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Project Partners

The ESLEA project aims to enhance eVLBI capabilities utilizing UKLight infrastructure, focusing on control plane software, protocol development, and high-energy physics. Key objectives include optimizing switched light paths for VLBI by 2007 and enabling user access by 2007. Throughput and performance tests have shown promising results. Future plans include expanding connectivity, exploring new protocols, and addressing hardware performance issues to achieve higher data speeds.

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Project Partners

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  1. Project Partners Project Collaborators The Council for the Central Laboratory of the Research Councils £1.1 M, 11.5 FTE Funded by EPSRC GR/T04465/01 www.eslea.uklight.ac.uk

  2. UKLight www.eslea.uklight.ac.uk

  3. (Started Feb 1st 2005) Capability Development • Control Plane Software • Protocol Development Exploitation • High Energy Physics: CDF, ATLAS • Radio Astronomy: VLBI • High Perf. Computing: RealityGrid • E-Health: Integrative Biology www.eslea.uklight.ac.uk

  4. Particle Physics www.eslea.uklight.ac.uk

  5. Radio Astronomy www.eslea.uklight.ac.uk

  6. High Performance Computing www.eslea.uklight.ac.uk

  7. E-Health www.eslea.uklight.ac.uk

  8. Summary

  9. ESLEA eVLBI Objectives • Demonstrate advantages of VLBI data transport on UKLight over that available via production networks by April 2006 • Formulate methodologies for optimum use of switched light paths for VLBI by Jan 2007 • Help bring eVLBI to the user, April 2007(in conjunction with EXPress)

  10. UKLight Switched light path

  11. UDP Performance: 3 Flows on GÉANT • Throughput:5 Hour run 1500 byte MTU • Jodrell: JIVE2.0 GHz dual Xeon – 2.4 GHz dual Xeon670-840 Mbit/s • Medicina (Bologna):JIVE 800 MHz PIII – Mk5 (623)1.2 GHz PIII330 Mbit/s limited by sending PC • Torun:JIVE 2.4 GHz dual Xeon – Mk5 (575)1.2 GHz PIII245-325 Mbit/s limited by security policing (>600Mbit/s  20 Mbit/s) ? • Throughput:50 min period • Period is ~17 min

  12. Dwingeloo DWDM link Jodrell BankUK MedicinaItaly TorunPoland e-VLBI at the GÉANT2 Launch Jun 2005

  13. 18 Hour Flows on UKLightJodrell – JIVE, 26 June 2005 • Throughput: • Jodrell: JIVE2.4 GHz dual Xeon – 2.4 GHz dual Xeon960-980 Mbit/s • Traffic through SURFnet • Packet Loss • Only 3 groups with 10-150 lost packets each • No packets lost the rest of the time • Packet re-ordering • None

  14. What’s next at JBO/Man: • Routine eVLBI tests (PB) continue • ESLEA: • Report on European connectivity and use of UKLight • Report on connectivity to US (Haystack) • Tests: • More using UDP-vlbi (JBO, Bologna, Torun, UKLight vs production JBO-JIVE) • SC 2005, UKLight connections to Haystack • Higher spec motherboards? • DCCP tests (2006) • Simon: • Disk data transfer in UDP-vlbi • Characterize internet weather? • Effect of packet loss on correlator performance • EXPress

  15. Conclusion and Future directions • ESLEA project well underway. VLBI part is meeting milestones, Matt Strong (PDRA) just appointed. • G2 launch showed continuous long term flows as in VLBI have different characteristics to those in short term tests (Iperf, UDPmon) : more investigation needed – collaborating with DANTE and SURFnet • Packet loss is a killer for TCP – new protocols needed (ESLEA –DCCP, VSI-E? • The End Host Problem – limits performance • The performance of Motherboards, NICs, RAID controllers and Disks matter: Mk V units??? • New ESLEA objective: 512 Mbps in 2006? • MkV-B 2 Gbps data recording in 2 yrs? • Next generation correlator 10 Gbps in 5-10 yrs??

  16. Thanks to • Richard Hughes-Jones HEP Manchester • Paul Burgess, Simon Casey JBO • Steve Parsley, Arpad Szomoru, Cormac Reynolds JIVE • Colin Greenwood, Nicola Pezzi, John Graham, Peter Clarke ESLEA • EVN observatories staff

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