| ACADEMIC STATUS |
I'm currently pursuing a Ph.D. in the Computer Science Department at Rice University. I enrolled in the doctoral program in Fall 1998, and work with Dr. Peter Druschel. I expect to graduate in spring 2003.
| RESEARCH AND PRIOR EDUCATION |
Research area: Operating systems (physical memory management, disk scheduling), peer-to-peer systems.
[this entire section needs restructuring!]
Also add info on the Superpages stuff, the new memory
management work, and Squirrel.
If you're a casual visitor, consider looking at the rest of my
"research" section..
| MS Thesis, and corresponding publication in the Symposium on Operating Systems Principles (SOSP 2001): | ||
| Anticipatory scheduling: A disk scheduling framework to overcome deceptive idleness in synchronous I/O | ||
| Authors: | Sitaram Iyer, Peter Druschel | |
| Abstract: | Disk schedulers in current operating systems are generally
work-conserving, i.e., they schedule a request as soon as the previous
request has finished. Such schedulers often require multiple
outstanding requests from each process to meet system-level goals of
performance and quality of service. Unfortunately, many common
applications issue disk read requests in a synchronous manner,
interspersing successive requests with short periods of computation.
The scheduler chooses the next request too early; this induces deceptive
idleness, a condition where the scheduler incorrectly assumes that
the last request issuing process has no further requests, and becomes
forced to switch to a request from another process.
We propose the anticipatory disk scheduling framework to solve this problem in a simple, general and transparent way, based on the non-work-conserving scheduling discipline. Our FreeBSD implementation is observed to yield large benefits on a range of microbenchmarks and real workloads. The Apache webserver delivers between 29% and 71% more throughput on a disk-intensive workload. The Andrew filesystem benchmark runs faster by 8%, due to a speedup of 54% in its read-intensive phase. Variants of the TPC-B database benchmark exhibit improvements between 2% and 60%. Proportional-share schedulers are seen to achieve their contracts accurately and efficiently. |
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| Paper: | A resource management framework for predictable QoS for webservers (submitted for publication) | |
| Authors: | Mohit Aron, Sitaram Iyer, Peter Druschel | |
| Abstract: | We present a framework wherein webserver operators can ensure a minimal quality of service guarantee for multiple websites hosted on one server. A measurement-based admission control mechanism decides the feasibility of hosting the sites, whereupon a feedback-based resource scheduling framework maintains the desired QoS levels. I worked on the disk and memory aspects of this problem. |
| BTech Thesis, and corresponding publication in the Intl. conference on Knowledge Bases in Computer Systems (KBCS) '98: | ||
| Xority: a measure of separability of training sets for hidden layer size estimation in neural networks. | ||
| Authors: | Sitaram Iyer, Pushpak Bhattacharyya | |
| Abstract: | We devise a new approach to estimate the practical size of a neural network. Our proposed metric captures inherent regularities in training sets, thus drastically lowering the expected neural network size. | |
A subsection on research software: Anticipatory scheduler for FreeBSD, part of FreePastry..
| EMPLOYMENT |
Summer intern at the Bhabha Atomic Research Center, Bombay (1997):
I worked on, and finished a project on parallelized implementation of neural networks for handwritten character recognition.
Summer internship at Microsoft Research Lab, Cambridge, UK, working on peer-to-peer web caching. Describe.
| TEACHING EXPERIENCE |
I have been a teaching assistant for a total of six semesters: five at Rice University, and one at IIT Bombay. These courses were diverse, but four of them were in the Systems area. My duties have included teaching, conducting laboratory sessions, assisting students with projects, and grading examinations.
| PROFESSIONAL ACTIVITIES |
I have referreed submissions to conferences such as SOSP, OSDI, USENIX, Sigmetrics, Infocom and ISCA.
| SKILLS |
| REFERENCES |
| CONTACT INFORMATION |
| Email: | Sitaram Iyer <ssiyer@cs.rice.edu > | ||
| Webpage: | http://www.cs.rice.edu/~ssiyer/ | ||
| Address: |
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| Phone: | 713-348-3726 (off) 832-865-3139 (cell) 713-661-4302 (res) |