2. DID interning gave an almost 6x reduction in backfill write amp!!!!! write amp!!!!!! 36x -> 6.2x write amplification! hugeeee for running hubble on smaller VPSes with lower-throughput network block storage. i gotta write this one uppppp
fig (aka:[phil])
bonus backfill notes: 1. the order of repos from relay listRepos has a *significant* bias toward bigger-repos-first. this is not optimal for minimizing total backfill time!! 2. theres a huge backfill write amplification trick: interning DIDs. write amp!! not space! i gotta write this one up.
Jul 31, 2026 at 7:33 PM
Hubble first launch: 1500x cheaper getRepo for Bridgy Fed - microcosm
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full-network space efficiency update: bad news: event though 84% of all repos are stale (no activity in 30 days), stale repos only make up 20% of the data in the network. moving them to cheap storage doesn't buy much. good news: the data in network is small?? like sub-1TB, minimal magic needed
"The end result of all of this is that we grew from 2k users to almost 150k, added a ton of heavy new functionality, and still managed to optimize and cut down costs from $.15 per active user per month to just $.03 or so." - @snarfed.org breaks down all the work he's done to optimize Bridgy Fed 1/
Bridging on a budget
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