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-#include "head.wmi" TITLE="Metrics Project: Measuring the Tor Network" CHARSET="UTF-8"

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-<div class="main-column">

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-

-<h2>Metrics Project: Measuring the Tor Network</h2>

-<hr />

-

-<p>

-The Metrics Project aims at measuring various aspects of the Tor network,

-including both contributed resources and network usage. These information

-are important, e.g., for deciding what parts of the network require more

-support to better meet user needs.

-</p>

-

-<p>

-There are at least three aspects of the Tor network which shall be

-considered in this project:

-</p>

-

-<ul>

-<li><b>Relays:</b> There are already statistics covering the data that

-relays report about themselves and which are confirmed in parts by the

-directory authorities. The <a

-href="http://torstatus.kgprog.com/">TorStatus</a> project evaluates the

-hourly published directories containing lists of all running relays and

-keeps track of their uptimes and advertised bandwidths. However, an

-aggregate view of the development of relays over an extended period of time

-is still missing. In addition to that, all information about provided

-bandwidth capacity as reported by the relays is not necessarily

-trustworthy. There has not been a comprehensive measurement of relay

-performance so far to validate bandwidth claims and relay stability.</li>

-<li><b>Bridges:</b> A special type of relays is running as bridges. Bridges

-are relaying traffic, too, but are not listed in the public directory. The

-purpose of bridges is to allow censored clients to connect to the Tor

-network without their censor being able to prohibit access easily. The

-number and capacity of bridges is therefore not publicly known and has not

-been evaluated, yet.</li>

-<li><b>Clients:</b> Little is known about usage of the Tor network. In

-particular, the number and location of clients are largely unknown. A rough

-estimation is that there are a few hundreds of thousands of clients in the

-network; a number which is very hard to verify. There are no recent studies

-on the number of Tor users which would help obtaining a better picture on

-usage of the Tor network. Clearly, all investigations of clients need to be

-performed with special care and in highly aggregated form to protect users'

-anonymity.</li>

-</ul>

-

-<p>

-The Metrics Project is planned to run for three years from September 2008

-to August 2011 (see section 5.7 of the <a

-href="https://svn.torproject.org/svn/tor/trunk/doc/roadmaps/2008-12-19-roadmap-full.pdf">three-year

-development roadmap</a> for more details). Milestones are scheduled for

-every six months in this period. The following sections (yet only one) show

-progress made in these milestones.

-</p>

-

-<h3>February 2009</h3>

-

-<p>

-The first milestone of the Metrics Project is intended to evaluate public

-data about the Tor network, like network statuses and router descriptors.

-These evaluations

-shall help decide what data will be needed in the future to measure

-contribution to and usage of the Tor network. The following results are

-already available. <a href="<page contact>">Feedback</a> is very welcome!

-</p>

-

-<ul>

-<li>Evaluation of Relays from Public Directory Data (<a

-href="https://git.torproject.org/checkout/metrics/master/report/dirarch/dirarch-2009-06-22.pdf">PDF</a>,

-558K, last updated on June 22, 2009).</li>

-<li>Analysis of Bridge Usage in Tor (<a

-href="https://git.torproject.org/checkout/metrics/master/report/bridges/bridges-2009-06-22.pdf">PDF</a>,

-76K, last updated on June 22, 2009).</li>

-<li>Evaluation of Client Requests to the Directories to determine total numbers

-and countries of users (<a

-href="https://git.torproject.org/checkout/metrics/master/report/dirreq/directory-requests-2009-06-25.pdf">PDF</a>,

-207K, last updated on June 25, 2009).</li>

-

-<li>All scripts and sources used in these evaluations (not the data,

-unfortunately) are available in a public Git repository that can be cloned

-using the following command:<br /> <tt>git clone

-git://git.torproject.org/git/metrics/</tt></li>

-</ul>

-

-<h3>August 2009</h3>

-

-<p>

-The second milestone focuses on both network and performance metrics.

-</p>

-

-<ul>

-<li>Possible problems of directory authorities assigning Stable and Guard flags (<a

-href="https://git.torproject.org/checkout/metrics/master/report/dirarch/relayflags-2009-04-01.pdf">PDF</a>,

-2M from April 1, 2009).</li>

-<li>Simulation of the number of Fast, Stable, and Guard flags for changed

-requirements (<a

-href="https://git.torproject.org/checkout/metrics/master/report/dirarch/flagrequirements-2009-04-11.pdf">PDF</a>,

-229K from April 11, 2009).</li>

-<li>Reducing the Circuit Window Size in Tor (<a

-href="https://git.torproject.org/checkout/metrics/master/report/circwindow/circwindow-2009-08-19.pdf">PDF</a>,

-110K from August 19, 2009).</li>

-<li>Performance of Requests over the Tor Network (<a

-href="https://git.torproject.org/checkout/metrics/master/report/performance/torperf-2009-08-24.pdf">PDF</a>,

-2.8M from August 24, 2009).</li>

-<li>Analysis of Circuit Queues in Tor (<a

-href="https://git.torproject.org/checkout/metrics/master/report/buffer/bufferstats-2009-08-25.pdf">PDF</a>,

-196K from August 25, 2009).</li>

-</ul>

-

-<br />

-

-</div><!-- #main -->

-

-#include <foot.wmi>

-