估计还是环境或者是什么没设置好

加速计算 CUDA
1

cuda by example第四章那个Julia的程序：
#include “…/common/book.h”
#include “…/common/cpu_bitmap.h”
#define DIM 1000
struct cuComplex {
float r;
float i;
cuComplex( float a, float b ) : r(a), i(b) {}
device float magnitude2( void ) {
return r * r + i * i;
}
device cuComplex operator*(const cuComplex& a) {
return cuComplex(ra.r - ia.i, ia.r + ra.i);
}
device cuComplex operator+(const cuComplex& a) {
return cuComplex(r+a.r, i+a.i);
}
};
device int julia( int x, int y ) {
const float scale = 1.5;
float jx = scale * (float)(DIM/2 - x)/(DIM/2);
float jy = scale * (float)(DIM/2 - y)/(DIM/2);
cuComplex c(-0.8, 0.156);
cuComplex a(jx, jy);
int i = 0;
for (i=0; i<200; i++) {
a = a * a + c;
if (a.magnitude2() > 1000)
return 0;
}
return 1;
}
global void kernel( unsigned char ptr ) {
// map from blockIdx to pixel position
int x = blockIdx.x;
int y = blockIdx.y;
int offset = x + y * gridDim.x;
// now calculate the value at that position
int juliaValue = julia( x, y );
ptr[offset4 + 0] = 255 * juliaValue;
ptr[offset4 + 1] = 0;
ptr[offset4 + 2] = 0;
ptr[offset*4 + 3] = 255;
}
// globals needed by the update routine
struct DataBlock {
unsigned char dev_bitmap;
};
int main( void ) {
DataBlock data;
CPUBitmap bitmap( DIM, DIM, &data );
unsigned char dev_bitmap;
HANDLE_ERROR( cudaMalloc( (void)&dev_bitmap, bitmap.image_size() ) );
data.dev_bitmap = dev_bitmap;
dim3 grid(DIM,DIM);
kernel<<<grid,1>>>( dev_bitmap );
HANDLE_ERROR( cudaMemcpy( bitmap.get_ptr(), dev_bitmap,
bitmap.image_size(),
cudaMemcpyDeviceToHost ) );
HANDLE_ERROR( cudaFree( dev_bitmap ) );
bitmap.display_and_exit();
}
错误是：
1>G:/CUDA/code/julia2/julia2/kernel.cu(27): error : calling a host function(“cuComplex::cuComplex”) from a device function(“julia”) is not allowed
1>
1>G:/CUDA/code/julia2/julia2/kernel.cu(28): error : calling a host function(“cuComplex::cuComplex”) from a device function(“julia”) is not allowed
1>
1>G:/CUDA/code/julia2/julia2/kernel.cu(15): error : calling a host function(“cuComplex::cuComplex”) from a device function(“cuComplex::operator *”) is not allowed
1>
1>G:/CUDA/code/julia2/julia2/kernel.cu(18): error : calling a host function(“cuComplex::cuComplex”) from a device function(“cuComplex::operator +”) is not allowed

是不是又有哪里没设置好啊

2

晕，那个::o是一个::和一个o，被系统辨认成表情了

3

楼主您好，

您的代码有错误，请您做如下修改：
将：
cuComplex( float a, float b ) : r(a), i(b) {}

改成：
device cuComplex( float a, float b ) : r(a), i(b) {}

感谢您的周末来访。

4

编译成功了，太感谢啦:loveliness:

5

服务您是我们的荣幸，感谢您的来访，期待您的下次光临。