Instruments: Profiling Your App in Practice
summary
Instruments 27 exposes 63 instruments and the demo profiles a command‑line Swift package (Swift Evolution Metadata Extractor) to show real results: Swift 62 task naming appears in the Swift Tasks track, URLSession fetches map to continuations, and adding a few lines of OSLog signposts pins exact intervals in the timeline. Time Profiler validates markdown parsing cost, XC‑Test measure runs the test 10 times and shows a memoized Fibonacci drop from ~236 ms to ~988 ns using XC test performance.
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chapters (16)
- 0:00Introduction and welcome
- 1:55About the speaker and location
- 3:03Instruments 27 overview
- 5:30Beyond performance profiling
- 7:22Profiling a Swift package
- 9:09Swift concurrency tools
- 12:12Analyzing task timelines
- 18:16Time profiler insights
- 19:28Debugging vs profiling
- 23:08Caveman debugging vs profiling
- 24:13Adding standard out to Instruments
- 28:00Using signposts for precision
- 32:52Narrowing focus in timelines
- 33:59XC test performance testing
- 36:55Comparing algorithms
- 39:24Key takeaways and practice
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