A serve process with no client connected, no active workflow runs, and --no-schedule set still holds a large, steady fraction of one core. The load is on the main event-loop thread, which points at a hot timer/poll rather than request work. Besides wasting a core, it starves request handling and produces multi-second tail latencies on otherwise sub-second reads.

Environment

swamp 20260718.081020.0-sha.fc14abbd
serve with token auth, --no-schedule, single repo (~581 data records; datastore has accumulated a sizeable WAL). Run history: 30 succeeded / 4 failed / a few suspended.

Measurements

Sampling /proc/<pid>/task/*/stat (utime + stime deltas) over several-second windows with no client connected:

Whole process: ~40–70% of one core, sustained, across repeated windows.
Per-thread over a 3s window:
- main event-loop thread: ~38%
- four V8 worker threads: ~1.7% each
- tokio worker threads: ~0.3% each

Under an added read load the same process rose to ~112% and individual data.query calls slowed (~570ms to ~1000ms), i.e. the idle work contends with request handling.

Impact

One core consumed continuously at rest.
Tail latencies: an otherwise ~500ms read occasionally spikes to ~3.4s, consistent with the event loop being busy when the request arrives.

Suggested direction

Profile the main event-loop thread at rest (no clients) to find the hot timer/poll.
Confirm whether any internal loop ignores --no-schedule, or polls the datastore / WAL on a tight interval.

Repro

Start serve with --no-schedule and no clients.
Sample the process's CPU (e.g. /proc/<pid>/stat, or per-thread via /proc/<pid>/task/*/stat) over several seconds.
Observe sustained main-thread CPU with zero external traffic.

The scan-cost issue #1284 (https://swamp-club.com/lab/1284) sets the ~500ms baseline for reads; this issue explains the multi-second tail on top of it.

02Bog Flow

Open

7/20/2026, 5:13:13 AM

No activity in this phase yet.

03Sludge Pulse

Bundled extension model cannot deserialize AWS SDK S3 XML that works in direct Deno

gcp/sheets spreadsheets-values: batch_get crashes with "Request with GET/HEAD method cannot have body"

Token creation API and UI scope selector for collective tokens (phase 4 of #960)

Make Cloudflare CRUD methods factory-aware so list-discovered resources can be managed in-place

Add @swamp/kubernetes/statefulset model type

serve: workflow.approvals and workflow.run.search still full-scan the workflow-run store after the #1284 data.query pushdown

Sync guard skips bound namespace directory during push — 0 files pushed after namespace migrate

Flaky #1052 preparePush test: mtime-granularity race on Linux tmpfs

command/shell renders JSON-object stdout lines as the literal string 'undefined'

Issue redactor treats the MongoDB authSource parameter as a secret, corrupting reproduction steps

namespace unset --migrate silently deletes artifact history via catalog-rebuild GC (~484k files lost)

Docs: document repo root resolution from subdirectories

Expose the swamp.club feed as an RSS feed

Email invitation is not linked to account created from invite URL

Add serve, datastore, vault, and worker wildcard scopes to token registry (phase 4 prep, #960)

datastore setup extension drops 'namespace' from --config, making extensions that require it impossible to configure

Docs: update manual to document --yes/-y as the standard confirmation-skip flag

Docs: update data.query and CEL expressions references for SQL pushdown

Docs: document collective token CLI usage in API key authentication pages

Add a --release-notes option to `swamp update` (or even make it the default)

Docs: manual should state workflow unknown keys are rejected and placement is step-only (follow-up to #1240)

Make GCP CRUD methods factory-aware so list-discovered resources can be managed in-place

serve: read ops (data.query, workflow.approvals, workflow run.search) linearly scan the whole datastore — ~350–600ms floor regardless of match count

Running "swamp workflow run ..." in a subdir of the swamp repo fails

Guide agents to inspect reports after failed model and workflow runs

serve: main JS thread holds ~40–70% of a core while idle (no clients, no runs, --no-schedule)

Search box collapses to near-zero width on mobile on the Extensions page

Extensions page: Search bar missing on mobile

spreadsheets-values: every method fails with 'Missing required path parameter: spreadsheetId' — implementation reads a global argument the schema does not declare

namespace migrate/set workflow broken for extension datastores: migrate skipped by sync guard, set not idempotent, migrate-index empties shards

ExtensionInfo.latestVersion typed 'string' but registry returns null; harden pull/resolve for prerelease-only extensions

workflow.run: relay a custom model method's output as method_output (command steps already do)

promptChoice infinite-loops on non-interactive stdin

gcp _lib: unconditional x-goog-user-project header causes USER_PROJECT_DENIED (403) for service accounts without the serviceUsageConsumer role

extension push: issue-verdict review is indistinguishable from missing/stale

swamp extension version crashes with 'Invalid CalVer version: "null"' when only a prerelease (beta/rc) version is published

Pushing an extension after creating a public git repo that is the same as other previously pushed extensions doesn't update the "Verified public repository"

`datastore setup filesystem` never transfers content when leaving a sync-based (remote) datastore — copies only the catalog and hardcodes `filesPulled: 0`

Scaleway models: create methods should not require the resource ID they generate (ipId/gatewayId/serverId/...)

gcp/calendar events.list reads wrong array field ('defaultReminders' not 'items') → always returns 0 events

provisioner.provision fails with 'Cannot read properties of undefined (reading trim)' at method_execution_service.ts:852

method_execution_service.ts:852 crashes on undefined.trim() when writeResource receives undefined instance name

CLI support for collective API tokens (phase 3 of #960)

@swamp/gcp/calendar: service-account & ADC auth mint cloud-platform-scoped tokens → 403 on Calendar API

Scope enforcement and whoami introspection for collective tokens (phase 2 of #960)

fix(software-factory): DeclaredSchemaSchema.enum rejects boolean literals

Surface cloud-provider labels (scaleway, digitalocean, oracle/oci) as first-class search/filter facets on the Extensions page

Profile link in genesis subdirectory does not navigate back to main profile

Profile stats: per-user daily rollup table + MV in ClickHouse

Reconcile collective-token CLI activity to members (attribute → bonus → stamp → even-split)

Telemetry stats consumer: unsanitized subcommand in Mongo update path drops user metrics silently

Telemetry stats consumer: insert_id dedup commits before the write it guards — any upsert failure is silently swallowed on retry

Job-level labels: block is silently ignored, not rejected

Issue submission redactor silently corrupts report bodies

CLI telemetry: fold third-level verbs into subcommand + canonicalize aliases

Docs: update extension info reference to document extensions (type grafts) in content metadata

Docs: swamp skill repo-structure reference still documents repo-local .swamp/telemetry/ as live

Add safe adoption and lifecycle methods for existing Hetzner resources

Docs: update manual telemetry reference for user-global spool and telemetry.yaml opt-out

export const extension can graft methods onto foreign-collective types, undisclosed in extension info / contentMetadata

Add lookup support to the Cloudflare DNS records model

Expand token scope registry to full taxonomy (phase 1 addendum, #960)

Docs: document user-global telemetry (telemetry.yaml opt-out, spool location, telemetry stats behavior)

score_daily rollup strands stale grains when a day-less grant re-stamps onto a later day

swamp-club: global rate limiter runs pre-auth and collapses all direct clients into one per-IP bucket — 429s authenticated CLI traffic

Collective API token scopes: domain, persistence, and auth threading (phase 1 of #960)

Telemetry migration from ~/.swamp/telemetry should auto-detect home-as-repo

feed_post_score_events queue grows unboundedly (no TTL, no delete-on-delivery)

Issue-filing skill should require ownership classification before submitting a bug

Interactive finder silently drops the preview pane on narrower terminals, and layout selection is unstable

@-mention autocomplete for users when writing lab ripples

Remove comments from /feed and redesign the page

Interactive finder preview corrupts: overlapping/stale lines when preview content overflows the pane

Score-refresh consumer: harden coalescing against a diverse backlog (bistability)

Remove feed comments — consolidate discussion in Discord

Add a 'my collective extensions' filter to extensions page

Relax the profanity filter

Extension search returns edit-distance noise for short queries ("asdl" → "AWS DEADLINE")

Telemetry recoverOrphaned startup race with multiple replicas (created_at-based)

Telemetry retry/failed path has the same non-atomic claim as #820

Grant revoke is never applied to the running server — under `--grant-reload auto` and `manual` alike, a revoked grant stays in force until an explicit `access reload`