.. zephyr:code-sample:: system_hashmap
:name: System hashmap
:relevant-api: hashmap_apis
Insert, replace, and remove entries in a hashmap.
Overview
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This is a simple example that repeatedly:
* inserts up to ``CONFIG_TEST_LIB_HASH_MAP_MAX_ENTRIES``
* replaces up to the same number that were previously inserted
* removes all previously inserted keys
Building
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This application can be built on :ref:`native_sim <native_sim>` as follows:
.. zephyr-app-commands::
:zephyr-app: samples/basic/hash_map
:host-os: unix
:board: native_sim
:goals: build
:compact:
To build for another board, change "native_sim" 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``.
Running
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Run ``build/zephyr/zephyr.exe``
Sample Output
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.. code-block:: console
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
388f82f6b3