intel ocl 性能优化至最优 与omp+sse相当
openmp+sse	opencl-intel
kernel	frame	kernel	frame
3.2	7.1	3.7	7.7
4.0	7.7	4.1	8.1
4.4	8.1	4.6	8.6
4.9	8.6	5.1	9.1
关键：线程local设为null，系统默认设置