Andy Wang 264 Love Building Department of Computer Science Florida State University Tallahassee, FL 32306-4530

[Biographical Sketch][CV][Research] [Publications][Teaching][Links]

Andy Wang received his Ph.D. and M.S. in computer science from UCLA in 2003 and 1998, and his B.S. from UC Berkeley in 1995. He joined the Department of Computer Science at Florida State University as an Assistant Professor in 2003. His research interests include file systems, optimistic peer replication, performance evaluation, ad hoc network routing, operating systems, and distributed systems.

Andy Wang's research theme revolves around the management of data flows. His research on energy-efficient storage (Conquest-2 ) involves redirecting requests to data replicated at unused portions of disks, thereby creating opportunities to power down disks and save energy. His invention of electric-field-based routing allows mobile computers to form disjointed communicated paths without explicit coordination and globa l knowledge. The Conquest disk-persist ent-RAM file system uses specialized data paths to memory and disk storage to a chieve drastic performance improvements. His invention of permutes states offers a compact representation of di stributed systems with an exponential number of states and thus can be applied to analy ze optimistic replication systems wit h an exponential number of ways to propagate data updates. His work in real-time storage domain involves throttling the data flow to meet timing constraints.

Real-time I/Os

Qian08

Jin Qian, Christopher Meyers, and An-I Andy Wang. A Linux Implementation Validation of Track-Aligned Extents and Track-Aligned RAIDs. Proceedings of the 2008 USENIX Annual Technical Conference, June 2008.

Stanovich08

Mark J. Stanovich, Theodore P. Baker, and An-I Andy Wang. Throttling On-Disk Schedulers to Meet Soft-Real-Time Requirements. Proceedings of the 14th IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS), April 2008. Superceeds Technical Report TR-071025, Department of Computer Science, Florida State University, October 2007.

Qian07

Jin Qian and An-I Andy Wang. A Behind-the-Scenes Story on Applying Cross-Layer Coordination to Disks and RAIDs. Technical Report TR-071015, Department of Computer Science, Florida State University, October 2007.

Baker07

Theodore P. Baker, An-I Andy Wang, Mark J. Stanovich. Fitting Linux Device Drivers into an Analyzable Scheduling Framework. Proceedings of the 3rd Workshop on Operating Systems Platforms for Embedded Real-Time Applications, July 2007.

Lewandowski07

Mark Lewandowski, Mark Stanovich, Theodore Baker, Kartik Gopalan, An-I Andy Wang. Modeling Device Driver Effects in Real-Time Schedulability Analysis: Study of a Network Driver. Proceedings of the 13th IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS), April 2007.

Energy-saving Storage

Weddle07b

Charles Weddle, Mathew Oldham, Jin Qian, An-I Andy Wang, Peter Reiher, Geoff Kuenning. PARAID: A Gear-Shifting Power-Aware RAID. ACM Transactions on Storage (TOS), 3(3), October 2007 (invited).

Weddle07a

Charles Weddle, Mathew Oldham, Jin Qian, An-I Andy Wang, Peter Reiher, Geoff Kuenning. PARAID: A Gear-Shifting Power-Aware RAID. Proceedings of the 5th USENIX Conference on File and Storage Technologies (FAST), February 2007. Superceeds Technical Report TR-060323, Department of Computer Science, Florida State University, 2006.

Mobile Ad hoc Networks

Mahajan07

Atulya Mahajan, Niranjan Potnis, Kartik Gopalan, and An-I Andy Wang. Modeling VANET Deployment in URBAN Settings. Proceedings of the 10th ACM/IEEE International Symposium on Modeling Analysis, and Simulation of Wireless and Mobile Systems (MSWiM), October 2007.

Niranjin07

Niranjan Potnis, Atulya Mahajan, An-I Andy Wang, and Kartik Gopalan. Evaluation of Mesh-Enhanced VANET Deployment Models. Proceedings of the 16th International Conference on Computer Communications and Networks (ICCCN), Workshop on Advanced Networking and Communications, August 2007.

Mahajan06

Atulya Mahajan, Niranjan Potnis, Kartik Gopalan, An-I Andy Wang. Evaluation of Mobility Models for Vehicular Ad-Hoc Network Simulations. Proceedings of the 2nd IEEE International Workshop on Next Generation Wireless Networks, December 2006. Superceeds Technical Report TR-051220, Department of Computer Science, Florida State University, 2005.

Nguyen04

Nam T. Nguyen, An-I Andy Wang, Geoffrey H. Kuenning, Peter Reiher. Electric-Field-Based Routing: A Reliable Framework for Routing in MANETs, ACM SIGMOBILE Mobile Computing and Communications Review (MC2R), 8(2), pp. 35-49, April 2004. <http://www.cs.fsu.edu/~awang/papers/mc2r2004a.html>

Wang03c

An-I Andy Wang, Geoffrey H. Kuenning, Peter Reiher. Book Chapter: Multipath Routing for Ad Hoc Networks. Mobile and Wireless Internet: Protocols, Algorithms, and Systems, Kluwer Academic Publishers, July 2003.

Workload Analysis

Fox08b

Cory Fox, Dragan Lojpur, An-I Andy Wang. Quantifying Temporal and Spatial Localities in Storage Workloads and Transformations by Data Path Components. Technical Report TR-080406, Department of Computer Science, Florida State University, April 2008.

Fox08a

Cory Fox, Dragan Lojpur, and An-I Andy Wang. Work-in-Progress-Report: Quantifying Temporal and Spatial Localities Due to File System Caching Online Proceedings of the 6th USENIX Conference on File and Storage Technologies, February 2008.

Wang03b

An-I Andy Wang, Geoffrey H. Kuenning, Peter Reiher, Gerald Popek. The Effects of Memory-Rich Environments on File System Microbenchmarks. Proceedings of the 2003 International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS), Montreal, July 2003. <http://www.cs.fsu.edu/~awang/papers/spects2003a.html>

Memory-based Storage

Wang06

An-I Andy Wang, Geoff Kuenning, Peter Reiher, and Gerald Popek. The Conquest File System: Better Performance Through a Disk/Persistent-RAM Hybrid Design. ACM Transactions on Storage (TOS), 2(3), pp. 309-348, August 2006.

Wang03a

An-I Andy Wang. The Conquest File System: A Disk/Persistent-RAM Hybrid Design for Better Performance and Simpler Data Paths. Ph.D. Dissertation. Computer Science Department, University of California, Los Angeles, March 2003. <http://www.cs.fsu.edu/~awang/papers/dissertation2003a.html>

Wang02b

An-I Andy Wang, Geoffrey H. Kuenning, Peter Reiher, Gerald J. Popek. Conquest: Better Performance Through a Disk/Persistent-RAM Hybrid File System. Proceedings of the 2002 USENIX Annual Technical Conference, Monterey, June 2002. <http://www.cs.fsu.edu/~awang/papers/usenix2002a.html>

Wang02a

An-I Andy Wang, Geoffrey H. Kuenning, Peter Reiher, Gerald J. Popek. Work-in-Progress Report: Conquest: Better Performance Through a Disk/Persistent-RAM Hybrid File System. On-Line Proceedings of the 1st USENIX Conference on File and Storage Technologies (FAST), Monterey, January 2002. <http://www.cs.fsu.edu/~awang/papers/fast2002a.html>

Wang01a

An-I Andy Wang, Geoffrey H. Kuenning, Peter Reiher, Gerald J. Popek. Position Summary: The Conquest File System--Life after Disks. Proceedings of the 8th IEEE Workshop on Hot Topics in Operating Systems (HotOS VIII), Schloss Elmau, Germany, May 2001. <http://www.cs.fsu.edu/~awang/papers/hotos2001.html>

Optimistic Replication

Wang07

An-I Andy Wang, Geoff Kuenning, and Peter Reiher. Using Permuted States and Validated Simulation to Analyze Conflict Rates in Optimistic Replication. SCS Simulation: Transactions of the Society for Modeling and Simulation International, 83(8), pp. 551-569, August 2007.

Wang05b

An-I Andy Wang, Geoff H. Kuenning, Peter Reiher. Using Permuted States and Validated Simulation to Analyze Conflict Rates in Optimistic Replication, 2005 International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS), July 2005.<http://www.cs.fsu.edu/~awang/papers/spects2005.html>

Wang05a

An-I Andy Wang, Geoff H. Kuenning, Peter Reiher. Introducing Permuted States for Analyzing Conflict Rates in Optimistic Replication, ACM International Conference on Measurement and Modeling of Computer Systems (SIGMETRICS), June 2005.

Wang03b

An-I Andy Wang, Geoffrey H. Kuenning, Peter Reiher, Gerald Popek. The Effects of Memory-Rich Environments on File System Microbenchmarks. Proceedings of the 2003 International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS), Montreal, July 2003. <http://www.cs.fsu.edu/~awang/papers/spects2003a.html>

Wang02c

An-I Andy Wang, Peter Reiher, Rajive Bagrodia, Geoffrey H. Kuenning. Understanding the Behavior of the Conflict-Rate Metric in Optimistic Peer Replication. Proceedings of the 5th IEEE International Workshop on Mobility in Databases and Distributed Systems (MDDS), Aix-en-Provence, France, September 2002. <http://www.cs.fsu.edu/~awang/papers/mdds2002a.html>

Wang01b

An-I Andy Wang, Peter Reiher, Rajive Bagrodia. A Simulation Framework and Evaluation for Optimistically Replicated Filing Environments. Technical report CSD-010046, Computer Science Department, University of California, Los Angeles, 2001. <http://www.cs.fsu.edu/~awang/papers/ucla2001a.html>

Wang99b

An-I Andy Wang, Peter Reiher, Rajive Bagrodia. Validation Experiences of the Simulation Framework for Optimistically Replicated Filing Environments: A Case Study. Proceedings of the DARPA/NIST Network Simulation Validation Workshop, Fairfax, Virginia, May 1999.

Wang99a

An-I Andy Wang, Peter Reiher, Rajive Bagrodia. A Simulation Evaluation of Optimistically Replicated Filing in Mobile Environments. Proceedings of the 18th IEEE International Performance, Computing, and Communication Conference (IPCCC), Phoenix/Scottsdale, Arizona, February 1999. <http://www.cs.fsu.edu/~awang/papers/ipccc1999a.html>

Kuenning98

Geoffrey H. Kuenning, Richard G. Guy, Gerald J. Popek, Peter Reiher, An-I Andy Wang. Measuring the Quality of Service of Optimistic Replication. Proceedings of the 12th European Conference on Object-Oriented Programming (ECOOP) Workshop on Mobility and Replication, Brussels, Belgium, July 1998. <http://www.cs.fsu.edu/~awang/papers/ecoop1998a.html>

Wang98

An-I Andy Wang. A Simulation Evaluation for Optimistically Replicated Filing Environments. Master's Thesis. Computer Science Department, University of California, Los Angeles, 1998.

Wang97

An-I Andy Wang, Peter Reiher, Rajive Bagrodia. A Simulation Framework for Evaluating Optimistically Replicated Filing Environments. Technical report CSD-970018. Computer Science Department, University of California, Los Angeles, 1997.

Distributed Coordination

Nguyen04

Nam T. Nguyen, An-I Andy Wang, Geoffrey H. Kuenning, Peter Reiher. Electric-Field-Based Routing: A Reliable Framework for Routing in MANETs, ACM SIGMOBILE Mobile Computing and Communications Review (MC2R), 8(2), pp. 35-49, April 2004. <http://www.cs.fsu.edu/~awang/papers/mc2r2004a.html>

Yarvis99

Mark D. Yarvis, An-I Andy Wang, Alexy Rudenko, Peter Reiher, Gerald J. Popek. Conductor: Distributed Adaptation for Complex Networks. Technical report CSD-990042. Computer Science Department, University of California, Los Angeles, 1999. <http://www.cs.fsu.edu/~awang/papers/ucla1999a.html>

FSU

COP 4610 / CGS 5765 (operating systems), spring 2008

COP 5611 (advanced operating systems), spring 2008

COP 4530 / CGS 5425 (data structures, algorithms, and generic programming), fall 2003

COP 4610 / CGS 5765 (operating systems), fall 2004, fall 2005, fall 2006, fall 2007

CIS 4930 / COP 5641 (kernel and device driver programming), summer 2007

COP 5611 (advanced operating systems), spring 2004, spring 2005, spring 2006, spring 2007

CIS 6935 (LENS seminar series), spring 2005

CIS 6935 (operating systems reading group), spring 2004

CIS 6935 (energy-aware storage systems), spring 2007

UCLA

CS111 (operating systems), spring 2003

CS111 Lab (an introduction to Linux kernel development), winter/spring 2000

My collection of fun links

Random art gallery

My previous life