The goal of this exercise is to introduce you to the use of std::chrono to do some basic performance measurements.

The test program includes manually inserted calls to high_resolution_clock to retrieve the current time_point, which allows to measure the elapsed time between two points.

Build and run cputicks.cc:

cd esc15/hands-on/basic
c++ -std=c++14 -O -o cputicks cputicks.cc
./cputicks

Run the program a few times, possibly also with arguments:

./cputicks 100
./cputicks 1000

Why does test1() report much more time spent than test2()?
Why do the times reported by test1() fluctuate so much?
Do the times change if you change the optimization level of the compilation (-O0 through -O3)?

Basic profiling using std::chrono