Contact: Les Cottrell, SLAC
We have created a web site organized to provide
easy access to all aspects of this project. Several new hosts have been added
to those monitored by the Internet End-to-end Performance Monitoring –
Bandwidth Project (IEPM-BW). We have added pages on documenting
procedures for setting up new remote hosts. We added access from the IEPM-BW
data to the PingER reporting web site.
We have built tools to facilitate and automate the
infrastructure management. This includes downloading of code, gathering the
remote configurations parameters (OS, cpu
speed, code versions, file locations), verifying windows and streams are set
correctly. To assist in auditing links that are having problems we put together
a reporting tool to identify problems. We review this on a daily basis to
identify where we need to focus effort to keep things running. As a result of
this, we made several modifications to the measurement tools to improve
robustness and recognize more failure modes.
We have defined and added several new tools to the IEPM-BW
suite, including: a simple forecasting
tool; We have been working to install the Globus infrastructure at SLAC so we can add GridFTP
to the IEPM-BW tool suite. We have made some stand-alone measurements, but are
still trying to resolve the certificates issues. We now have certificates for
the DoE-SG and Globus and are
working on enabling them. We developed tools to measure the throughputs
passively using the Cisco NetFlow
tools. This enables us to make forecasts for sites to which we are not making
passive measurements, and also to compare
and validate the active versus the passive measurements.
We have installed the latest Web100
instrumented TCP stack on two Linux 2.4 measurement hosts at SLAC. We are
starting to use Web100 to understand the throughput performance.
We have made public the IEPM-BW data and provided documentation
on how to access it. The data has been requested by CAIDA, ANL, and the Network
Weather Service (NWS). BNL are working on providing a more standard way to
access the data.
We have provided assistance to 3 major BaBar
collaborator sites (RAL, IN2P3 & INFN/Rome) that were experiencing network
problems. We documented the cases so
multiple people could work on the problems and to share the information as an
instructional tool. To assist others, including PPDG folks, in tackling network
related problems we put together a web site of case
studies related to poor network performance.
We have made presentations on the new measurement infrastructure
and results at several meetings including: the DARPA PI meeting in Washington (presentation),
the SciDAC meeting in Washington (presentation);
the Internet 2 End-to-end Performance Initiative working group at Tempe Arizona
(presentation);
the Global grid Forum in Toronto (presentation
on QBSS); the Internet 2 HENP networking working group in Toronto (presentation
on network measurement); the IEPM-PPDG collaboration meeting in Toronto (presentation);
visiting DoE program manager at SLAC (presentation
on IEPM-BW, presentation
on INCITE work); the International Committee on Future Accelerators
Standing committee on Inter-regional Connectivity (ICFA/SCIC) at CERN (presentation);
at the International Pure and Applied Mathematics (IPAM) workshop on Internet
measurements at UCLA (presentation).
We have had several meetings with various collaborators
including 2 phone meetings with the PPDG monitoring group; 2 with the Internet
2 End to end Performance Initiative group; a face to face meeting at SLAC with
the LBL team; a phone meeting with Rice; face to face meetings with member of
the European DataGrid at CERN and Daresbury
Lab; face to face meeting with the Rice/INCITE collaborators and the Delaware/Pathload/Pathrate collaborators.
We submitted a paper to the IEEE on the high performance
network measurement results and a second on the effects of compression on
throughput to the Edinburgh Global grid Forum meeting in July.
Jiri Navratil
from the
We are in the process of porting the measurement tools to
Linux from Solaris. We are also understanding Web100, deciding what parameters are useful to add to the IEPM-BW measurements, and whether and
how Web100 can be used to assist application steering
We have two sites
(FNAL and