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当使用clSetKernelArg(memory_object)设置内核参数并使用clEnqueueNDKernelRangeKernel()多次调用内核时,您以前在内核的clSetKernelArg()中将参数设置为的memory_object是从主机传输到GPU,每次调用内核?opencl中的多个内核调用
status = clSetKernelArg(kernel, 0, sizeof(cl_mem), &inbuf);
size_t num_total_wi = M * N;
size_t num_wg = num_elem/N + ((num_elem/N == 0) ? 0 : 1);
size_t num_iter = num_elem/(num_total_wi) + (((num_elem % (num_total_wi)) == 0) ? 0 : 1);
for(i = 0; i < num_iter; i++) {
size_t global_work_size[3] = {num_total_wi, 1, 1};
size_t local_ws[3] = {N, 1, 1};
size_t global_offset[3] = {i * num_total_wi, 0, 0};
clEnqueueNDRangeKernel(queue, kernel, 1, global_offset, global_work_size, local_ws, 0, NULL, NULL);
}