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====== Zhiwei Xiao (肖之慰) ======

{{:large_3pii_43615i019118.jpg?200*200|}}

Parallel Processing Institute, Fudan University

Postal Address: RM 320, Software Building, 825 Zhangheng RD

Shanghai, P.R. China 201203

Email: zwxiao **at** fudan **dot** edu **dot** cn

===== Who am I =====

I am a third-year master student under the supervision of [[binyu_zang|Prof. Binyu Zang]] and [[/haibo_chen|Dr. Haibo Chen]]. My research interests are mainly on distributed systems. I share some interesting stuff on my [[http://xoyo.name|blog]].

===== Education =====
  * M.Sci. in Software School, Fudan University, P.R.China (2009.9 ~ Now)
  * B.Eng. in Software School, Fudan University, P.R.China (2005.9 ~ 2009.6)
  * B.Eng. in Computer Science, University College Dublin. (Joint-degree) (2005.9 ~ 2009.6)

===== Research Area =====

  * MapReduce and Hadoop on multicore clusters
  * NoSQL storage and HBase

===== Research Projects =====

  * (07/2011 ~ 10/2011) 	   Visiting student, Rice University
    *  Project Description: Implementing ZPL programs on MapReduce and HBase cluster. ZPL is an array language for scientific computation on parallel machines.
    *  Current Status: Under implementation based on our initial design.

  * (07/2010 ~ Now)   Distributed NoSQL storage performance
    *  Project Description: Firstly we evaluate HBase with some real applications, and then study the HBase implementation to seek for optimization or better design.
    *  Current Status: HBase falsely sequetializes irrelative put operations and thus causes long lock acquiring time. We’re attempting to parallelize these operations.

  * (03/2008 ~ Now)   MapReduce performance on cluster with multi-core nodes
    *  Project Description: We studied the MapReduce performance on multi-core cluster. We tried to exploit the power of multi-core machines to maximize MapReduce efficiency.
    *  Results: The poor performance of Hadoop mainly comes from object creation, large memory footprint, naive data structure and lack of good multithreading support. We have implemented a prototype system Azwraith, which outperforms the original MapReduce implementation from 1.4X to 3.5X.
    *  Current Status: Identify the interrupt handling issues in Hadoop. Propose a federated schedule model for MapReduce.

  * (09/2009 ~ 11/2009)  Worked on understanding the characteristics of IO in Hadoop and surveyed applying SSD to Hadoop and HBase
    *  Results: Mixed workloads incur a random disk access pattern in Hadoop. Using SSD as a disk cache and intermediate storage would gain a good speedup.

  * (03/2009 ~ 04/2009)  Evaluated parallel shared-memory applications with MapReduce cluster
    *  Results: Frequent communications in this kind of applications cause significant overhead on cluster. We proposed some extensions to the MapReduce model in our APPT’09 paper.

===== Publications =====

  * **Zhiwei Xiao**, Haibo Chen, Binyu Zang and Bo Huang. A Hierarchical Approach to Maximizing MapReduce Efficiency. In the Proceedings of the 20th International Conference on Parallel Architectures and Compilation Techniques (PACT’11, poster). 2011. [{{:publications:mr-pact11.pdf|pdf}}]
  * Chao Zhang, Chenning Xie, **Zhiwei Xiao**, and Haibo Chen. Evaluating the Performance and Scalability of MapReduce Applications on X10. In the Proceedings of the 9th International Symposium on Advanced Parallel Processing Technologies. 2011.
  * Shengkai Zhu, **Zhiwei Xiao**, Haibo Chen, Rong Chen, Weihua Zhang and Binyu Zang. Evaluating SPLASH-2 Applications Using MapReduce. In the Proceedings of the 8th International Symposium on Advanced Parallel Processing Technologies(APPT'09). 2009. [{{:publications:mr-splash2.pdf|pdf}}]

===== TA Work =====
  *	Spring, 2011	Computer System Engineering[[http://ppi.fudan.edu.cn/cse/2011/Overview.html|]]
  *	Autumn, 2010	Artificial Intelligence
  *	Autumn, 2009	Compiler
  *	Autumn, 2008	Operating System

===== Awards =====
 
  *	First Grade Scholarship for graduate students (2010).
  *	Outstanding Contribution Award at PPI (2009).
  *	First Grade Scholarship for Excellent Freshman (2009).
  *	Second Grade Scholarship (2006, 2007, 2008).