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The constants NUM_THREADS, NUM_ITERATIONS, and CACHE_LINE_SIZE control the program. NUM_THREADS specifies the number of threads to use, NUM_ITERATIONS specifies the number of times to increment each counter, and CACHE_LINE_SIZE specifies the size of a cache line. The checkRuntime() function measures the runtime of the program by taking the difference between the start and end times and printing the result in milliseconds.
The main function first prints the cache line size. It then runs the increment functions for NUM_ITERATIONS using a single thread, measures the runtime, and prints the values of the counters. It then runs the increment functions using multiple threads, measures the runtime, and prints the values of the counters.
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