Monitoring startup time
- The pre-main stage was monitored by DYLD
DYLD_PRINT_STATISTICS
Dylid Loading Time: loading time of the dynamic library
Rebase: fix offset, binding: external function symbol binding
Objc Setup Time: time for OC class registration
, initializer time:
The solution
The project reduced the number of dynamic libraries by more than six merged dynamic libraries and discarded useless classes in the project
- Cold start
The process of loading data from disk into physical memory
- Warm start
Data exists in physical memory, and the process of reading physical memory is started
Optimization scheme
- Off-screen rendering
- Multithreaded asynchronous loading
- Optimize the executable
Item loading sequence
The executable file of the project is lazily loaded into physical memory on a page basis
- Lazy loading: When the system accesses virtual memory and data is not loaded into physical memory, the system throws PageFult and data is loaded into physical memory as pages