Unable to boot device due to insufficient system resources using Xcode 9

ios ios-simulator ios10 xcode9
Sandy picture Sandy · Oct 10, 2017 · Viewed 20.5k times · Source

When I try to launch an iOS Simulator from Xcode 9, the following error pops up:

"Unable to boot device due to insufficient system resources" error dialog

Answer

Tamás Sengel picture Tamás Sengel · Oct 10, 2017

You should increase the allowed running processes for your system. You can modify the limits through Terminal. The command for that is the following:

sudo launchctl limit maxproc [limit for one user] [total limit]

Inside Simulator Help, Apple's example values are 2000 for one user and 2500 total.

After setting up the values, quit iOS Simulator, then restart Xcode and try launching a simulated device again.

However, keep in mind that this can slow down your system and make the OS unstable. Since these values are only permanent until the next restart, you should reboot your system and it will restore these values to default.

From Simulator Help:

WARNING: Setting the the maximum number of processes to a number that is too low can prevent your Mac from operating correctly. Restart your machine to restore the original limits.

Related questions

Xcode 8 | iOS 10 simulator "Error returned in reply: Connection invalid"

While I am try to run an app in the iOS 10 simulator using xcode8 I get these alerts frequently. They randomly appear two at a time and it is not apparent what is triggering them. Below is Image for Error …

Read More
Take screenshots in the iOS simulator

I want to take a screenshot of my iOS application when it is running in the simulator, and save the screenshot on my Mac. How can I do this?

Read More
Is it possible to disable the network in iOS Simulator?

I am trying to debug some inconsistent behaviour I am seeing in an application that gets its primary data from the internet. I don't see the issues in the simulator, just on the device, so I'd like to reproduce the …

Read More