Xcode 9 Server: Unable to boot device due to insufficient system resources : <p>I'm trying to run my unit tests on all device simulators from iOS 8.4 to 11.0 at the same time by checking the option 'Run test in parallel' when setting up the Xcode Bot. Unfortunately after trying to boot the 13th simulator it failes with the error message in the build log:</p>

<pre><code>xcodebuild: error: Failed to build workspace xxxxx with scheme yyyyy.
Reason: Unable to boot device due to insufficient system resources.
Testing failed on 'iPhone 4s'
</code></pre>

<p>I'm running the server on a mac mini and i think it is just not capable to run so many simulators at the same time due to full memory.</p>

<p>Anyone experience with it?</p>
