different ports?) about headless HOT 5 OPEN

@leonid-shevtsov @Lordnibbler
I can confirm that there is issue to run scripts which uses selenium+headless concurrently.
I've writed small script which reproduces that kind of error:
http://pastebin.com/96h2WEuf
To reproduce error:
run the script in two different consoles, first with command line parameter "10" (without quotes), second with command line parameter "1". Then see what's happening after second script finish.

Looks like using different display numbers solves this issue.
But I think in that case it's better to run Xvfb one time before starting ruby scripts, there is no need to start/stop Xvfb which is performed when you executing headless.start / headless.destroy (destroy also occurs on_exit automatically)

from headless.

Does using Headless.new(autopick: true) in the sidekick worker solve your problem? That should choose the first available display number.

(BTW, the error is from Selenium, not Xvfb, and it means that Selenium failed to boot - this might be caused by missing Xvfb, but other things too - like a Selenium port conflict.)

from headless.

@leonid-shevtsov isn't autopick: true the default?

It would seem that passing display: key will conflict with the autopick settings.

I do have Xvfb installed, and do not have this error when running a single thread, only when I introduce concurrent workers.

from headless.

How do you start your Selenium? Do you specify different ports for each Selenium instance?

from headless.

@leonid-shevtsov simply like this:

def driver
  @driver ||= Selenium::WebDriver.for :firefox
end

should I be specifying a unique port each time if I am running on concurrent workers?

from headless.