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Re: [tor-talk] computing the Tor Metric's "advertised bandwidth" and "read bandwidth" from the archived Tor consensus
On 15/08/14 00:22, Virgil Griffith wrote:
> I've been parsing the historical collecTor consensus files using the Stem
> library. I want to be able to recreate the existing numbers before I delve
> into new stuff, so I am attempting to recreate some datapoints from the
> Metrics site.
> The "router status entries", queried by:
> has a "bandwidth" and "measured" entry. But, it remains unclear to me how
> to derive the "bandwidth history" on:
> * https://metrics.torproject.org/bandwidth.html
> I presume the "bandwidth claimed" in the RouterStatus descriptor is
> synonymous with the "advertised bandwidth" on Metrics. However, the
> "measured" entry in the RouterStatus descriptor has been blank for every
> file I tried. Therefore it's unclear to me how to compute the "bandwidth
> history" line on Metrics.
> Any enlightenment here?
The various bandwidth numbers in Tor descriptors are all but
self-explanatory. Presuming things will almost always lead you in the
wrong direction. That's also the case here.
I suggest you start by reading the relevant parts in dir-spec.txt
(search for bandwidth):
Short answer: the bandwidth history graphs are based on the bandwidth
histories contained in extra-info descriptors. Search for
"read-history" and "write-history" in dir.spec.txt.
All the best,
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