It can help expose data races or other threading conditions, but it is something to be aware of.
#Ios emulator slowing mac mac
Mac also has different number of cores, different threading behavior. If you try that on an iPhone X, that probably isn't going to work.
#Ios emulator slowing mac simulator
The memory and CPU limits of Simulator are or rather, the memory and CPU limits of the devices are not simulated, so if your Mac has you have one of the new Mac Pros and you have a terabyte of memory, your simulator can allocate a terabyte of memory. It uses the ABI for that platform, and it's built natively for your Mac's processor. It does share the same filesystem but has a separate Home directory.įrom libSystem up, everything is built for the platform that we're simulating, so that includes, at the lowest layers, you know, libSystem, all the Syslibs all the way up to UIKit and other frameworks. Has a separate launchd, separate daemons and services, separate notifications domains, separate URL sessions, separate mach bootstrap. So at a technical level, what a Simulator is is the iOS, watchOS or tvOS userspace but running on the Mac kernel. It's isolated not only from the macOS userspace but also from any other running Simulators. These things are all completely separate and isolated from your Mac's userspace.Īnd if I start another Simulator, that essentially brings up another isolated userspace. It has its own launchd, its own daemons, its own frameworks and runs its own applications. Simulator is essentially a separate userspace. We have some frameworks, and then we run our applications. We might have some daemons running on top of that, some services. MacOS then on top of that has a userspace. We have a kernel, manages hardware resources, allocates memory, arbitrates between processes. So to talk really about what the Simulator is at a technical level, we need to talk a little bit about what an operating system is. So it is a great tool, but as an engineer, that explanation might be a little bit unsatisfying. You can run multiple devices in parallel. It can be an amazing tool for development. Well, it is the best way to simulate iOS, tvOS and watchOS devices on your Mac. I'm going to come back and tell you about using Simulator from the command line, and then finally Katelyn's going to come and tell you all about Metal in the Simulator. Then Tracy is going to come out and tell you about some burning questions and answers and getting the most out of the Simulator application. Today we're going to tell you a little bit about what the Simulator is. I'm an engineer on the Simulator and Devices team. Welcome to Getting the Most out of Simulator.
#Ios emulator slowing mac how to
Learn about native GPU acceleration in Simulator via Metal, and how to optimize your Metal code to take advantage of it. Find out how Simulator works, discover features you might not know exist, and get a tour of the command-line interface to Simulator for automation. Getting the Most Out of Simulator Session 418 WWDC 2019 Join us for a deep dive into the world of Simulator.
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