Chapter 6.3 : The CMakeLists.txt file

Let's write the CMakeLists.txt file.



Ordinary, we call the add_executable function from CMake and we can compile our program easily. But, for this tutorial, we want to compare the different compilation options of the compiler (here GCC/G++).

So, we will compile the same code (main.cpp) several times to compare the different execution performances :



We will test different compilation optimisation option which are ordered from the lower to the higher level of optimisation :

  • hadamard_product_O0 to test the -O0 option.
  • hadamard_product_O1 to test the -O1 option.
  • hadamard_product_O2 to test the -O2 option.
  • hadamard_product_O3 to test the -O3 option.
  • hadamard_product_Ofast to test the -Ofast option.


And we will call our runExample function to run all the programs (or targets).

We will create all these targets in the CMakeLists.txt :

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project(HadamardProduct)
cmake_minimum_required(VERSION 3.0)

add_executable(hadamard_product_O0 main.cpp)
set_property(TARGET hadamard_product_O0 PROPERTY COMPILE_FLAGS "-O0")
target_link_libraries(hadamard_product_O0 asterics_hpc)
runExample(hadamard_product_O0)

add_executable(hadamard_product_O1 main.cpp)
set_property(TARGET hadamard_product_O1 PROPERTY COMPILE_FLAGS "-O1")
target_link_libraries(hadamard_product_O1 asterics_hpc)
runExample(hadamard_product_O1)

add_executable(hadamard_product_O2 main.cpp)
set_property(TARGET hadamard_product_O2 PROPERTY COMPILE_FLAGS "-O2")
target_link_libraries(hadamard_product_O2 asterics_hpc)
runExample(hadamard_product_O2)

add_executable(hadamard_product_O3 main.cpp)
set_property(TARGET hadamard_product_O3 PROPERTY COMPILE_FLAGS "-O3")
target_link_libraries(hadamard_product_O3 asterics_hpc)
runExample(hadamard_product_O3)

add_executable(hadamard_product_Ofast main.cpp)
set_property(TARGET hadamard_product_Ofast PROPERTY COMPILE_FLAGS "-Ofast")
target_link_libraries(hadamard_product_Ofast asterics_hpc)
runExample(hadamard_product_Ofast)


Finally, we have to call our plotPerf to compare their performances :

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project(HadamardProduct)
cmake_minimum_required(VERSION 3.0)

add_executable(hadamard_product_O0 main.cpp)
set_property(TARGET hadamard_product_O0 PROPERTY COMPILE_FLAGS "-O0")
target_link_libraries(hadamard_product_O0 asterics_hpc)
runExample(hadamard_product_O0)

add_executable(hadamard_product_O1 main.cpp)
set_property(TARGET hadamard_product_O1 PROPERTY COMPILE_FLAGS "-O1")
target_link_libraries(hadamard_product_O1 asterics_hpc)
runExample(hadamard_product_O1)

add_executable(hadamard_product_O2 main.cpp)
set_property(TARGET hadamard_product_O2 PROPERTY COMPILE_FLAGS "-O2")
target_link_libraries(hadamard_product_O2 asterics_hpc)
runExample(hadamard_product_O2)

add_executable(hadamard_product_O3 main.cpp)
set_property(TARGET hadamard_product_O3 PROPERTY COMPILE_FLAGS "-O3")
target_link_libraries(hadamard_product_O3 asterics_hpc)
runExample(hadamard_product_O3)

add_executable(hadamard_product_Ofast main.cpp)
set_property(TARGET hadamard_product_Ofast PROPERTY COMPILE_FLAGS "-Ofast")
target_link_libraries(hadamard_product_Ofast asterics_hpc)
runExample(hadamard_product_Ofast)

plotPerf("hadamardBase" hadamard_product_O0 hadamard_product_O1 hadamard_product_O2 hadamard_product_O3 hadamard_product_Ofast)