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106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/*
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* BSD 2-Clause License
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*
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* Copyright (c) 2020, Alessandro Capotondi
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file exercise6.c
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* @author Alessandro Capotondi
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* @date 27 Mar 2020
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* @brief Exercise 6
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*
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* @see https://dolly.fim.unimore.it/2019/course/view.php?id=152
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*/
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#include <stdio.h>
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#include <omp.h>
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#include "utils.h"
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#if !defined(W)
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#define W (1 << 15)
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#endif
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/**
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* @brief EX 6 - Task Parallelism w/tasks
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*
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* a) Create a parallel region with 4 threads. Use SINGLE directive to allow only one thread to execute the loop. Use TASK directive to outline tasks.
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* b) Change number of iterations to 1024 and W to 1000000. Parallelize with TASK directive.
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* c) Same setup as b): parallelize with SINGLE instead of TASK. Comment on ease of coding and performance of the various parallelization schemes.
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*
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* @return void
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*/
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void exercise()
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{
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unsigned int i;
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#if 0 //Wrong!
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#pragma omp parallel num_threads(4)
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for(i=0; i<4; i++)
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{
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#pragma omp single nowait
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{
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DEBUG_PRINT("%hu: I am executing iteration %hu!\n", omp_get_thread_num(), i);
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work((i+1)*W);
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}
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}
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/*
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*./exercise6.exe
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*
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*
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*============================
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*Test - Iteration 0...
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*============================
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*0: I am executing iteration 0!
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*3: I am executing iteration 3!
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*2: I am executing iteration 2!
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*1: I am executing iteration 1!
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*
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*
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*============================
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*Test - Iteration 1...
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*============================
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*0: I am executing iteration 2!
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*3: I am executing iteration 2!
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*2: I am executing iteration 3!
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*1: I am executing iteration 3!
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*/
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#endif
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#if 1
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#pragma omp parallel num_threads(4)
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#pragma omp single nowait
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for (i = 0; i < 4; i++)
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{
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#pragma omp task
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{
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DEBUG_PRINT("%hu: I am executing iteration %hu!\n", omp_get_thread_num(), i);
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work((i + 1) * W);
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}
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}
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#endif
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}
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