Two graduate students working with ESnet have published their papers recently in IEEE and ACM workshops.
Bibek Shrestha, a graduate student at the University of Nevada, Reno, and his advisor Engin Arslan worked with Richard Cziva from ESnet to publish a work on “INT Based Network-Aware Task Scheduling for Edge Computing”. In the paper, Bibek investigated the use of in-band network telemetry (INT) for real-time in-network task scheduling. Bibek’s experimental analysis using various workload types and network congestion scenarios revealed that enhancing task scheduling of edge computing with high-precision network telemetry can lead up to a 40% reduction in data transfer times and up to 30% reduction in total task execution times by favoring edge servers in uncongested (or mildly congested) sections of the network when scheduling tasks. The paper will appear in the 3rd Workshop on Parallel AI and Systems for the Edge (PAISE) co-conducted with IEEE IPDPS 2021 conference to be held on May 21st, 2021, in Portland, Oregon.
Zhang Liu, a former ESnet intern and a current graduate student at the University of Colorado at Boulder, worked with the ESnet High Touch Team – Chin Guok, Bruce Mah, Yatish Kumar, and Richard Cziva – on fastcapa-ng, ESnet’s telemetry processing software. In the paper “Programmable Per-Packet Network Telemetry: From Wire to Kafka at Scale,” Zhang showed the scaling and performance characteristics of fastcapa-ng, and highlighted the most critical performance considerations that allow the pushing of 10.4 million telemetry packets per second to Kafka with only 5 CPU cores, which is more than enough to handle 170 Gbit/s of original traffic with 1512B MTU. This paper will appear in the 4th International Workshop on Systems and Network Telemetry and Analytics (SNTA 2021) held at the ACM HPCD 2021 conference in Stockholm, Sweden between 21-25 June 2021.
Congratulations Bibek and Zhang!
If you are a networked systems research student looking to collaborate with us on network measurements, please reach out to Richard Cziva. If you are interested in a summer internship with ESnet, please visit this page.
The dramatic collapse of the Arecibo Observatory Radio Telescope in Puerto Rico in December was a terrible loss for global science. The 305-meter dish had served for over 50 years, supporting a wide range of cosmic and earth science applications, including transmission of the famed “Arecibo Message” to globular star cluster M13 by a team led by Frank Drake and Carl Sagan in 1974.
When the 900-ton instrument platform crashed onto the observatory dish, the National Science Foundation was faced with a variety of challenges. Most immediately, how to ensure that several petabytes of historic (and now irreplaceable) data at the Arecibo Observatory (AO) data center, in the form of tapes, hard drives, and other physical media, could be preserved and moved off-site as an approximately $50M site cleanup and environmental remediation project begins to demobilize the iconic observatory.
This data recovery effort has required rapid mobilization of a team from the University of Central Florida (UCF), the Texas Advanced Computing Center (TACC), the University of Puerto Rico (UPR), the University of Chicago, and others. A more detailed description of this overall effort has just been released here. In this blog, I will describe the key role that ESnet and the Engagement and Performance Operations Center (EPOC) played in this effort to save valuable scientific data.
My colleagues Hans Addleman (Indiana University International Networks), George Robb, and I became part of science use case discussions with AO and UCF as part of an ESnet requirements review and EPOC Deep Dive support to Arecibo in early 2020. In the summer of 2020, these efforts became much more active after the first suspension cable failed and AO began activities to migrate data storage and processing to a commercial cloud. We provided support to the Arecibo team for data movement hardware and software deployment.
With the failure of a second cable in November 2020, it became apparent that the facility had become unstable; this increased pressure on the team to find a faster solution. The UCF site management team decided that migration to the commercial cloud over the available 1Gbps connection (a previous 10Gbps connection was damaged by Hurricane Maria in 2017) would not meet requirements, so another data migration strategy was needed.
By December the team developed an alternative data migration approach leveraging a timely offer of storage capacity at TACC. Because of the urgency, the team decided to move data using physical Network Attached Storage (NAS) appliances; data on tapes and other original sources were loaded onto the NAS at Arecibo. The NAS were then driven to data centers on the island: either at the UPR campuses located at Mayagüez or Río Piedras, or at a commercial data center on the island, each of which were connected to the global R&E network at 10Gbps. Using Globus data transfer software, the AO team then began the process of transferring the data to TACC. Using multiple devices, and by setting up a constantly moving supply line, they were able to fill a disk, transport to the better connected locations, start a transfer, take back a completed disk, and return to the AO data center to start the process all over.
EPOC team members (specifically George) spent a lot of time working with AO and Globus technical support to tune the NAS appliances (which are usually used in commercial/enterprise settings) to be able to transfer the data at higher rates of performance than the factory settings allowed. EPOC, AO, UCF, TACC, and UPR staff also ran perfSONAR tests to ensure the entire path was able to deliver on these faster speeds that were necessary. George will be presenting a talk at Globus World in May, and those interested in more information about how this networking and disk NAS tuning was done should plan to attend.
The data transfer operation started in late December 2020 and is expected to continue through the spring of 2021, as stored data (on disks and tapes at AO) is transferred to TACC. As data flows into TACC’s storage cluster from Arecibo’s holdings, ESnet and the entire collaboration team will ensure that it is made widely available to the scientific community to perform new studies with this valuable research data.
The destruction of the AO Radio Telescope was a catastrophe for global science; however, the quick response of the entire data recovery team helped prevent the loss of much of the valuable data collected by Arecibo over its lifetime. I’m very proud of this accomplishment: the work of the entire ESnet team and our data infrastructure ensured that we had the right capabilities at the right time to make a difference for science.
Three questions with a new staff member! Today, Joseph (Joe) Nasal, who has joined our Business Office as a Project Manager.
After graduating from Temple University, Joe began his career designing broadband Radio Frequency-hybrid fiber networks and management software for some of the first residential cable modem deployments in the country. Early on, he also worked in defense and designed and operated private secure communications networks for federal contractors. He spent the past two decades supporting higher education through roles in engineering, technical architecture, project management, and leadership. His work helped transform data communication at Pennsylvania State University, preparing the campus for tremendous growth in teaching and research.
What brought you to ESnet?
I’ve been architecting and managing very large communication network design and implementation projects for most of my career. After nearly 20 years at Penn State, it was time for a career change. One of my close colleagues recently came to ESnet in support of Science Engagement, and when I learned through him of an opportunity to help with such exciting and important growth on a national scale I was very happy to find a place in the organization. I’ll be operating out of my home office in State College, PA.
What is the most exciting thing going on in your field right now?
In data communications, it’s about getting more for less—more throughput, more distance, more fidelity, for less cost. Cost is measured in units like dollars, or time, or energy, or human effort, and those of us who work in this space are always trying to optimize these resources. This is an exciting time because it seems like we’re on the cusp of training machines to give us a magnitude leap forward in efficiencies via automated processes and learning algorithms. But it’s going to take clear human vision to get us to where we want to be, which means as engineers, we will continue to have fun solving big problems.
What book would you recommend?
The Man Who Loved Only Numbers, a biography of Paul Erdős. Paul was one of the great mathematicians of the 20th century whose work has implications for both computer science and information theory. He was an eccentric genius and his personal story is a fascinating one to follow. As engineers, I think it’s important to be aware of and appreciate the great thinkers who exist at the very base level of abstraction with respect to the technologies we use and build upon.
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