Method

In parallel execution, each processor on the system is utilized for calculating a specific chunk of the matrix multiplication.
My system has 4 physical cores and 8 logical processors (via Hyper-Threading), therefore std::thread::hardware_concurrency() indicates that up to 8 threads can run in parallel on my system.

Build Steps

1-) Create and navigate to build directory

mkdir build    
cd build      

2-) Generate Makefile

• Windows:

cmake -G "MinGW Makefiles" .. 

• Unix-like systems:

cmake .. 

3-) Run make command

• Windows:

mingw32-make 

• Unix-like systems:

make 

Sample Result on Ubuntu

Sample Result on Windows