How do I find memory issues?

To find memory issues, you can use several tools and techniques discussed in the Analyze heap memory session at WWDC 2024. Here are the key steps and tools:

Xcode Memory Report: This tool shows an application's memory footprint over time, which can help identify large memory issues. However, it doesn't explain why memory use is growing.
Malloc Stack Logging: Enable this in Xcode's scheme diagnostics tab. It helps track memory usage by providing backtraces for each allocation.
Memory Graph Debugger: This captures memory graphs, which are snapshots of all allocations and their references. It's useful for focusing on specific allocations and is accessible from Xcode's debug bar.
Instruments Application: Use the Allocations instrument to record the history of all allocation and free events over time. The Leaks instrument takes periodic snapshots to detect memory leaks.
Analyzing Spikes: To diagnose transient memory growth, look at memory spikes in your app. Select a spike interval in the timeline and sort the allocations by total bytes to identify top contributors. Use call trees to break down allocations by backtrace and find the code responsible for the allocations.
Persistent Memory Growth: Persistent memory is memory that doesn't get deallocated. Use the memory graph debugger to identify and fix persistent growth by examining the allocations that remain over time.
Reachability: Ensure all memory in your program is reachable through non-weak references. Identify and fix abandoned or leaked memory, which can be caused by reference cycles or lost pointers.

For a detailed walkthrough, you can refer to the following chapters in the session:

These resources should help you effectively find and address memory issues in your application.