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173 lines
6.8 KiB
Plaintext
173 lines
6.8 KiB
Plaintext
/* Copyright (c) 2021, NVIDIA CORPORATION. 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
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (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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* Example of integrating CUDA functions into an existing
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* application / framework.
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* Host part of the device code.
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* Compiled with Cuda compiler.
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*/
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// System includes
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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 <assert.h>
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// CUDA runtime
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#include <cuda_runtime.h>
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// helper functions and utilities to work with CUDA
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#include <helper_cuda.h>
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#include <helper_functions.h>
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#ifndef MAX
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#define MAX(a, b) (a > b ? a : b)
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#endif
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////////////////////////////////////////////////////////////////////////////////
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// declaration, forward
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extern "C" void computeGold(char *reference, char *idata,
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const unsigned int len);
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extern "C" void computeGold2(int2 *reference, int2 *idata,
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const unsigned int len);
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///////////////////////////////////////////////////////////////////////////////
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//! Simple test kernel for device functionality
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//! @param g_odata memory to process (in and out)
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///////////////////////////////////////////////////////////////////////////////
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__global__ void kernel(int *g_data) {
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// write data to global memory
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const unsigned int tid = threadIdx.x;
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int data = g_data[tid];
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// use integer arithmetic to process all four bytes with one thread
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// this serializes the execution, but is the simplest solutions to avoid
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// bank conflicts for this very low number of threads
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// in general it is more efficient to process each byte by a separate thread,
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// to avoid bank conflicts the access pattern should be
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// g_data[4 * wtid + wid], where wtid is the thread id within the half warp
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// and wid is the warp id
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// see also the programming guide for a more in depth discussion.
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g_data[tid] =
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((((data << 0) >> 24) - 10) << 24) | ((((data << 8) >> 24) - 10) << 16) |
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((((data << 16) >> 24) - 10) << 8) | ((((data << 24) >> 24) - 10) << 0);
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}
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///////////////////////////////////////////////////////////////////////////////
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//! Demonstration that int2 data can be used in the cpp code
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//! @param g_odata memory to process (in and out)
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///////////////////////////////////////////////////////////////////////////////
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__global__ void kernel2(int2 *g_data) {
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// write data to global memory
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const unsigned int tid = threadIdx.x;
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int2 data = g_data[tid];
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// use integer arithmetic to process all four bytes with one thread
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// this serializes the execution, but is the simplest solutions to avoid
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// bank conflicts for this very low number of threads
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// in general it is more efficient to process each byte by a separate thread,
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// to avoid bank conflicts the access pattern should be
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// g_data[4 * wtid + wid], where wtid is the thread id within the half warp
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// and wid is the warp id
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// see also the programming guide for a more in depth discussion.
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g_data[tid].x = data.x - data.y;
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}
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////////////////////////////////////////////////////////////////////////////////
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//! Entry point for Cuda functionality on host side
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//! @param argc command line argument count
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//! @param argv command line arguments
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//! @param data data to process on the device
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//! @param len len of \a data
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////////////////////////////////////////////////////////////////////////////////
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extern "C" bool runTest(const int argc, const char **argv, char *data,
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int2 *data_int2, unsigned int len) {
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// use command-line specified CUDA device, otherwise use device with highest
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// Gflops/s
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findCudaDevice(argc, (const char **)argv);
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const unsigned int num_threads = len / 4;
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assert(0 == (len % 4));
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const unsigned int mem_size = sizeof(char) * len;
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const unsigned int mem_size_int2 = sizeof(int2) * len;
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// allocate device memory
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char *d_data;
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checkCudaErrors(cudaMalloc((void **)&d_data, mem_size));
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// copy host memory to device
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checkCudaErrors(cudaMemcpy(d_data, data, mem_size, cudaMemcpyHostToDevice));
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// allocate device memory for int2 version
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int2 *d_data_int2;
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checkCudaErrors(cudaMalloc((void **)&d_data_int2, mem_size_int2));
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// copy host memory to device
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checkCudaErrors(cudaMemcpy(d_data_int2, data_int2, mem_size_int2,
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cudaMemcpyHostToDevice));
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// setup execution parameters
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dim3 grid(1, 1, 1);
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dim3 threads(num_threads, 1, 1);
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dim3 threads2(len, 1, 1); // more threads needed fir separate int2 version
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// execute the kernel
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kernel<<<grid, threads>>>((int *)d_data);
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kernel2<<<grid, threads2>>>(d_data_int2);
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// check if kernel execution generated and error
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getLastCudaError("Kernel execution failed");
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// compute reference solutions
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char *reference = (char *)malloc(mem_size);
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computeGold(reference, data, len);
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int2 *reference2 = (int2 *)malloc(mem_size_int2);
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computeGold2(reference2, data_int2, len);
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// copy results from device to host
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checkCudaErrors(cudaMemcpy(data, d_data, mem_size, cudaMemcpyDeviceToHost));
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checkCudaErrors(cudaMemcpy(data_int2, d_data_int2, mem_size_int2,
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cudaMemcpyDeviceToHost));
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// check result
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bool success = true;
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for (unsigned int i = 0; i < len; i++) {
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if (reference[i] != data[i] || reference2[i].x != data_int2[i].x ||
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reference2[i].y != data_int2[i].y) {
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success = false;
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}
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}
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// cleanup memory
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checkCudaErrors(cudaFree(d_data));
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checkCudaErrors(cudaFree(d_data_int2));
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free(reference);
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free(reference2);
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return success;
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}
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