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selective_build.md

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Selective Build

Introduction

Selective build or conditional compilation can significantly reduce OpenVINO™ binaries size by excluding unnecessary components for particular model's inference.

Workflow

Onednn path in OpenVINO:

./src/plugins/intel_cpu/thirdparty/onednn/

The selective build carries on under the instruction of:

./src/common/conditional_compilation/CMakeLists.txt

First build

The first build collects the information and generate a CSV file indicating which components are going to be included and which are going to be excluded in the selected build.

  • For the first build, config cmake with option "-DENABLE_PROFILING_ITT=ON -DSELECTIVE_BUILD=COLLECT"
cd ./build

cmake .. \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_BUILD_TYPE=Release \
-DENABLE_CPU_DEBUG_CAPS=ON \
-DENABLE_PROFILING_ITT=ON \
-DSELECTIVE_BUILD=COLLECT \
-DCMAKE_INSTALL_PREFIX=`pwd`/install \
-DCMAKE_INSTALL_RPATH=`pwd`/install/runtime/3rdparty/tbb/lib:`pwd`/install/runtime/lib/intel64

cmake --build . --config Release -j 8

Generate statistics file (CSV):

  • Need to build manually to get libIntelSEAPI.so with the following step first.
# in ./build
cd ./thirdparty/itt_collector && make
  • Then generate statistics file (in .csv format).
cd ../../../bin/intel64/Release/

python ../../../thirdparty/itt_collector/runtool/sea_runtool.py \
--bindir ./lib -o models_statistics_dir ! \
./benchmark_app -niter 1 -nireq 1 \
-m <model_path>

Second build

The second build takes in the information in the statistics file and only build the components mentioned in the CSV file.

The generated CSV file could be found in folder:

openvino/bin/intel64/Release/

This time, config cmake with option "-DSELECTIVE_BUILD=ON"

cd ../../../build

cmake .. \
-DCMAKE_BUILD_TYPE=Release \
-DENABLE_CPU_DEBUG_CAPS=ON \
-DENABLE_DEBUG_CAPS=ON \
-DSELECTIVE_BUILD=ON \
-DSELECTIVE_BUILD_STAT=<CSV_PATH> \
-DPython3_EXECUTABLE=/usr/bin/python3.7 \
-DCMAKE_INSTALL_PREFIX=`pwd`/install \
-DCMAKE_INSTALL_RPATH=`pwd`/install/runtime/3rdparty/tbb/lib:`pwd`/install/runtime/lib/intel64

cmake --build . --config Release -j 8

As shown in

./src/common/conditional_compilation/CMakeLists.txt

CSV file works as a SELECTIVE_BUILD_STAT and is first interpreted into a c++ head file:

./build/src/common/conditional_compilation/conditional_compilation_gen.h

It is generated by 'ccheader.py' and can indicate if selective build analyze process (first build) works correctly.

Test selective compile with benchmark

cd ./bin/intel64/Release

./benchmark_app -niter 1 -nireq 1 \
-m <model_path> -d CPU

Reference

https://github.com/openvinotoolkit/openvino/blob/master/docs/dev/conditional_compilation.md

https://github.com/openvinotoolkit/openvino/commit/ec48fcb29bef94cca480573110a598afc3515019#

https://github.com/openvinotoolkit/openvino/commit/1f96ddfbf9030e765aa0ca0a6aafb1ae2b8c3e98#diff-de6f7126342889fe9d0b505b0ac391db2275400488d5bab9194c2542a4f4d1fe