UMBRA

24 notes filed under UMBRA, newest first. Same rules as the rest of the pile: a codename, a theme, and no internals.

codename UMBRA · 24 notes · 24 themes · all codenames

all themes addressing-semantics 1 admission-control 1 api-shape 1 compatibility-planning 1 constant-time-sampling 1 data-layout 1 documentation-authority 1 execution-model 1 honest-limit 1 isolation 1 licensing 1 measurement 1 measurement-discipline 1 module-boundaries 1 proof-honesty 1 protocol-evolution 1 research-refutation 1 research-trials 1 semantic-porting 1 silent-failure 1 specification-audit 1 transport-identity 1 verification-coverage 1 verification-honesty 1

UMBRA · data-layout · 2 min read

three layouts that failed before the flat one worked

The generator for a memory-hard puzzle produces many millions of items and then visits their neighbours in a pattern with almost no locality. The natural data structure is a matrix of buckets. The natural implementation of that, in a…

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Each codename is a project. The theme is the class of problem the note is about — the same theme recurs across projects, which is usually the interesting part.

ABACUS 60 FLINT 12 KEEL 24 LARDER 24 LATTICE 36 MERIDIAN 24 MISE 24 SCRIBE 12 TROUPE 12 UMBRA 24 browse 244 themes

UMBRA

UMBRA notes

three layouts that failed before the flat one worked

Other codenames