[atlas] More even earth distribution of measurement probes
- Previous message (by thread): [atlas] More even earth distribution of measurement probes
- Next message (by thread): [atlas] More even earth distribution of measurement probes
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Vesna Manojlovic
BECHA at ripe.net
Fri Mar 10 12:56:40 CET 2017
Dear Marat, On 10/03/17 09:47, Marat Khalili wrote: > I'd like to check worldwide connectivity to my site. I create a new > measurement via web-interface and add, say, 300 probes, expecting them > to cover most world countries. There was a hackathon project that made this possible in some way, called "Spatial Bucketing of RIPE Atlas Probes on Map Projection", by Julian Hammer: "[he] wanted to solve the following problem: when scheduling measurements from lots of probes, requesting a "random worldwide selection" currently results in a choice that is very biased towards Western/Northern Europe and the USA (see image without Sbucket on the left). Julian's solution makes a more equal selection, by using the grid to divide the globe and choose probes based on that division (see image on the right after applying Sbucket)." Images: https://labs.ripe.net/Members/becha/ripe-atlas-hackathon-results Code: https://github.com/cod3monk/RIPE-Atlas-sbucket I hope you find this useful! Cheers, Vesna > However, looking at the map > <https://atlas.ripe.net/measurements/7861872/?filter=#map> I notice that > most are selected from Europe: there're two dozens in Netherlands (many > with same ASNs), but only two in Australia, one in Japan and nothing in > Brazil. Obviously, most ATLAS probes are from Europe, and selection > algorithm does not take probe density into account. > > Wouldn't it be nice to have the following features in web-interface and API: > * even distribution of probes by country or continent based on > population, area, and other user-defined weight numbers; > * avoiding probes with same ASNs > ? > > I don't know how current algorithm works, but easiest modification would > be two-step process: (1) randomly select country based on specified > weights; (2) randomly select probe within country, avoiding earlier > selected probes or ASNs and failing if none are left available; repeat > from step 1 until necessary number of probes is selected. > > P.S. I tried to manually request 1 probe from each country, but stumbled > on unrecognised country codes, countries with no probes etc. before even > trying population-weighted distribution. Without direct access to probes > database nice solution can be difficult to achieve via current API, > although crude one looks possible. > > P.P.S. I understand this option will create more load on probes in > less-covered countries, but since it's possible to limit selection to > specific countries anyway this is hardly a strong argument against > adding this feature. > > -- > > With Best Regards, > Marat Khalili
- Previous message (by thread): [atlas] More even earth distribution of measurement probes
- Next message (by thread): [atlas] More even earth distribution of measurement probes
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]