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Yesterday, 23rd June 2004, a network test was performed between JIVE and
three "telescopes".
Onsala and Torun participated using Mark5s and their direct network
connections, whilst, in lieu of Medicina, GARR installed a suitable
machine at their POP in Bologna. The test used IPERF so we measured
memory to memory performance using test data and no disk access. Results
are summarised below:
Source > destination: min - max; average (in Mb/s)
Onsala > JIVE: 40.4 - 134; 64.7
Torun > JIVE: 67.5 - 344; 156.3
Bologna > JIVE: 237 - 601 ; 499.3
JIVE > Onsala: 238 - 390; 332.7
JIVE > Torun: 174 - 207; 191.7
JIVE > Bologna: 109 - 111; 110.0
The above results are for TCP tests. UDP tests failed for reasons that
we are yet to investigate. We also have to understand why the rates were
so variable and why they fell so far short of the 1Gb/s that we expect.
Anyway, the high bandwidth connection to Torun *was* established,
albeit at the last minute, thanks to hard work in Torun and behind the
scenes activity at Dante and in Poznan. This is a very positive result.
We can now begin to plan some three and four station eVLIB tests.
Thanks to everyone who took part.
Regards, Steve.
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S M Parsley _______
Manager, Technical Operations and R&D ___|___
Joint Institute for VLBI in Europe / | \
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+31-(0)521-596519 (direct) __|_|__
+31-(0)521-596500 (switch) _|_|_
+31-(0)621 201418 (mobile) \\ /
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http://www.jive.nl / | \
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