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Ich有一個奇怪的問題。我剛開始使用openCL開發並實現了一個簡單的矩陣乘法:OpenCL任務掛在提交的
void MatrixMult(float *M, float *N, float *P, int width) {
cl_context context = core.getContext();
cl_command_queue commandQueue = core.getCommandQueue();
// create the kernel
cl_kernel kernel = core.createKernel("MatrixMultKernel");
// reserve memory for i/o
int size = width * width * sizeof(float);
cl_mem Md = clCreateBuffer(context, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR, size, M, NULL);
cl_mem Nd = clCreateBuffer(context, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR, size, N, NULL);
cl_mem Pd = clCreateBuffer(context, CL_MEM_WRITE_ONLY , size, NULL, NULL);
// define kernel args
clSetKernelArg(kernel, 0, sizeof(cl_mem), &Md);
clSetKernelArg(kernel, 1, sizeof(cl_mem), &Nd);
clSetKernelArg(kernel, 2, sizeof(cl_mem), &Pd);
clSetKernelArg(kernel, 3, sizeof(int), &width);
// create kernel instances
size_t globalSize[] = {static_cast<size_t>(width), static_cast<size_t>(width)};
cl_int kernelError = clEnqueueNDRangeKernel(commandQueue, kernel, 2, NULL, globalSize, NULL, 0, NULL, NULL);
if (kernelError != CL_SUCCESS) {
NSLog(@"Error executing kernel");
}
// read back results
clEnqueueReadBuffer(commandQueue, Pd, false, 0, size, P, 0, NULL, &readEvent);
clSetEventCallback(readEvent, CL_COMPLETE, &eventCallback, NULL);
}
我的問題是回調從不被調用。我測試小型輸入應立即完成。
奇怪的是,每當我第二次調用函數(MatrixMult)時,回調就會觸發,因爲它應該如此。每次連續呼叫都是一樣的。當我檢查事件時,它不會觸發它總是有狀態CL_SUBMITTED。這裏發生了什麼?