我有一些非常简单的CUDA代码和自定义类：
这是自定义类：
#ifdef __CUDACC__
#define CUDA_CALLABLE_MEMBER __host__ __device__
#else
#define CUDA_CALLABLE_MEMBER
#endif
class Foo {
public:
int val;
CUDA_CALLABLE_MEMBER Foo() {
}
CUDA_CALLABLE_MEMBER ~Foo() {}
CUDA_CALLABLE_MEMBER int getVal() {
return val;
}
};
这是内核：
#include <cuda.h>
#include <cuda_runtime.h>
#include <stdio.h>
#include "Custom.h"
#include <string>
#include <iostream>
using namespace std;
__global__ void someKernel(int maxNumberOfThreads, Foo* fooArray, int n)
{
int idx = blockIdx.x*blockDim.x + threadIdx.x;
if (idx < n){
printf("Hello from thread # %i(block #: %i) with value %d\n",idx, blockIdx.x, fooArray[idx].val);
}
}
extern void cuda_doStuff(Foo* fooArray, int n)
{
int numberOfBlocks = 10;
int threadsPerBlock = 100;
int maxNumberOfThreads = 10;
someKernel << <numberOfBlocks, threadsPerBlock >> >(maxNumberOfThreads, fooArray, n);
cudaDeviceSynchronize();
}
这是我的主要课程：
#include <stdio.h>
#include "Custom.h"
#include <cuda.h>
#include <cuda_runtime_api.h>
#include <assert.h>
#include <iostream>
using namespace std;
extern void cuda_doStuff(Foo* fooArray, int n);
int main(int argc, const char* argv[])
{
int n = 100;
//Foo* fooArray = new Foo[n];
const unsigned int bytes = n*sizeof(Foo);
//Foo fooArray[1000];
Foo* fooArray = (Foo*)malloc(bytes);
for (int i = 0; i < n; i++){
fooArray[i].val = 0;
}
for (int i = 0; i < n; i++){
assert(fooArray[i].val == 0);
}
Foo* d_fooArray;
cudaMalloc((void**)& d_fooArray, bytes);
cudaError_t error = cudaMemcpy(d_fooArray, &fooArray, bytes, cudaMemcpyHostToDevice);
const char* cudaError = cudaGetErrorString(error);
cuda_doStuff(d_fooArray, n);
cudaFree(d_fooArray);
free(fooArray);
cout << cudaError << endl;
system("pause");
}
我通过输出得到一些随机数：
Hello from thread # 96(block #: 0) with value 1
Hello from thread # 97(block #: 0) with value 13068
Hello from thread # 98(block #: 0) with value 220
Hello from thread # 99(block #: 0) with value 0
Hello from thread # 0(block #: 0) with value 11187856
Hello from thread # 1(block #: 0) with value -858993460
Hello from thread # 16(block #: 0) with value 0
Hello from thread # 2(block #: 0) with value -858993460
Hello from thread # 3(block #: 0) with value 400
Hello from thread # 17(block #: 0) with value 2132037632
Hello from thread # 4(block #: 0) with value -858993460
Hello from thread # 5(block #: 0) with value -858993460
Hello from thread # 18(block #: 0) with value 0
Hello from thread # 6(block #: 0) with value 100
Hello from thread # 7(block #: 0) with value -858993460
Hello from thread # 8(block #: 0) with value -636130255
Hello from thread # 9(block #: 0) with value 7405308
Hello from thread # 19(block #: 0) with value 67324640
Hello from thread # 10(block #: 0) with value 14712953
Hello from thread # 11(block #: 0) with value 1
Hello from thread # 12(block #: 0) with value 11182328
Hello from thread # 13(block #: 0) with value 11165024
Hello from thread # 14(block #: 0) with value -636130207
Hello from thread # 15(block #: 0) with value 0
Hello from thread # 20(block #: 0) with value 0
Hello from thread # 21(block #: 0) with value 7405568
Hello from thread # 22(block #: 0) with value 0
Hello from thread # 23(block #: 0) with value 7405248
Hello from thread # 24(block #: 0) with value 0
Hello from thread # 25(block #: 0) with value 7405380
Hello from thread # 26(block #: 0) with value 14684685
Hello from thread # 27(block #: 0) with value -628844083
Hello from thread # 28(block #: 0) with value 0
Hello from thread # 29(block #: 0) with value 7405316
Hello from thread # 30(block #: 0) with value 14713453
Hello from thread # 31(block #: 0) with value 7405328
Hello from thread # 32(block #: 0) with value 1967343965
Hello from thread # 48(block #: 0) with value 1997345969
Hello from thread # 33(block #: 0) with value 2132037632
Hello from thread # 34(block #: 0) with value 7405396
Hello from thread # 49(block #: 0) with value -627052760
Hello from thread # 35(block #: 0) with value 1997052142
Hello from thread # 36(block #: 0) with value 2132037632
Hello from thread # 37(block #: 0) with value -1377334916
Hello from thread # 50(block #: 0) with value 0
Hello from thread # 38(block #: 0) with value 0
Hello from thread # 39(block #: 0) with value 0
Hello from thread # 51(block #: 0) with value 7405412
Hello from thread # 40(block #: 0) with value 2132037632
Hello from thread # 52(block #: 0) with value 1997052100
Hello from thread # 41(block #: 0) with value 0
Hello from thread # 42(block #: 0) with value 0
Hello from thread # 43(block #: 0) with value 1
Hello from thread # 44(block #: 0) with value 0
Hello from thread # 53(block #: 0) with value -1
Hello from thread # 45(block #: 0) with value 7405340
Hello from thread # 54(block #: 0) with value 1997005042
Hello from thread # 46(block #: 0) with value -8192
Hello from thread # 55(block #: 0) with value 0
Hello from thread # 47(block #: 0) with value 7405404
Hello from thread # 56(block #: 0) with value 0
Hello from thread # 57(block #: 0) with value 14685370
Hello from thread # 58(block #: 0) with value 2132037632
Hello from thread # 59(block #: 0) with value 0
Hello from thread # 60(block #: 0) with value 0
Hello from thread # 61(block #: 0) with value 0
Hello from thread # 62(block #: 0) with value 0
Hello from thread # 63(block #: 0) with value 0
Hello from thread # 64(block #: 0) with value 0
Hello from thread # 65(block #: 0) with value 0
Hello from thread # 66(block #: 0) with value 0
Hello from thread # 67(block #: 0) with value 0
Hello from thread # 68(block #: 0) with value 0
Hello from thread # 80(block #: 0) with value 0
Hello from thread # 69(block #: 0) with value 0
Hello from thread # 70(block #: 0) with value 0
Hello from thread # 81(block #: 0) with value 0
Hello from thread # 71(block #: 0) with value 0
Hello from thread # 72(block #: 0) with value 0
Hello from thread # 73(block #: 0) with value 0
Hello from thread # 74(block #: 0) with value 0
Hello from thread # 82(block #: 0) with value 0
Hello from thread # 75(block #: 0) with value 0
Hello from thread # 83(block #: 0) with value 0
Hello from thread # 76(block #: 0) with value 0
Hello from thread # 84(block #: 0) with value 0
Hello from thread # 77(block #: 0) with value 0
Hello from thread # 85(block #: 0) with value 0
Hello from thread # 78(block #: 0) with value 0
Hello from thread # 86(block #: 0) with value 0
Hello from thread # 79(block #: 0) with value 0
Hello from thread # 87(block #: 0) with value 0
Hello from thread # 88(block #: 0) with value 0
Hello from thread # 89(block #: 0) with value 0
Hello from thread # 90(block #: 0) with value 0
Hello from thread # 91(block #: 0) with value 0
Hello from thread # 92(block #: 0) with value 0
Hello from thread # 93(block #: 0) with value 0
Hello from thread # 94(block #: 0) with value 2020893505
Hello from thread # 95(block #: 0) with value 32
no error
Press any key to continue . . .
我尝试过双打，我也得到一些随机结果。有人知道为什么吗？
答案 0 :(得分：2)
此行导致问题：
class Home: SKScene {
let shapeNew2 = SKShapeNode()
var currentPoint = CGPoint(x: 0, y: 1024)
var happiness:CGFloat {
return currentPoint.y
}
override func didMoveToView(view: SKView) {
backgroundColor = UIColor.blueColor()
shapeNew2.strokeColor = UIColor.greenColor()
shapeNew2.lineWidth = 10
addChild(shapeNew2)
}
func drawhappiness() {
let pathNew2 = CGPathCreateMutable()
let startx:CGFloat = 268
let starty:CGFloat = 1024
let cp1x:CGFloat = 568
let cp1y:CGFloat = happiness
let cp2x:CGFloat = 968
let cp2y:CGFloat = happiness
let endx:CGFloat = 1292
let endy:CGFloat = 1024
CGPathMoveToPoint(pathNew2, nil, startx, starty)
CGPathAddCurveToPoint(pathNew2, nil, cp1x, cp1y, cp2x, cp2y, endx, endy)
shapeNew2.path = pathNew2
}
override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) {
for touch:AnyObject in touches {
currentPoint = touch.locationInNode(self)
}
}
override func update(currentTime: NSTimeInterval) {
drawhappiness()
}
}
您正在将指针的地址作为第二个参数传递。 相反它必须是指针本身：
cudaError_t error = cudaMemcpy(d_fooArray, &fooArray, bytes, cudaMemcpyHostToDevice);