Thank you Dr. Karsten for your answer. Following your instruction, I am now understanding meaning of three terms: "advertised bandwidth", "bandwidth history", and "consensus weight" on Metrics. So please let me link those term with terms in Stem, and please correct me if I am wrong cos I am using Stem Library so I really need to know which term in Metrics is associated with which term in Stem: Syntax: <term in Metrics = term in Stem>
1. advertised bandwidth = observed_bandwidth > (observed_bandwidth function is in: > https://stem.torproject.org/api/descriptor/server_descriptor.html) to check it: I look at atlas of the IP: 94.198.68.13, and found advertised > bandwidth = 70.72 KB/s, and also using desc.observed_bandwidth in stem to > fetch the same IP, and got 70720 (B/s) by using these code lines: from stem.descriptor.remote import DescriptorDownloader > downloader = DescriptorDownloader() > try: for desc in downloader.get_server_descriptors().run(): print '%s %i' %(IP, desc.observed_bandwidth) 2. bandwidth history = Not Available (?) > I cannot find what function should be used in Stem to retrieve the > bandwidth history value. 3. consensus weight = bandwidth or = measured This one maybe the weirdest one, but please correct me if I misunderstand > the terms. As I look at the consensus file @ > http://86.59.21.38/tor/status-vote/current/consensus > and look at the specification for "w" line @ > https://gitweb.torproject.org/torspec.git/tree/dir-spec.txt#n1768 > I found they wrote that "w line is An estimate of the bandwidth of this > relay, in an arbitrary unit (currently kilobytes per second)", in stead > of unit-less as you answered and written in Stem @ > https://stem.torproject.org/api/descriptor/router_status_entry.html Next what I tried to figure out the question myself by writing these code lines: from stem.descriptor.remote import DescriptorDownloader > downloader = DescriptorDownloader() try: for desc in downloader.get_consensus().run(): print '%s %i' %(IP, desc.measured) and get 95.215.44.189 None > 73.15.150.172 None > 162.247.72.201 None ...and so on While if I use this code lines: from stem.descriptor.remote import DescriptorDownloader > downloader = DescriptorDownloader() try: for desc in downloader.get_consensus().run(): print '%s %i' %(IP, desc.bandwidth) I would get this result: 95.215.44.189 323 > 73.15.150.172 14 > 162.247.72.201 6240 which is exactly the same with values in consensus file @ http://86.59.21.38/tor/status-vote/current/consensus Therefore, I am confused about consensus weight (in metrics VS in directory specification) VS bandwidth and measured (in Stem). Which of them is unit-less, and which of them is in B/s or KB/s. And, which value one should use to calculate probability of a relay in path selection in proportion to its bandwidth. I am so sorry if the way I raise and organize the question make you confused or hard to understand. Especially to Dr. Karsten, I am so sorry to ask you about Stem in related to Metrics cos I am aware that Stem in not under your management. Yours Sincerely! -- tor-talk mailing list - tor-talk@lists.torproject.org To unsubscribe or change other settings go to https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-talk
