请教一个demo

[cai123321cai]

#include <stdio.h>
#include <stdlib.h>
#include <cutil_inline.h>

__global__ static void HelloCUDA(char* result, char *d_HelloCUDA)
{
	int tid = threadIdx.x + blockIdx.x * 5;
	result[tid] = d_HelloCUDA[tid];
}


int main(int argc, char* argv[])
{

	char	*device_result	= 0;
	char	*d_HelloCUDA = 0;
	char	host_result[63]	={0};
	char	h_HelloCUDA[] = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

	cutilSafeCall( cudaMalloc((void**) &device_result, sizeof(char) * sizeof(host_result)));
	cutilSafeCall( cudaMalloc((void**) &d_HelloCUDA, sizeof(char) * sizeof(h_HelloCUDA)));
	cutilSafeCall( cudaMemcpy(d_HelloCUDA,h_HelloCUDA, sizeof(char) * sizeof(h_HelloCUDA), cudaMemcpyHostToDevice));



	HelloCUDA<<<2, 5, 0>>>(device_result,d_HelloCUDA);
	cutilCheckMsg("Kernel execution failed\n");

	cudaThreadSynchronize();

	cutilSafeCall( cudaMemcpy(host_result, device_result, sizeof(char) * 62, cudaMemcpyDeviceToHost));
	printf("%s\n", host_result);

	cutilSafeCall( cudaFree(device_result));

	return 0;
}

返回很奇怪，
abcdefghijpqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
开头10字节 空5字节
问题是后面的为什么都输出了？

我只调用了10个线程啊，他应该只执行10次，

这到底是为什么啊？

[lizecn]

1。修改各数组长度一致
2。 malloc host_result,试一下

[cai123321cai]

多谢大侠

测试通过