E-mail: caodg@pku.edu.cnDonggang Cao received the PhD degree in computer science from Peking University, China in 2004. He is currently an associate professor in the School of Electronics Engineering and Computer Science at Peking University. His research interests include parallel and distributed processing, system software, network technologies, etc.;Lianghuan Kang received the PhD degree in computer science from the School of Electronics Engineering and Computer Science at Peking University, China in 2015. His research interests include parallel and distributed processing, programming languages, etc.;Hanglong Zhan is a PhD candidate in computer science in the School of Electronics Engineering and Computer Science at Peking University, China. His research interests include big data processing, graph processing, etc.;Hong Mei received the PhD degree in computer science from Shanghai Jiaotong University, China in 1992. He is currently a professor in the School of Electronics Engineering and Computer Science at Peking University, China. His research interests include software engineering, system software, etc.