C 随机函数中的误差
我的代码有错误-我得到错误。“错误:预期为a”)”C 随机函数中的误差,c,random,cuda,syntax-error,C,Random,Cuda,Syntax Error,我的代码有错误-我得到错误。“错误:预期为a”)” #include <assert.h> #include <cuda.h> #include <stdio.h> #include <stdlib.h> #include <stddef.h> #include <time.h> #define N (1024*1024) #define M (1000000) void random_ints(int *a, int
#include <assert.h>
#include <cuda.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <time.h>
#define N (1024*1024)
#define M (1000000)
void random_ints(int *a, int N)
{
int i;
for (i = 0; i < M; ++i)
a[i] = rand() %5000;
}
__global__ void add(int *a, int *b, int *c) {
c[blockIdx.x] = a[blockIdx.x] + b[blockIdx.x];
}
int main(void) {
int *a, *b, *c; // host copies of a, b, c
int *d_a, *d_b, *d_c; // device copies of a, b, c
int size = N * sizeof(int);
// Alloc space for device copies of a, b, c
cudaMalloc((void **)&d_a, size);
cudaMalloc((void **)&d_b, size);
cudaMalloc((void **)&d_c, size);
// Alloc space for host copies of a, b, c and setup input values
a = (int *)malloc(size); random_ints(a, N);
b = (int *)malloc(size); random_ints(b, N);
c = (int *)malloc(size);
// Copy inputs to device
cudaMemcpy(d_a, a, size, cudaMemcpyHostToDevice);
cudaMemcpy(d_b, b, size, cudaMemcpyHostToDevice);
// Launch add() kernel on GPU with N blocks
add<<<N,1>>>(d_a, d_b, d_c);
// Copy result back to host
cudaMemcpy(c, d_c, size, cudaMemcpyDeviceToHost);
// Cleanup
free(a); free(b); free(c);
cudaFree(d_a); cudaFree(d_b); cudaFree(d_c);
return 0;
}
此错误是由于随机输入函数引起的
#include <assert.h>
#include <cuda.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <time.h>
#define N (1024*1024)
#define M (1000000)
void random_ints(int *a, int N)
{
int i;
for (i = 0; i < M; ++i)
a[i] = rand() %5000;
}
__global__ void add(int *a, int *b, int *c) {
c[blockIdx.x] = a[blockIdx.x] + b[blockIdx.x];
}
int main(void) {
int *a, *b, *c; // host copies of a, b, c
int *d_a, *d_b, *d_c; // device copies of a, b, c
int size = N * sizeof(int);
// Alloc space for device copies of a, b, c
cudaMalloc((void **)&d_a, size);
cudaMalloc((void **)&d_b, size);
cudaMalloc((void **)&d_c, size);
// Alloc space for host copies of a, b, c and setup input values
a = (int *)malloc(size); random_ints(a, N);
b = (int *)malloc(size); random_ints(b, N);
c = (int *)malloc(size);
// Copy inputs to device
cudaMemcpy(d_a, a, size, cudaMemcpyHostToDevice);
cudaMemcpy(d_b, b, size, cudaMemcpyHostToDevice);
// Launch add() kernel on GPU with N blocks
add<<<N,1>>>(d_a, d_b, d_c);
// Copy result back to host
cudaMemcpy(c, d_c, size, cudaMemcpyDeviceToHost);
// Cleanup
free(a); free(b); free(c);
cudaFree(d_a); cudaFree(d_b); cudaFree(d_c);
return 0;
}
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#定义N(1024*1024)
#定义M(1000000)
无效随机整数(整数*a,整数N)
{
int i;
对于(i=0;i
此函数是否需要任何标题,或者只是语法错误?请考虑在解释
\define
宏后如何定义随机输入:
void random_ints(int *a, int (1024*1024))
{
int i;
for (i = 0; i < 1000000; ++i)
a[i] = rand() %5000;
}
我强烈建议对数值常量使用静态常量int N=…
而不是#define N…
。使用define很容易在您最不期望的位置导致难以理解的错误。假设“此错误是由于随机函数引起的”“是准确的,man 3 rand
告诉您使用#include
。看起来你的标题是对的。您的函数似乎有输入错误。函数参数为N
,但您在循环中使用了M
。