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Increasing Kernel limits on OS X

On some machines, iOS Simulator tests can run faster once kernel limits are increased. The run-webkit-tests script prints out a warning when it is the case.

In order to increase the limits for number of processes and number of files, save the attached plist files into /Library/LaunchDaemons/ and reboot the system.

On OS X El Capitan and later, you will also need to disable System Integrity Protection.

To check the limits use "ulimit -a" or "launchctl limit maxproc".

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