カーネル関数をループで600回以上実行すると(手動でリセットする必要があります)、コンピューターがクラッシュします(50回程度であればクラッシュしません)。クラッシュの原因がわかりません。
私のメインは次のとおりです。
int main()
{
int *seam = new int [image->height];
int width = image->width;
int height = image->height;
int *fMC = (int*)malloc(width*height*sizeof(int*));
int *fNew = (int*)malloc(width*height*sizeof(int*));
for(int i=0;i<numOfSeams;i++)
{
seam = cpufindSeamV2(fMC,width,height,1);
fMC = kernel_shiftSeam(fMC,fNew,seam,width,height,nWidth,1);
for(int k=0;k<height;k++)
{
fMC[(nWidth-1)+width*k] = INT_MAX;
}
}
そして私のカーネルは:
int* kernel_shiftSeam(int *MCEnergyMat, int *newE, int *seam, int width, int height, int x, int direction)
{
//time measurement
float elapsed_time_ms = 0;
cudaEvent_t start, stop; //threads per block
dim3 threads(16,16);
//blocks
dim3 blocks((width+threads.x-1)/threads.x, (height+threads.y-1)/threads.y);
//MCEnergy and Seam arrays on device
int *device_MC, *device_new, *device_Seam;
//MCEnergy and Seam arrays on host
int *host_MC, *host_new, *host_Seam;
//total number of bytes in array
int size = width*height*sizeof(int);
int seamSize;
if(direction == 1)
{
seamSize = height*sizeof(int);
host_Seam = (int*)malloc(seamSize);
for(int i=0;i<height;i++)
host_Seam[i] = seam[i];
}
else
{
seamSize = width*sizeof(int);
host_Seam = (int*)malloc(seamSize);
for(int i=0;i<width;i++)
host_Seam[i] = seam[i];
}
cudaMallocHost((void**)&host_MC, size );
cudaMallocHost((void**)&host_new, size );
host_MC = MCEnergyMat;
host_new = newE;
//allocate 1D flat array on device
cudaMalloc((void**)&device_MC, size);
cudaMalloc((void**)&device_new, size);
cudaMalloc((void**)&device_Seam, seamSize);
//copy host array to device
cudaMemcpy(device_MC, host_MC, size, cudaMemcpyHostToDevice);
cudaMemcpy(device_new, host_new, size, cudaMemcpyHostToDevice);
cudaMemcpy(device_Seam, host_Seam, seamSize, cudaMemcpyHostToDevice);
//measure start time for cpu calculations
cudaEventCreate(&start);
cudaEventCreate(&stop);
cudaEventRecord(start, 0);
//perform gpu calculations
if(direction == 1)
{
gpu_shiftSeam<<< blocks,threads >>>(device_MC, device_new, device_Seam, width, height, x);
}
//measure end time for cpu calcuations
cudaEventRecord(stop, 0);
cudaEventSynchronize(stop);
cudaEventElapsedTime(&elapsed_time_ms, start, stop );
execTime += elapsed_time_ms;
//copy out the results back to host
cudaMemcpy(newE, device_new, size, cudaMemcpyDeviceToHost);
//free memory
free(host_Seam);
cudaFree(host_MC); cudaFree(host_new);
cudaFree(device_MC); cudaFree(device_new); cudaFree(device_Seam);
//destroy event objects
cudaEventDestroy(start); cudaEventDestroy(stop);
return newE;
}
そのため、「kernel_shiftSeam」を何度も呼び出すとプログラムがクラッシュします。また、cudaFreeを使用してメモリを解放したため、メモリリークの問題かどうかわかりません。誰かが私を正しい方向に向けることができれば素晴らしいと思います。