Profiling

Chapter review from objc.io's Core Data book at Tumblr's iOS Book Club

Transcript

1. 13 - Profiling Core Data iOS Book Club Jasdev Singh
2. SQL Debug Output The easiest way to gain insight into what SQL is doing under the hood of Core Data is to enable debug output by adding -com.apple.CoreData.SQLDebug 1 as a launch argument in the Xcode Scheme Editor.
3. SQL Pro Tip Once you extract underlying queries from SQL, you can use SQL's EXPLAIN command to get a further breakdown on the execution plan for it.
4. Core Data Instruments Predefined templates include the Fetches, Saves, Faults, and Cache Misses instruments
5. Threading Guard Add the launch argument, - com.apple.CoreData.ConcurrencyDebug 1 to have Core Data throw an exception whenever a managed object or managed object context are accessed from the wrong queue.
6. Summary 4 Launch flags to help investigate issues 4 Pair SQL output with EXPLAIN 4 Core Data instruments are !