N_block		Time
-------		----
64		21790.438	21778.760
96		21859.258	21874.418
128		21804.926	21805.340		
160		21782.631	21767.371
192		21775.680	21775.271
224		21757.059	21757.037
256		21693.633	21693.344
512		21833.027	21833.027
