hpc-2022-g3/openmp/lab1/.solutions/exercise7.c

/*
 * BSD 2-Clause License
 * 
 * Copyright (c) 2020, Alessandro Capotondi
 * All rights reserved.
 * 
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/**
 * @file exercise7.c
 * @author Alessandro Capotondi
 * @date 27 Mar 2020
 * @brief Exercise 7
 * 
 * @see https://dolly.fim.unimore.it/2019/course/view.php?id=152
 */

#include <stdio.h>
#include <omp.h>

#include "utils.h"

#if !defined(W)
#define W (1000)
#endif

#if !defined(T)
#define T (20)
#endif

/**
 * @brief EX 7 - Task Parallelism w/tasks
 * 
 * a) Parallelize with TASK directive.
 * b) Parallelize with SINGLE NOWAIT directive.
 * c) Compare Results with a for loop.
 * @return void
 */
void exercise()
{
    unsigned int i;

#if 1
#pragma omp parallel
#pragma omp single nowait
    for (i = 0; i < 16384; i++)
    {
#pragma omp task
        {
            DEBUG_PRINT("%hu: I am executing iteration %hu!\n", omp_get_thread_num(), i);
            work(W);
        }
    }
#endif

#if 0
#pragma omp parallel
    for (i = 0; i < 16384; i++)
    {
#pragma omp single nowait
        {
            DEBUG_PRINT("%hu: I am executing iteration %hu!\n", omp_get_thread_num(), i);
            work(W);
        }
    }
#endif

#if 0
#pragma omp parallel for
    for (i = 0; i < 16384; i++)
    {
        DEBUG_PRINT("%hu: I am executing iteration %hu!\n", omp_get_thread_num(), i);
        work(W);
    }
#endif
}