> On 8 Dec 2015, at 10:43, Tom Ritter <t...@ritter.vg> wrote: > > On 7 December 2015 at 13:51, Philipp Winter <p...@nymity.ch > <mailto:p...@nymity.ch>> wrote: >> I spent some time improving the existing relay uptime visualisation [0]. >> Inspired by a research paper [1], the new algorithm uses single-linkage >> clustering with Pearson's correlation coefficient as distance function. >> The idea is that relays are grouped next to each other if their uptime >> (basically a binary sequence) is highly correlated. Check out the >> following gallery. It contains monthly relay uptime images, dating back >> to 2007: >> <https://nymity.ch/sybilhunting/uptime-visualisation/ >> <https://nymity.ch/sybilhunting/uptime-visualisation/>> >> >> If you aren't familiar with this type of visualisation: Every image >> shows the uptime of all Tor relays that were online in a given month. >> Every row is a consensus and every column is a relay. White pixels mean >> that a relay was offline and black pixels means that a relay was >> online. Red pixels are used to highlight suspiciously similar clusters. > > That's really cool. It seems to imply that the majority of the tor > network stop operating halfway through the month though... Do the > other tor graphs take into account hibernating relays? For example, I > would expect the time-to-download graph would be somewhat affected: > https://metrics.torproject.org/torperf.html?graph=torperf&start=2015-10-01&end=2015-10-31&source=all&filesize=5mb > > <https://metrics.torproject.org/torperf.html?graph=torperf&start=2015-10-01&end=2015-10-31&source=all&filesize=5mb> Hibernating relays run from the start of their first period to gauge load. Then they start at a random time during the day/month, but early enough that they think they'll still use all their bandwidth.
I wonder if we're seeing another phenomenon? (daily / monthly server restarts?) Or we could be seeing hibernation failing to work as intended. Tim Tim Wilson-Brown (teor) teor2345 at gmail dot com PGP 968F094B teor at blah dot im OTR CAD08081 9755866D 89E2A06F E3558B7F B5A9D14F
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