Richard HJ's Web Site

Activities & Projects

I work on the Trigger/DAQ for the ATLAS Experiment that will run at the LHC collider located at CERN. The work includes:

  • Remote Farms
  • Protocols in Trigger/DAQ
  • Gigabit Ethernet Performance
  • SCI Scalable Coherent Interface

Networking issues for transporting Radio Astronomy Very Long Baseline Interferometer data include:

  • High Throughput
  • New Protocols (TCP stacks & DDCP)
  • RAID Disk Sub-System Performance
  • SC2004 BandWidth Challenge and Demonstrations
  • Network Performance: Latency, Throughput, Jitter, Packet Loss, 1-way delay
  • End Host Behaviour: PCI/PCI-X Bus Activity, Memory bus, CPU load, Interrupts
  • Motherboards, NICs, TOEs, Switches & Routers

RAID and Disk sub-system tests

  • ESLEA RAID Disk Sub-System Performance (SC2004)
  • PCI/PCI-X traces
  • MB-NG & BarBar Disk Sub-System Performance

MB-NG is a 2.5 Gbit MPLS development network in the UK provided by UKERNA. As well as investigating QoS and MPLS the work includes:

  • High Throughput
  • TCP Stack Performance
  • Disk Sub-System Performance
  • Application Performance
  • SC2003 BandWidth Challenge and Demonstrations
  • High Performance High Throughput
  • TCP Stack Performance
  • 10 Gigabit Ethernet
  • SC2003 BandWidth Challenge and Demonstrations
  • Performance, Throughput and QoS tests on GEANT
  • Demo to EU 2003
  • Monitoring



SCI [Scalable Coherent Interface (ANSI-IEEE Std 1596-1992)]. From 1992 to 1998 the Manchester HEP group designed and built several interfaces to test the SCI memory-memory interconnect for use in the Level2 Trigger of the ATLAS experiment. SCI was extensively tested at CERN in the ATLAS Demo_B project during 1997 and 1998.



Enjoy, but the usual disclaimers apply!

Feedback is welcome!

©2003, 2004, 2005 Richard Hughes-Jones (
3 Apr 2005.

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