1. clone ncnn code
git clone https://github.com/Tencent/ncnn.git
cd ncnn
git submodule update --init
2. build
cd ncnn
mkdir -p build
cd build
sudo apt install build-essential git cmake libprotobuf-dev protobuf-compiler libvulkan-dev vulkan-utils libopencv-dev
cmake -DCMAKE_BUILD_TYPE=Release -DNCNN_VULKAN=ON -DNCNN_SYSTEM_GLSLANG=ON -DNCNN_BUILD_EXAMPLES=ON -DCMAKE_TOOLCHAIN_FILE=../toolchains/pi3.toolchain.cmake -DPI3=ON ..
遇到如下问题：
CMake Warning at CMakeLists.txt:163 (message): GLSLANG_TARGET_DIR must be defined! NCNN_SYSTEM_GLSLANG will be turned off. CMake Error at CMakeLists.txt:188 (message): The submodules were not downloaded! Please update submodules with "git submodule update --init" and try again. -- Configuring incomplete, errors occurred! See also "/home/pi/ncnn/ncnn_master/ncnn/build/CMakeFiles/CMakeOutput.log".这是因为部分依赖包不存在，再次运行
git submodule update --init即可
make -j4
3. test
Test1
build $ cd ../examples/
examples $ ../build/examples/squeezenet ../images/256-ncnn.png
Result
vkCreateInstance failed -9
vkCreateInstance failed -9
532 = 0.165951
920 = 0.094098
716 = 0.062193
Test2
examples $ cd ../benchmark/
benchmark $ ../build/benchmark/benchncnn 10 $(nproc) 0 -1
Result
loop_count = 10
num_threads = 4
powersave = 0
gpu_device = -1
cooling_down = 1
squeezenet min = 59.54 max = 78.24 avg = 61.93
squeezenet_int8 min = 68.22 max = 136.60 avg = 75.22
mobilenet min = 82.28 max = 103.96 avg = 86.50
mobilenet_int8 min = 102.12 max = 127.61 avg = 105.56
mobilenet_v2 min = 72.07 max = 78.58 avg = 73.41
mobilenet_v3 min = 58.79 max = 62.76 avg = 59.56
shufflenet min = 39.38 max = 39.76 avg = 39.56
shufflenet_v2 min = 30.91 max = 62.75 avg = 34.47
mnasnet min = 62.02 max = 63.65 avg = 63.10
proxylessnasnet min = 63.72 max = 78.89 avg = 65.54
efficientnet_b0 min = 97.13 max = 134.88 avg = 101.45
regnety_400m min = 78.38 max = 112.27 avg = 82.46
blazeface min = 11.84 max = 12.11 avg = 11.98
googlenet min = 175.91 max = 226.33 avg = 187.03
googlenet_int8 min = 160.86 max = 174.87 avg = 163.83
resnet18 min = 226.30 max = 256.77 avg = 231.41
resnet18_int8 min = 137.44 max = 172.20 avg = 144.58
alexnet min = 175.46 max = 187.97 avg = 178.70
vgg16 min = 966.03 max = 1200.06 avg = 1021.94
vgg16_int8 min = 1198.49 max = 1241.05 avg = 1216.26
resnet50 min = 466.87 max = 511.23 avg = 483.53
resnet50_int8 min = 332.21 max = 380.04 avg = 344.77
squeezenet_ssd min = 178.27 max = 232.75 avg = 187.56
squeezenet_ssd_int8 min = 195.93 max = 227.62 avg = 202.93
mobilenet_ssd min = 175.19 max = 197.45 avg = 182.97
mobilenet_ssd_int8 min = 172.96 max = 207.40 avg = 181.28
mobilenet_yolo min = 426.78 max = 526.93 avg = 463.47
mobilenetv2_yolov3 min = 248.95 max = 274.25 avg = 255.45
yolov4-tiny min = 329.52 max = 369.67 avg = 342.12
参考：