From 5baf0a10a7c86628cae56f1b279a90bd85735308 Mon Sep 17 00:00:00 2001 From: npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@buzz.block.builderlab.xyz> Date: Thu, 30 Jul 2026 14:51:59 -0400 Subject: [PATCH] docs: fix stacked-levers figure (~3.4d -> ~5.1d) and reconcile r8g to 1.4d MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Dawn's Correction 2: stacked levers multiply M, days add — 1.882 x 1.330 x 1.111 = 2.782 -> 5.09d at Td=3.45d (4.93d interaction-aware). The ~3.4d figure required Td=2.55d, a fast-edge result reported as central. Also reconciles the kickoff-era r8g '~1.5 days' at line 90 to the fitted 1.4d used everywhere else. Conclusion unchanged: no infra lever outruns the curve. Co-authored-by: npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@buzz.block.builderlab.xyz> Signed-off-by: npub1qyvc0c5kl4gqv2fd97fsk46tu378sqgy35vc83rvgfwne90sel7s0ed67d <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@buzz.block.builderlab.xyz> --- docs/redis-cluster-mode.md | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/docs/redis-cluster-mode.md b/docs/redis-cluster-mode.md index c94af08fe..b230d0918 100644 --- a/docs/redis-cluster-mode.md +++ b/docs/redis-cluster-mode.md @@ -87,8 +87,8 @@ profile `bb-public-operations-ro`). window spanning the onset). - Whole-instance CPU ~4%, memory 0.09%, replication lag <1ms. Vertical scaling is dead: same-family bigger instances have identical single-core - speed; r8g (Graviton4) buys ~25–30% single-thread ≈ 1.5 days at the current - doubling rate. + speed; r8g (Graviton4) buys ~25–30% single-thread ≈ 1.4 days at the fitted + 3.45-day doubling (1.33x → Td·log₂(1.33)). - **Fit window (measured, P3):** the curve has a sharp onset at 2026-07-21 ~18:00Z — flat ~0.55% for the preceding five days, then exponential within one 15-min bin (subscribed channels 74→1303 in four hours at a pinned @@ -776,7 +776,7 @@ REDIS_CLUSTER_PRODUCTION_PRIOR_ART.md`, `…_OPEN_SOURCE_PRIOR_ART.md`, post-P2** (N=8 post-P2: +4.3d). Any one-time capacity gain of factor M buys exactly `Td·log₂(M)` days, so no N reachable this week buys two doublings, and every available lever — sharding, r8g (+1.4d), presence - reduction, all stacked (~3.4d) — is smaller than the migration's own + reduction, all stacked (~5.1d; 4.9d interaction-aware) — is smaller than the migration's own duration estimate (14d aggressive / 21d likely / 35d conservative; soft, LOC-derived, not a bottom-up plan). **Shard count is therefore not a runway purchase, and the honest case for cluster mode is optionality,