I'll start with the minimal solution I came up with (as of macOS 11.4), and then give more of an explanation below.Īdd the following two files to /Library/LaunchDaemons: The next two biggest issues are hitting the system limits for open file descriptors, and open processes. Multiple simulators attempting to access the clipboard can cause deadlocks that leave them frozen.
You will see serious animation and UI slowdown when this is not selected. Simulator Settingsįile > GPU Selection > Prefer Discrete GPU I upgraded my build machines to M1 Mac Minis recently, and despite clearly having the CPU and memory headroom to run more simulators, I was getting strange errors (XPC daemon crashes, hangs, etc.) once I tried to push beyond about 5 simulators in parallel.įortunately, with some help from the Simulators team in a WWDC lab, I was able to figure out the issue and get a reliable setup of 10+ simulators running in parallel. I have a large UI test suite I run for Nihongo, and the more simulators I can run in parallel, the faster it can complete.
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