I'm a Ph.D. student in the Computer Science Department at the University of Southern California. I work as a research assistant at the Center for Grid Technologies, USC Information Sciences Institute. My advisor is Ann Chervenak.
Research
Over the past few years, Grid computing has emerged as one of the
leading distributed computing technologies that facilitate the
utilization of computational resources across multiple sites. Several
scientific communities, including those from high-energy physics,
bioinformatics, climate modeling and earthquake sciences, use Grid
resources to execute data analysis and
visualization processes. As the scale of data processed and the number
of resources used by scientific applications have increased, several
issues dealing with the efficient execution of these applications
have been identified. To deal with the issues of describing the various tasks
comprising each application and their interactions and of describing
the data items consumed and generated during the execution of an
application, scientists have adopted computational
workflows.
As computational workflows only describe tasks, data items and
their relationships, the execution of these workflows involves the
identification of suitable resources where the tasks can be executed
and the creation of auxiliary tasks that facilitate the movement of
data items from storage resources to computational resources and
vice-versa. This is performed by a planner. Once the execution details
have been fixed, the workflow is submitted for execution on the
Grid. The actual execution is managed by multiple components including
the workflow manager that ensures that precedence constraints between
individual tasks are respected, the metascheduler that manages
submission of jobs to Grid resources and monitors their progress and
schedulers that allocate processing elements on Grid resources.
My research deals with the facilitation of two key aspects of executing
scientific applications on the Grid. As part of my thesis, I have
developed and evaluated a scalable peer-to-peer
grid information system that facilitates access to resource
information during the planning phase. More recently, I have focused
on efficient movement of input data items to and output data products
from computational resources during the execution of scientific
workflows.
Shishir Bharathi and Ann Chervenak. Data Staging Strategies and their Impact on the Execution of Scientific Workflows. Accepted to the 2nd Workshop on Data Aware Distributed Computing (DADC 2009), in conjunction with HPDC 2009, Munich, Germany, 2009.
[2]
Ann Chervenak, Robert Schuler, Matei Ripeanu, Muhammad Ali Amer, Shishir
Bharathi, Ian Foster, Adriana Iamnitchi, and Carl Kesselman.
The Globus Replica Location Service: Design and experience.
To appear in IEEE Transactions on Parallel and Distributed Systems.
[3]
Shishir Bharathi, Ann Chervenak, Ewa Deelman, Gaurang Mehta, Mei-Hui Su,
and Karan Vahi.
Characterization of scientific workflows.
In The 3rd Workshop on Workflows in Support of Large Scale
Science (WORKS08), in conjunction with Supercomputing 2008, Austin, TX,
2008.
[4]
Ann Chervenak and Shishir Bharathi.
Peer-to-peer approaches to grid resource discovery.
In Making Grids Work, Danelutto, Marco; Fragopoulou, Paraskevi;
Getov, Vladimir (Eds.), pages 59-76, 2008.
[5]
Shishir Bharathi, David Kempe, and Mahyar Salek.
Competitive influence maximization in social networks.
In Xiaotie Deng and Fan Chung Graham, editors, Internet and
Network Economics, Third International Workshop, WINE 2007, San Diego, CA,
USA, December 12-14, Proceedings, volume 4858 of Lecture Notes in
Computer Science, pages 306-311. Springer, 2007.
[6]
Ann L. Chervenak, Ewa Deelman, Miron Livny, Mei-Hui Su, Robert Schuler,
Shishir Bharathi, Gaurang Mehta, and Karan Vahi.
Data placement for scientific applications in distributed
environments.
In 8th IEEE/ACM Intl. Conf. on Grid Computing, pages 267-274.
IEEE, 2007.
[7]
R. Ananthakrishnan, D. E. Bernholdt, S. Bharathi, D. Brown, M. Chen,
A. Chervenak, L. Cinquini, R. Drach, I. T. Foster, P. Fox, D. Fraser,
K. Halliday, S. Hankin, P. Jones, C. Kesselman, D. E. Middleton,
J. Schwidder, R. Schweitzer, R. Schuler, A. Shoshani, F. Siebenlist, A. Sim,
W. G. Strand, N. Wilhelmi, M. Su, and D. N. Williams.
Building a global federation system for climate change research: the
earth system grid center for enabling technologies (ESG-CET).
Journal of Physics: Conference Series, 78, 2007.
Also appeared in Proceedings of SciDAC 2007 Conference, 24-28 June
2007, Boston, MA.
[8]
David E. Bernholdt, Shishir Bharathi, David Brown, Kasidit
Chanchio, Meili Chen, Ann L. Chervenak, Luca Cinquini, Bob Drach, Ian T.
Foster, Peter Fox, Jose Garcia, Carl Kesselman, Rob S. Markel, Don Middleton,
Veronika Nefedova, Line Pouchard, Arie Shoshani, Alex Sim, Gary Strand, and
Dean Williams.
The Earth System Grid: Supporting the next generation of
climate modeling research.
CoRR, abs/0712.2262, 2007.
[9]
Shishir Bharathi and Ann L. Chervenak.
Design of a scalable peer-to-peer information system using the GT4
index service.
In 7th IEEE Intl. Symp. on Cluster Computing and the Grid, 14-17
May 2007, Rio de Janeiro, Brazil., pages 636-648. IEEE Computer Society,
2007.
[10]
Shishir Bharathi and Ann L. Chervenak.
Design of a peer-to-peer information system using the GT4 index
service.
In 7th IEEE/ACM International Conference on Grid Computing,
pages 321-322. IEEE, 2006.
[11]
Ann L. Chervenak, Jennifer M. Schopf, Laura Pearlman, Mei-Hui Su, Shishir
Bharathi, Luca Cinquini, Mike D'Arcy, Neill Miller, and David E. Bernholdt.
Monitoring the Earth System Grid with MDS4.
In e-Science, page 69. IEEE Computer Society, 2006.
[12]
Shishir Bharathi, Beom Kun Kim, Ann L. Chervenak, and Robert Schuler.
Combining virtual organization and local policies for automated
configuration of grid services.
In Hans Czap, Rainer Unland, Cherif Branki, and Huaglory Tianfield,
editors, Self-Organization and Autonomic Informatics (I), Proceedings of
the SOAS 2005 Conference, Glasgow, UK, volume 135 of Frontiers in
Artificial Intelligence and Applications, pages 194-202. IOS Press, 2005.
[13]
Ann L. Chervenak, Naveen Palavalli, Shishir Bharathi, Carl Kesselman, and
Robert Schwartzkopf.
Performance and scalability of a replica location service.
In 13th Intl. Symp. on High-Performance Distributed Computing,
4-6 June 2004, Honolulu, Hawaii, USA, pages 182-191. IEEE Computer Society,
2004.
[14]
Gurmeet Singh, Shishir Bharathi, Ann L. Chervenak, Ewa Deelman, Carl
Kesselman, Mary Manohar, Sonal Patil, and Laura Pearlman.
A metadata catalog service for data intensive applications.
In Proceedings of the ACM/IEEE SC2003 Conference on High
Performance Networking and Computing, 15-21 November 2003, Phoenix, AZ, USA,
page 33. ACM, 2003.
Contact
Shishir Bharathi
USC Information Sciences Institute
4676 Admiralty Way, Suite 1001
Marina del Rey, CA 90291
Phone: 310-448-8280
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