0-4-2-understand-jitter

name	0.4.2-understand-jitter
description	[0.4.2] Randomized variance introduced into the computed delay to decorrelate competing threads and mitigate thunderin

understand-jitter

CALL NUMBER: deep_spinlock.jitter DEFINITION: Randomized variance introduced into the computed delay to decorrelate competing threads and mitigate thundering-herd synchronization on lock release.

Invoke this skill to understand jitter down to its primitives. The RELATIVE ROOT below is the least-fixed-point closure of everything it bundles from — the full import cone, grouped by the lib each prim comes from. Projected from a prover-typed KB (MAP/SWI-Prolog consistency gate): every reference below resolves.

THE RELATIVE ROOT (the import cone, by lib)

from deep_spinlock

• decorrelated_jitter (d1): Jitter strategy where each thread computes delay = random.uniform(min_delay, previous_delay * 3); history-dependent decorrelation reduces coordinated retry waves.
• equal_jitter (d1): Jitter strategy computing delay = base_delay / 2 + random.uniform(0, base_delay / 2); ensures wait never falls below half the nominal delay.
• full_jitter (d1): Jitter strategy selecting a uniform random value in the range [0, current_delay]; maximizes desynchronization at the cost of potentially very short waits.

CONSUMERS (what needs this)

exponential_backoff

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Projected from the concurrency synchronization primitives and memory models KB (155 concepts / 137 relations) — consistency-typed by MAP; the facet list after the colon IS the cross-lib dependency web.

(leaf — this is an actual skill.)