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<a href="src_2dynamic_2_r_e_a_d_m_e_8md.xhtml">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> # Standalone dynamic backend developer guide</div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> Arm NN allows adding new dynamic backends. Dynamic Backends can be compiled as standalone against Arm NN</div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> and can be loaded by Arm NN dynamically at runtime.</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> </div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> To be properly loaded and used, the backend instances must comply to the standard interface for dynamic backends </div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> and to the versioning rules that enforce ABI compatibility.</div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> The details of how to add dynamic backends can be found in [src/backends/README.md](../backends/README.md).</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> ## Standalone dynamic backend example</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> The source code includes an example that is used to generate a simple dynamic backend and is provided at</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> [SampleDynamicBackend.hpp](./sample/SampleDynamicBackend.hpp)</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> [SampleDynamicBackend.cpp](./sample/SampleDynamicBackend.cpp)</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> The details of how to create backends can be found in [src/backends/README.md](../backends/README.md).</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> The makefile used for building the standalone reference dynamic backend is also provided:</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> [CMakeLists.txt](./sample/CMakeLists.txt)</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> ### Standalone dynamic backend build</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> The easiest way to build a standalone sample dynamic backend is to build using environment configured compiler</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> and specify the Arm NN path and Boost path to the CMake command:</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> ```shell</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> cd ${DYNAMIC_BACKEND_DIR}</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> mkdir build</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> cd build</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> cmake -DBOOST_ROOT=${BOOST_PATH} \</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  -DBoost_SYSTEM_LIBRARY=${BOOST_PATH}/lib/libboost_system.a \</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  -DARMNN_PATH=${ARMNN_PATH}/libarmnn.so ..</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> ```</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> Then run the build</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> ```shell</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> make</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> ```</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> The library will be created in ${DYNAMIC_BACKEND_DIR}/build.</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> ## Dynamic backend loading paths</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> During the creation of the Runtime, Arm NN will scan a given set of paths searching for suitable dynamic backend objects to load.</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> A list of (absolute) paths can be specified at compile-time by setting a define named ```DYNAMIC_BACKEND_PATHS```</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  in the form of a colon-separated list of strings.</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> ```shell</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> -DDYNAMIC_BACKEND_PATHS="PATH_1:PATH_2...:PATH_N"</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> ```</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> Example for setting the path to the sample standalone dynamic backend built from the previous step:</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> ```shell</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> -DDYNAMIC_BACKEND_PATHS=${DYNAMIC_BACKEND_DIR}/build</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> ```</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> The paths will be processed in the same order as they are indicated in the macro.</div></div><!-- fragment --></div><!-- contents -->
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