27. Instruments
Instruments is a framework for software-measurement tools called. . . instruments. (Capital-I Instruments is the application, small-i instruments are components of the Instruments application.) The analogy is to a multi-track recording deck. Instruments records activity into tracks (one per instrument), building the data on a timeline like audio on a tape.
You’ve seen Instruments before, in Chapter 16, “Measurement and Analysis,” where it helped you track down some memory and performance bugs in the Passer Rating iPhone app. It deserves a closer look. You’ll learn how to navigate the Instruments trace window, and how to choose instruments to fit your needs.
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