I want to compile a simple CUDA programm;
#include "stdafx.h"
#include <stdio.h>
#include <cuda.h>
#include <cutil.h>
// Kernel that executes on the CUDA device
__global__ void square_array(float *a, int N)
{
#define STRIDE 32
#define OFFSET 0
#define GROUP_SIZE 512
int n_elem_per_thread = N / (gridDim.x * blockDim.x);
int block_start_idx = n_elem_per_thread * blockIdx.x * blockDim.x;
int thread_start_idx = block_start_idx
+ (threadIdx.x / STRIDE) * n_elem_per_thread * STRIDE
+ ((threadIdx.x + OFFSET) % STRIDE);
int thread_end_idx = thread_start_idx + n_elem_per_thread * STRIDE;
if(thread_end_idx > N) thread_end_idx = N;
int group = (threadIdx.x / GROUP_SIZE) & 1;
for(int idx=thread_start_idx; idx < thread_end_idx; idx+=STRIDE)
{
if(!group) a[idx] = a[idx] * a[idx];
else a[idx] = a[idx] + a[idx];
}
}
// main routine that executes on the host
int main(void)
{
float *a_h, *a_d; // Pointer to host & device arrays
const int N = 1<<25; // Make a big array with 2**N elements
size_t size = N * sizeof(float);
a_h = (float *)malloc(size); // Allocate array on host
cudaMalloc((void **) &a_d, size); // Allocate array on device
// Initialize host array and copy it to CUDA device
for (int i=0; i<N; i++) a_h[i] = (float)i;
cudaMemcpy(a_d, a_h, size, cudaMemcpyHostToDevice);
// Create timer for timing CUDA calculation
unsigned int timer = 0;
cutCreateTimer( &timer );
// Set number of threads and blocks
int n_threads_per_block = 1<<9; // 512 threads per block
int n_blocks = 1<<10; // 1024 blocks
// Do calculation on device
cutStartTimer( timer ); // Start timer
square_array <<< n_blocks, n_threads_per_block >>> (a_d, N);
cudaThreadSynchronize(); // Wait for square_array to finish on CUDA
cutStopTimer( timer ); // Stop timer
// Retrieve result from device and store it in host array
cudaMemcpy(a_h, a_d, sizeof(float)*N, cudaMemcpyDeviceToHost);
// Print some of the results and the CUDA execution time
for (int i=0; i<N; i+=N/50) printf("%d %f\n", i, a_h[i]);
printf("CUDA execution time = %f ms\n",cutGetTimerValue( timer ));
// Cleanup
free(a_h); cudaFree(a_d);
}
but I canno’t compile it with nvcc:
$ nvcc example.cu
cc1plus: error: cuda_runtime.h: No such file or directory
example.cu:4:20: error: stdafx.h: No such file or directory
example.cu:7:18: error: cuda.h: No such file or directory
example.cu:8:19: error: cutil.h: No such file or directory
CUDA Driver and SDK (in /usr/cuda/) should be properly installed.
$ nvcc -V
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2010 NVIDIA Corporation
Built on Wed_Nov__3_16:16:57_PDT_2010
Cuda compilation tools, release 3.2, V0.2.1221
$PATH has /usr/cuda/bin
$LD_LIBRARY_PATH has /usr/cuda/lib
System is Redhat with 2.6.32 Kernel, NVidia Driver 260.19.44, Card; GeForce 8600 GT