Report on IEPM
PPDG Efforts for the Quarter January - March 2006
As part of the Terapaths project we collaborated with ESnet to make measurements
of jitter with
OSCARS. The results
showed that OSCARS worked well both to limit throughput
and to reduce jitter.
Many improvments were made to the IEPM-BW output to add more scatter plots, to
provide a zoom capability, extend the use of pathload and work with the author to add timeouts,
to improve the detection of events using the Holt-Winters method.
At the requests of the SLAC accelerator operations folks we made a
of an Oracle application's performance between SLAC and ORNL. The problem
was resolved to be in the application.
We put together a
paper on the effectiveness of passive monitoring for
forecasting for CHEP06. The results are promising but do not remove the need
for active monitoring.
PingER and Developing Region Monitoring
Based on a paper by Bamba Gueye
and others on locating Internet hosts, we are developing a web based Java host
location tool called
This uses ping Round Trip Times (RTTs) from landmark sites to the host
whose location is desired to provide triangulation information to determine its
location. A problem with Gueye's method was its lack of landmarks outside Europe
and N. America, so we developed a reverse ping server that is being deployed at
IEPM PingER and BW sites to provide landmark facilities. Besides N. America
and Europe we now have landmarks in Brazil, S. Africa, India, Pakistan, Taiwan,
and Japan and are actively working to add others. In particular we are working with
the NLANR/AMP measurement team to install
the landmark code at critical AMP sites in New Zealand, Australia, China,
Malaysia, Phillippines, Chile and N. Africa. Besides providing a general purpose
tool to help locate hosts for Internet users, it will also be valuable to
validate the locations of over 700 PingER sites around the world. Since we
supposedly know the locations ofthe PingER sites. It will
enable us to evaluate the accuracy of the method.
We made progress on automating PingER management by providing scripts to
identify and tabulate non-responding hosts.
We finished up the yearly
ICFA/SCIC review on network performance worldwide. We then used this as a
basis for a
detailed study of performance for S. Asia and Africa that was
presented at CHEP06. To simplify producing the performance report figures
we are developing a Java application to provide long term performance
We completed a Memorandum of Understanding with Microsoft to evaluate and report on
the performance of the new TCP stack that will be released with the next version
of Microsoft Windows (Vista/Longhorn). Following this we installed Windows Vista and
Longhorn and completed the first
phase of the evaluation using production high-speed networks within the US and
Admin, visits, papers, presentations, proposals etc.
The IEPM group hosted a successful two week vist by two staff members from the Pakistan National
University of Sciences and Technology (NUST) Institute of Information
Technology (NIIT). The visit was to discuss further collaboration and projects.
As a result we put together projects to:
Les Cottrell visited NUST/NIIT in Rawalpindi/Pakistan for a week to work with
students and faculty and to present findings on Pakistani Academic and Research
network performance to various senior ministers and leaders in Pakistan.
We also got agreement from NTC and COMSATS to install PingER monitoring hosts
at their PoPs in Pakistan.
- Integrate Smokeping and PingER
- Evaluate pathneck
- Improve PingER visualization
- Integrate PingER and AMP
- Provide automated diagnosis of events
We submitted the following proposals:
- SciDAC: SOCRATES: Series of Circuits Rapidly Allocated for Efficient Sharing
together with GA Tech, U.and Ga, U. Va, Colorado State
- SciDAC: CANTIS: Center for Application-Network Total-Integration for SciDAC
with ORNL, BNL, FNAL, GA Tech, PNNL, UCD.
- SciDAC: Large Hadron Collider - Monitoring Infrastructure with Caltech and
- NSF MPS/Physics: PLaNetS: Physics Lambda Network System with Caltech, U. Fl,
Haystack/MIT, UCAID, FNAL, BNL, U. Mich.
We made the following presentations:
Evaluation of Techniques to Detect Significant Network Performance
Problems using End-to-end Active Network Measurements
R. L. Cottrell, M. Chhaparia, F. Haro, F. Nazir, M. Sandford,
NOMS 2006, April 2006
Quantifying the Digital Divide: A Scientific Overview of the
Connectivity of South Asian and African Countries
A. Rehmatullah, R. L. Cottrell, J. Williams, A. Ali,
Terapaths: A QOS-Enabled Collaborative Data Sharing Infrastructure for
Peta-Scale Computing Research,
S. Bradley, F. Burstein, B. Gibbard, D. Katramatos, R. Popescu, D. Stampf,
D. Yu, R. L. Cottrell, Y. Li, S. McKee, CHEP06.
A Better Internet ComputerWorld News Story, February 13, 2006.
January 2006 Report of the ICFA-SCIC Monitoring Working Group
edited by Les Cottrell for the ICFA SCIC Monitoring Working Group.
IEPM-BW Deployment Experiences Presented by Connie Logg to the Joint Techs
Workshop February 2006, Albuquerque, New Mexico.
IEPM-BW: Bandwidth Change Detection and Traceroute Analysis and Visualization
Presented by Connie Logg to the Joint Techs Workshop February 2006, Albuquerque, New Mexico.
Stanford University, SLAC, NIIT, the Digital Divide and Bandwidth Challenge
Presented by Les Cottrell to the NUST/NIIT Faculty,Islamabad, Feb 2006.
Using Netflow for Forecasting Presented by Les
Cottrell at CHEP06.
Quantifying the Digital Divide: A scientific overview of the connectivity of South
Asian and African Countries presented by Les Cottrell at CHEP06.
SC|05 Presentation to ESnet (pdf) presented by Yee-Ting Li at the ESCC Meeting, University of New Mexico 02/09/06.