Nicholas Hopper hopper@cs.umn.edu writes:
On Thu, Jul 31, 2014 at 11:24 AM, George Kadianakis desnacked@riseup.net wrote:
- You can see that old guards (like RichardFeynman) see a shrinkage both on their guard and on their middle probabilities. This happens because both the total guard weight and the total middle weight get bigger [5], so their weight percentage gets smaller.
This doesn't sound right - total guard weight shouldn't change. All the proposal does is re-allocate some fraction of the weight of a guard back to the middle (M) category.
OK, I have some new data.
I plotted the (vanilla) probability distribution of all possible middle nodes (so not only guard nodes like the previous graphs) for the consensus with valid-after '2014-08-01 13:00:00'.
I also parsed 2.5 months worth of consensuses to do the guardiness trick on the guard nodes, and then plotted the probability distribution of all possible middle nodes + the guardiness trick.
You can find a boxplot here (to see how outliers are distributed): https://people.torproject.org/~asn/guards4/middle_boxplot.png
You can read the output of the script here: https://people.torproject.org/~asn/guards4/results_sort_guardiness.txt (It's sorted based on the guardiness probability distribution. You can find one sorted based on the vanilla probability distribution here: https://people.torproject.org/~asn/guards4/results_sort_vanilla.txt)
Some notes: - You can see that young guards like 'monoversum' and 'yolocaust' got a decent weight upgrade because of their age putting them first in middle probability.
- If you scroll to the bottom you see some nodes with probability 0.0.
These nodes are plainly Exit nodes and they get nulled because of the bandwidth weight Wme being 0. OTOH, Guard+Exit nodes don't get nulled since Wmd=867; which is quite low and explains why no Guard+Exit nodes are on the top of the middle probability distribution.
This is related to what Zack asked.
My plan forward is to start working on the output file format (which means that I will have to take decisions on whether the script will be run repeatedly, or use some sort of state file) and also get more confidence that my script does not have any stupid bugs. I will publish my script RSN.
Cheers!