How to profile application for hangs?

To profile an application for hangs, you can use the tools provided in Xcode, specifically the Instruments tool. Here are the steps you can follow:

1. Access Instruments: You can access Instruments from the profile action right within Xcode.

2. Use the Time Profiler Instrument: The Time Profiler instrument is particularly useful for visualizing CPU usage in your code and measuring how long different parts of your code take to run. This can help you identify hangs during the app's launch or other operations.

3. Set the Inspection Range: Once you have a trace of your app's launch, you can set the inspection range to the hang interval. This allows you to focus on the portion of the trace where the hang occurs.

4. Analyze the Data: Use the new flame graph feature in Instruments 16, which provides a high-level overview of the trace execution. This can help you narrow down the problem by visualizing which parts of your code are consuming the most CPU.

For more detailed steps and a visual demonstration, you can refer to the session "What’s new in Xcode 16" at the timestamp 18:46.

Additionally, the Thread Performance Checker in Xcode can help identify main thread hangs and other performance issues. This tool surfaces runtime issues and pinpoints the exact line of code to focus on, even if the issue isn't reproducing locally.

For more information on using the Thread Performance Checker, you can refer to the session "What’s new in Xcode 16" at the timestamp 10:06.

Relevant Sessions

1. What’s new in Xcode 16
2. Analyze heap memory
3. Xcode essentials
4. Explore Swift performance