Investigating Network Performance – A Case Study. Ralph Spencer, Richard Hughes-Jones, Matt Strong and Simon Casey The University of Manchester G2 Technical Workshop, Cambridge, Jan 2006. Very Long Baseline Interferometry. eVLBI – using the Internet for data transfer.
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Ralph Spencer, Richard Hughes-Jones, Matt Strong and Simon Casey
The University of Manchester
G2 Technical Workshop, Cambridge, Jan 2006
eVLBI – using the Internet for data transfer
600 mas = 6000 A.U. at 10 kpc
Chalmers University of Technology, Gothenburg
Aim is to obtain maximum BW compatible with VLBI observing systems in Europe and USA.
First sustained data flow tests in Europe:
24-26 September 2002
Amsterdam Science and Technology Centre (WTCW)
“ We hereby challenge the international research
community to demonstrate applications that benefit from
huge amounts of bandwidth! ”
Wait timeThe Works:
50 bytes observations
UDP Man-UvA Gig 19 May 02
Recv Wire rate Mbits/s
Transmit Time per frame usUDP Throughput on the Production WAN
Mk 5’s are 1.2 GHz P3’s with Streamstore cards
and 8-pack exchangeable disks, 1.3 Tbytes storage.
Capable of 1 Gbps continuous recording and playback.
Made by Conduant, Haystack design.
Westerbork observations Netherlands
1Gb/s light now
(NB using Jumbo packets 4470 or 9000 bytes)
Project Partners observations
The Council for the Central Laboratory
of the Research Councils
£1.1 M, 11.5 FTE
e-VLBI at the GÉANT2 Launch Jun 2005
1500 byte MTU
<JBO Mk2 Westerbork array> Dwingeloo
Kashima 34-m >
Not much wrong with the networks!
VLBI Correlation: GRID Computation task Dwingeloo
Questions ? Dwingeloo