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77 lines
2.4 KiB
Text
77 lines
2.4 KiB
Text
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/*
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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 exercise1.c
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* @author Alessandro Capotondi
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* @date 27 Mar 2020
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* @brief Exercise 1
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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 <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <cuda_runtime.h>
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/**
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* @brief EX 1 - Launch CUDA kernel to "print" helloworld
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*
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* a) Detect global thread id. (tip: use threadIdx.x, blockDim.x, and blockIdx.x)
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* b) Explore thread execution and schedule changing: N={8, 16, 32} and M={4,8,16}
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*
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* @return void
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*/
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__global__ void helloworld(void)
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{
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int gid = threadIdx.x + blockDim.x * blockIdx.x;
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printf("Hello world, I am global thread %d (threadIdx=%d, blockIdx=%d, blockDim=%d)\n",
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gid, threadIdx.x, blockIdx.x, blockDim.x);
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}
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#ifndef N
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#define N 8
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#endif
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#ifndef BLOCK_SIZE
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#define BLOCK_SIZE 4
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#endif
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int main(int argc, const char **argv)
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{
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helloworld<<<N / BLOCK_SIZE, BLOCK_SIZE>>>();
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// CUDA exit -- needed to flush printf write buffer
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cudaDeviceReset();
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return 0;
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}
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