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

System Hashmap


This is a simple example that repeatedly


  • replaces up to the same number that were previously inserted

  • removes all previously inserted keys


This application can be built on native_posix as follows:

west build -b native_posix samples/basic/hash_map

To build for another board, change “native_posix” above to that board’s name.

Additionally, it is possible to use one of the other Hashmap implementations by specifying

  • CONFIG_SYS_HASH_MAP_CHOICE_SC=y (Separate Chaining)

  • CONFIG_SYS_HASH_MAP_CHOICE_OA_LP=y (Open Addressing / Linear Probe)

  • CONFIG_SYS_HASH_MAP_CHOICE_CXX=y (C Wrapper around the C++ std::unordered_map)

To stress the Hashmap implementation, adjust CONFIG_TEST_LIB_HASH_MAP_MAX_ENTRIES.


Run build/zephyr/zephyr.exe

Sample Output

System Hashmap sample

[00:00:11.000,000] <inf> hashmap_sample: n_insert: 118200 n_remove: 295500 n_replace: 329061 n_miss: 0 n_error: 0 max_size: 118200
[00:00:11.010,000] <inf> hashmap_sample: success