326 lines
9.1 KiB
Plaintext
326 lines
9.1 KiB
Plaintext
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#include <iostream>
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#include <fstream>
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#include <vector>
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#include <chrono>
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#include <cfloat>
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#include <cmath>
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#include <cuda.h>
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#include "common.h"
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std::string getDeviceName(int device);
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// Code to check CUDA errors
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void check_cuda_error(void)
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{
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cudaError_t err = cudaGetLastError();
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if (err != cudaSuccess)
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{
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std::cerr
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<< "Error: "
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<< cudaGetErrorString(err)
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<< std::endl;
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exit(err);
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}
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}
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template <typename T>
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__global__ void copy(const T * a, T * c)
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{
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const int i = blockDim.x * blockIdx.x + threadIdx.x;
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c[i] = a[i];
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}
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template <typename T>
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__global__ void mul(T * b, const T * c)
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{
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const T scalar = 3.0;
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const int i = blockDim.x * blockIdx.x + threadIdx.x;
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b[i] = scalar * c[i];
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}
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template <typename T>
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__global__ void add(const T * a, const T * b, T * c)
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{
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const int i = blockDim.x * blockIdx.x + threadIdx.x;
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c[i] = a[i] + b[i];
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}
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template <typename T>
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__global__ void triad(T * a, const T * b, const T * c)
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{
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const T scalar = 3.0;
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const int i = blockDim.x * blockIdx.x + threadIdx.x;
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a[i] = b[i] + scalar * c[i];
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}
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int main(int argc, char *argv[])
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{
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// Print out run information
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std::cout
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<< "GPU-STREAM" << std::endl
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<< "Version: " << VERSION_STRING << std::endl
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<< "Implementation: CUDA" << std::endl;
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parseArguments(argc, argv);
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if (NTIMES < 2) throw badntimes();
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std::cout << "Precision: ";
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if (useFloat) std::cout << "float";
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else std::cout << "double";
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std::cout << std::endl << std::endl;
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if (ARRAY_SIZE % 1024 != 0)
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{
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unsigned int OLD_ARRAY_SIZE = ARRAY_SIZE;
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ARRAY_SIZE -= ARRAY_SIZE % 1024;
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std::cout
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<< "Warning: array size must divide 1024" << std::endl
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<< "Resizing array from " << OLD_ARRAY_SIZE
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<< " to " << ARRAY_SIZE << std::endl;
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}
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// Get precision (used to reset later)
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std::streamsize ss = std::cout.precision();
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size_t DATATYPE_SIZE;
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if (useFloat)
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{
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DATATYPE_SIZE = sizeof(float);
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}
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else
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{
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DATATYPE_SIZE = sizeof(double);
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}
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// Display number of bytes in array
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std::cout << std::setprecision(1) << std::fixed
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<< "Array size: " << ARRAY_SIZE*DATATYPE_SIZE/1024.0/1024.0 << " MB"
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<< " (=" << ARRAY_SIZE*DATATYPE_SIZE/1024.0/1024.0/1024.0 << " GB)"
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<< std::endl;
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std::cout << "Total size: " << 3.0*ARRAY_SIZE*DATATYPE_SIZE/1024.0/1024.0 << " MB"
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<< " (=" << 3.0*ARRAY_SIZE*DATATYPE_SIZE/1024.0/1024.0/1024.0 << " GB)"
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<< std::endl;
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// Reset precision
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std::cout.precision(ss);
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// Check device index is in range
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int count;
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cudaGetDeviceCount(&count);
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check_cuda_error();
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if (deviceIndex >= count) throw invaliddevice();
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cudaSetDevice(deviceIndex);
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check_cuda_error();
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// Print out device name
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std::cout << "Using CUDA device " << getDeviceName(deviceIndex) << std::endl;
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// Create host vectors
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void * h_a = malloc(ARRAY_SIZE*DATATYPE_SIZE);
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void * h_b = malloc(ARRAY_SIZE*DATATYPE_SIZE);
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void * h_c = malloc(ARRAY_SIZE*DATATYPE_SIZE);
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// Initilise arrays
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for (unsigned int i = 0; i < ARRAY_SIZE; i++)
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{
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if (useFloat)
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{
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((float*)h_a)[i] = 1.0;
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((float*)h_b)[i] = 2.0;
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((float*)h_c)[i] = 0.0;
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}
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else
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{
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((double*)h_a)[i] = 1.0;
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((double*)h_b)[i] = 2.0;
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((double*)h_c)[i] = 0.0;
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}
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}
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// Create device buffers
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void * d_a, * d_b, *d_c;
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cudaMalloc(&d_a, ARRAY_SIZE*DATATYPE_SIZE);
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check_cuda_error();
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cudaMalloc(&d_b, ARRAY_SIZE*DATATYPE_SIZE);
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check_cuda_error();
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cudaMalloc(&d_c, ARRAY_SIZE*DATATYPE_SIZE);
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check_cuda_error();
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// Copy host memory to device
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cudaMemcpy(d_a, h_a, ARRAY_SIZE*DATATYPE_SIZE, cudaMemcpyHostToDevice);
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check_cuda_error();
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cudaMemcpy(d_b, h_b, ARRAY_SIZE*DATATYPE_SIZE, cudaMemcpyHostToDevice);
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check_cuda_error();
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cudaMemcpy(d_c, h_c, ARRAY_SIZE*DATATYPE_SIZE, cudaMemcpyHostToDevice);
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check_cuda_error();
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// Make sure the copies are finished
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cudaDeviceSynchronize();
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check_cuda_error();
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// List of times
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std::vector< std::vector<double> > timings;
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// Declare timers
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std::chrono::high_resolution_clock::time_point t1, t2;
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// Main loop
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for (unsigned int k = 0; k < NTIMES; k++)
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{
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std::vector<double> times;
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t1 = std::chrono::high_resolution_clock::now();
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if (useFloat)
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copy<<<ARRAY_SIZE/1024, 1024>>>((float*)d_a, (float*)d_c);
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else
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copy<<<ARRAY_SIZE/1024, 1024>>>((double*)d_a, (double*)d_c);
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check_cuda_error();
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cudaDeviceSynchronize();
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check_cuda_error();
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t2 = std::chrono::high_resolution_clock::now();
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times.push_back(std::chrono::duration_cast<std::chrono::duration<double> >(t2 - t1).count());
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t1 = std::chrono::high_resolution_clock::now();
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if (useFloat)
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mul<<<ARRAY_SIZE/1024, 1024>>>((float*)d_b, (float*)d_c);
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else
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mul<<<ARRAY_SIZE/1024, 1024>>>((double*)d_b, (double*)d_c);
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check_cuda_error();
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cudaDeviceSynchronize();
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check_cuda_error();
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t2 = std::chrono::high_resolution_clock::now();
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times.push_back(std::chrono::duration_cast<std::chrono::duration<double> >(t2 - t1).count());
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t1 = std::chrono::high_resolution_clock::now();
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if (useFloat)
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add<<<ARRAY_SIZE/1024, 1024>>>((float*)d_a, (float*)d_b, (float*)d_c);
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else
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add<<<ARRAY_SIZE/1024, 1024>>>((double*)d_a, (double*)d_b, (double*)d_c);
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check_cuda_error();
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cudaDeviceSynchronize();
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check_cuda_error();
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t2 = std::chrono::high_resolution_clock::now();
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times.push_back(std::chrono::duration_cast<std::chrono::duration<double> >(t2 - t1).count());
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t1 = std::chrono::high_resolution_clock::now();
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if (useFloat)
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triad<<<ARRAY_SIZE/1024, 1024>>>((float*)d_a, (float*)d_b, (float*)d_c);
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else
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triad<<<ARRAY_SIZE/1024, 1024>>>((double*)d_a, (double*)d_b, (double*)d_c);
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check_cuda_error();
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cudaDeviceSynchronize();
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check_cuda_error();
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t2 = std::chrono::high_resolution_clock::now();
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times.push_back(std::chrono::duration_cast<std::chrono::duration<double> >(t2 - t1).count());
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timings.push_back(times);
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}
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// Check solutions
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cudaMemcpy(h_a, d_a, ARRAY_SIZE*DATATYPE_SIZE, cudaMemcpyDeviceToHost);
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check_cuda_error();
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cudaMemcpy(h_b, d_b, ARRAY_SIZE*DATATYPE_SIZE, cudaMemcpyDeviceToHost);
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check_cuda_error();
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cudaMemcpy(h_c, d_c, ARRAY_SIZE*DATATYPE_SIZE, cudaMemcpyDeviceToHost);
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check_cuda_error();
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if (useFloat)
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{
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check_solution<float>(h_a, h_b, h_c);
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}
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else
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{
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check_solution<double>(h_a, h_b, h_c);
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}
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// Crunch results
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size_t sizes[4] = {
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2 * DATATYPE_SIZE * ARRAY_SIZE,
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2 * DATATYPE_SIZE * ARRAY_SIZE,
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3 * DATATYPE_SIZE * ARRAY_SIZE,
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3 * DATATYPE_SIZE * ARRAY_SIZE
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};
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double min[4] = {DBL_MAX, DBL_MAX, DBL_MAX, DBL_MAX};
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double max[4] = {0.0, 0.0, 0.0, 0.0};
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double avg[4] = {0.0, 0.0, 0.0, 0.0};
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// Ignore first result
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for (unsigned int i = 1; i < NTIMES; i++)
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{
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for (int j = 0; j < 4; j++)
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{
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avg[j] += timings[i][j];
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min[j] = std::min(min[j], timings[i][j]);
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max[j] = std::max(max[j], timings[i][j]);
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}
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}
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for (int j = 0; j < 4; j++)
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avg[j] /= (double)(NTIMES-1);
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// Display results
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std::string labels[] = {"Copy", "Mul", "Add", "Triad"};
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std::cout
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<< std::left << std::setw(12) << "Function"
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<< std::left << std::setw(12) << "MBytes/sec"
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<< std::left << std::setw(12) << "Min (sec)"
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<< std::left << std::setw(12) << "Max"
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<< std::left << std::setw(12) << "Average"
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<< std::endl;
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for (int j = 0; j < 4; j++)
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{
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std::cout
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<< std::left << std::setw(12) << labels[j]
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<< std::left << std::setw(12) << std::setprecision(3) << 1.0E-06 * sizes[j]/min[j]
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<< std::left << std::setw(12) << std::setprecision(5) << min[j]
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<< std::left << std::setw(12) << std::setprecision(5) << max[j]
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<< std::left << std::setw(12) << std::setprecision(5) << avg[j]
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<< std::endl;
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}
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}
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std::string getDeviceName(int device)
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{
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struct cudaDeviceProp prop;
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cudaGetDeviceProperties(&prop, device);
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check_cuda_error();
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return std::string(prop.name);
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}
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void listDevices(void)
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{
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// Get number of devices
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int count;
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cudaGetDeviceCount(&count);
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check_cuda_error();
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// Print device names
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if (count == 0)
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{
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std::cout << "No devices found." << std::endl;
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}
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else
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{
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std::cout << std::endl;
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std::cout << "Devices:" << std::endl;
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for (int i = 0; i < count; i++)
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{
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std::cout << i << ": " << getDeviceName(i) << std::endl;
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check_cuda_error();
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}
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std::cout << std::endl;
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}
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}
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