Chapter 3.3 : Compilation



Si nous nous positionnons à la racine du projet nous devons créer un dossier pour compiler :

mkdir build


Puis nous allons dedans :

cd build


Nous appelons cmake :

cmake ..
-- The C compiler identification is GNU 9.3.0
-- The CXX compiler identification is GNU 9.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- LIBRARY_DIRECTORY = ''
-- SELF_TESTS_MODE = yes
-- Found MICROBENCHMARK headers : usr/include/MicroBenchmark
-- Found lib MICROBENCHMARK : usr/lib
-- Found DATASTREAM headers : usr/include/DataStream
-- Found lib DATASTREAM : usr/lib
-- Found TENSORALLOC headers : usr/include/TensorAlloc
-- Found lib TENSORALLOC : usr/lib
-- Found STRINGUTILS headers : usr/include/StringUtils
-- Found lib STRINGUTILS : usr/lib
-- Found FILEPARSER headers : usr/include/FileParser
-- Found lib FILEPARSER : usr/lib
-- Found OPTIONPARSER headers : usr/include/OptionParser
-- Found lib OPTIONPARSER : usr/lib
-- Found INTRINSICSGENERATOR headers : usr/include/IntrinsicsGenerator
-- Automatic searching for architecture flags
-- Get LINUX extensions
-- Find SSSE3
-- Find SSE4
-- Find AVX
-- Find AVX2
-- tmp FLAG_VECTORIZED_COMPILATION = -mavx2
-- global PHOENIX_FLAG_VECTORIZED_COMPILATION = -mavx2
-- Automatic searching for architecture flags
-- Get LINUX extensions
-- Find SSSE3
-- Find SSE4
-- Find AVX
-- Find AVX2
-- CMAKE_VERSION = 3.16.3, MODE_NUNBER = '5'
-- CPU_MODEL_NAME =  Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
-- CPU_SIBLINGS =  8
-- NB_CORE = 4
-- CACHE_L1_DATA = 32768 B
-- CACHE_L1_INSTRUCTION = 32768 B
-- CACHE_L2 = 262144 B
-- CACHE_L3 = 8388608 B
-- ENDIANESS = LittleEndian
-- Configuring done
-- Generating done
-- Build files have been written to: PerfWithNan/build


Comme toujours, cmake nous donne quelques informations :
  • la version du compilateur qu'il a trouvé


La bibliothèquee de MicroBenchmark nous donne d'autres informations plus techniques :
  • les extensions présentes sur l'architecture (SSSE3, SSE4, AVX, AVX2)
  • le model du CPU et sa fréquence d'horloge
  • la taille des caches L1i, L1d, L2 et L3
  • l'endianess de l'architecture (qui ne nous servira pas dans ce cours car nous ne sauvegarderons pas de données binaires)


Enfin nous compilons :

make -j 8


Ce qui donne :

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[ 49%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_base_O0.dir/main_generic.cpp.o
[ 49%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_vectorize_nan_01_O3.dir/main_generic.cpp.o
[ 49%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_vectorize_make_denorm_001_O3.dir/main_generic.cpp.o
[ 49%] Linking CXX executable hadamard_product_base_denorm_025_O3
[ 49%] Built target hadamard_product_base_denorm_025_O3
Scanning dependencies of target hadamard_product_intrinsics_Ofast
[ 50%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_intrinsics_Ofast.dir/hadamard_product_intrinsics.cpp.o
[ 50%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_vectorize_nan_075_O3.dir/main_generic.cpp.o
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Scanning dependencies of target hadamard_product_vectorize_Ofast
[ 52%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_vectorize_Ofast.dir/hadamard_product_vectorize.cpp.o
[ 52%] Linking CXX executable hadamard_product_base_O0
[ 52%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_intrinsics_Ofast.dir/main_generic.cpp.o
[ 52%] Linking CXX executable hadamard_product_vectorize_nan_1_O3
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[ 52%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_vectorize_Ofast.dir/main_generic.cpp.o
[ 54%] Linking CXX executable hadamard_product_intrinsics_O2
[ 54%] Built target hadamard_product_vectorize_nan_1_O3
Scanning dependencies of target hadamard_product_intrinsics_nan_01_O3
[ 56%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_intrinsics_nan_01_O3.dir/hadamard_product_intrinsics.cpp.o
[ 56%] Built target hadamard_product_intrinsics_O2
Scanning dependencies of target hadamard_product_vectorize_nan_001_O3
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Scanning dependencies of target hadamard_product_intrinsics_denorm_025_O3
[ 56%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_intrinsics_denorm_025_O3.dir/hadamard_product_intrinsics.cpp.o
[ 56%] Linking CXX executable hadamard_product_vectorize_make_denorm_001_O3
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Scanning dependencies of target hadamard_product_intrinsics_nan_05_O3
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[ 56%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_intrinsics_nan_05_O3.dir/main_generic.cpp.o
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Scanning dependencies of target hadamard_product_vectorize_make_denorm_01_O3
[ 56%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_vectorize_make_denorm_01_O3.dir/hadamard_product_vectorize.cpp.o
[ 56%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_intrinsics_nan_01_O3.dir/main_generic.cpp.o
[ 56%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_vectorize_nan_001_O3.dir/main_generic.cpp.o
[ 56%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_intrinsics_denorm_025_O3.dir/main_generic.cpp.o
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[ 58%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_vectorize_make_denorm_01_O3.dir/main_generic.cpp.o
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Scanning dependencies of target hadamard_product_intrinsics_nan_1_O3
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Scanning dependencies of target hadamard_product_intrinsics_make_denorm_05_O3
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[ 58%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_intrinsics_make_denorm_05_O3.dir/main_generic.cpp.o
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[ 60%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_base_denorm_09_O3.dir/hadamard_product_base.cpp.o
[ 61%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_intrinsics_nan_1_O3.dir/main_generic.cpp.o
[ 61%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_base_denorm_09_O3.dir/main_generic.cpp.o
[ 61%] Linking CXX executable hadamard_product_intrinsics_nan_01_O3
Scanning dependencies of target hadamard_product_base_denorm_001_O3
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Scanning dependencies of target hadamard_product_base_denorm_05_O3
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Scanning dependencies of target hadamard_product_base_nan_01_O3
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Scanning dependencies of target hadamard_product_base_denorm_075_O3
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Scanning dependencies of target hadamard_product_base_denorm_1_O3
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[ 67%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_base_denorm_05_O3.dir/main_generic.cpp.o
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Scanning dependencies of target hadamard_product_vectorize_make_denorm_075_O3
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[ 70%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_vectorize_make_denorm_075_O3.dir/hadamard_product_vectorize.cpp.o
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Scanning dependencies of target hadamard_product_base_nan_001_O3
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[ 81%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_vectorize_denorm_09_O3.dir/main_generic.cpp.o
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Scanning dependencies of target hadamard_product_intrinsics_nan_075_O3
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[ 96%] Building CXX object Examples/1-HadamardProduct/CMakeFiles/hadamard_product_intrinsics_denorm_05_O3.dir/main_generic.cpp.o
Scanning dependencies of target hadamard_product_intrinsics_denorm_075_O3
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[100%] Built target hadamard_product_intrinsics_denorm_075_O3


Voilà, nous avons compiler le projet.

Nous voyons clairement qu'il n'était pas raisonnable d'écrire des sources différentes pour chacun des tests de performance.