This is the documentation for the latest (main) development branch. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

Performance Optimization

Better Performance

  • Change the default compilation optimization level to -O2 or -O3. Note that increasing the compiler optimization level may increase firmware size and expose previously undetected errors.

  • Move frequently executed code to SRAM to reduce XIP execution loading wait time. Use ATTRIBUTE_IRAM to modify a single function, or specify it for an entire file in components\wm_system\ld\code_in_ram.ld.h .

  • Reduce logging overhead by setting the default log level to ERROR or below.

  • Disable heap memory and FreeRTOS debug statistics features.

  • Adjust FreeRTOS task priorities reasonably.

  • Improve interrupt performance by minimizing the use of interrupt enable/disable for critical section protection.

  • Increase network speed by referring to the iperf example and maximizing available cache and configuration in the WiFi driver and TCP/IP stack.

  • Re-enable jump table optimization to improve hot path performance in large switch cases. Add the compilation parameters -fjump-tables -ftree-switch-conversion during compilation.

  • Avoid using floating-point operations (float and double) in the program, as floating-point calculations are always slower than integer operations.

Additionally, there may be more ways to improve application performance based on usage scenarios, which users should choose flexibly.

Better Size

  • Disable unused features in various components by menuconfig.

  • Choose the -Os optimization level during compilation, which is the default selection.

  • Analyze the size occupancy by viewing the map file after compilation. The map file is located in the project build folder.