Introduction to Shared-Memroy:
    1--> Say what we will do today
    2--> Basic computer archeticture
    2--> multi-core machines
    3--> Multi-processor machine (NUMA Nodes)
    4--> What is a shared memory system?
    5--> Process Vs. Thread
        -> Whats address space?
    6--> Finally Whats OpenMP?
    7--> Fork-Join Model:
    8--> OpenMP Directives
        -> omp parallel direcive
        -> example: omp_greetings.c
    
    9--> OpenMP private clause:
        -> What is a clause: modify the behave of directives
        -> example: omp_greetings.c
        -> what happense if you try to print my_id, after the parallel block
    
    10-TD-> More about OpenMP data scopes
        -> different data control clauses exist:
            -> private, shared, default, firstprivate, lastprivate, threadprivate
        -> example: omp_data_scoping.c
    
    12-TD-> OpenMP runtime library routines
        -> omp_get_thread_num();  ->  omp_get_num_threads();
        -> omp_set_num_threads(); ->  omp_get_wtime()
        -> omp_get_num_procs(void); 
        -> omp_get_num_devices(void); //Returns the number of target devices.
        -> omp_get_wtick(void); // Gets the timer precision, i.e., the number of seconds between two successive clock ticks.
        -> examples: omp_functions.c
    
    13-TD-> OpenMP work load scheduling
        -> example: omp_compute_pi.c
        -> What are Schedule clause:
            -> schdule(type,chunk_size)
                -> type: static, dynamic, auto, runtime
                -> chunk_size: compute the load balance
            -> nowait clause
            -> use runtime library to see time different in different loop ordering

    14-TD-> OpenMP Syncronization.
        -> example: omp_critical.c   //compute pi, one sum update at a time.
        -> omp critical directive
        -> omp atomic
        -> reduction(+:sum)
    
    15-TD-> More OpenMP Environment variables:
        -> OMP_NUM_THREADS, OMP_SCHEDUEL(TYPE, CHUNK_SIZE)
        -> OMP_NOWAIT
        -> nested