Raise `worker_threads` default to 1, make dispatch thread ingress-only by eddyashton · Pull Request #8404 · microsoft/CCF

Eddy Ashton (eddyashton) · 2026-09-18T15:29:49Z

Motivation

The enclave dispatch thread (Enclave::run_main) previously drained up to 256 tasks from ccf::tasks::get_main_job_board() on every iteration, in addition to the inbound ringbuffer (node-to-node inbound, ticks). This was a compatibility bodge from the old task system: it let opaque, potentially blocking tasks (JWT key auto-refresh and quote endorsement HTTP requests, historical query LFS access, retired-node cleanup requests, ...) execute on the consensus ingress thread, and with worker_threads=0 (the previous default/minimum) that thread was the only task executor.

Implementation summary

Enclave::run_main() (src/enclave/enclave.h) is now ingress-only: it waits on the work beacon, drains ringbuffer messages, and handles stop/stop-notice. It no longer executes tasks. run_worker() threads are now the sole task executors. The job board no longer needs to wake the dispatch thread, so JobBoard::set_work_beacon is no longer wired up from the Enclave constructor/destructor.
Since the host libuv loop is not a suitable task executor either (blocking tasks there would stall node-to-node and RPC socket polling), there must always be at least one run_worker thread. worker_threads now defaults to 1 (include/ccf/node/startup_config.h, doc/host_config_schema/host_config.json, CMakeLists.txt's WORKER_THREADS cache variable, tests/infra/e2e_args.py, and the sample configuration files).
To avoid a breaking change in a patch release, worker_threads: 0 is not rejected: src/host/run.cpp's new validate_and_coerce_worker_threads coerces it up to 1 and logs a [fail]-level message noting the substitution, before the node starts or --check returns.
Updated doc/architecture/threading.rst, doc/operations/resource_usage.rst, and CHANGELOG.md to describe the new default and the 0 -> 1 coercion.

Safety and compatibility

No ledger/wire format or API changes. This is a node-process threading/config behaviour change only, with no impact on mixed-version operation, recovery, or consensus safety: node_inbound, ledger entry range, and tick message handling on the dispatch thread are unchanged, only the (unrelated) task-draining loop that used to run alongside them is removed.
Behaviour change: applications/tasks that used to opportunistically run on the dispatch thread when worker_threads=0 now always run on a dedicated worker thread. Existing configurations with worker_threads: 0 keep working (coerced to 1, logged) rather than being rejected, so this is not a breaking change for a patch release; new/default configurations get worker_threads=1.
No new security-sensitive surface: task execution moves entirely off the consensus-ingress thread, which is a defense-in-depth improvement (opaque/blocking tasks can no longer stall ringbuffer processing or elections).

Copilot

🟡 Changes recommended

The dispatch loop now unconditionally waits on a coalesced work beacon each iteration, which can introduce avoidable ingress latency when read_n hits its per-iteration budget and there is still queued ringbuffer work.

Get a fresh assessment by requesting another Copilot review.

Pull request overview

This PR updates CCF’s threading/configuration defaults so the enclave dispatch thread (Enclave::run_main) is ingress-only, and task execution always happens on dedicated worker thread(s). It raises the effective minimum/default worker_threads to ensure there is always at least one task executor, while preserving compatibility by coercing worker_threads: 0 to 1.

Changes:

Make the dispatch thread ingress-only by removing task draining from Enclave::run_main and relying on run_worker threads for task execution.
Raise the default worker_threads to 1 across code, schema, build defaults, tests, and sample configs; coerce 0 -> 1 in host config validation with a log message.
Update documentation and release notes to describe the new default and coercion behavior.

Custom instructions used (custom):

/.github/copilot-instructions.md
/.github/instructions/changelog.instructions.md
/.github/instructions/reviewing.instructions.md

File summaries

File	Description
tests/infra/e2e_args.py	Update CLI default `--worker-threads` to 1 for e2e runs.
src/host/run.cpp	Coerce `worker_threads < 1` to 1 during config processing.
src/enclave/enclave.h	Remove task draining from dispatch loop; keep worker threads as task executors.
samples/config/start_config.json	Update sample `worker_threads` to 1.
samples/config/recover_config.json	Update sample `worker_threads` to 1.
samples/config/join_config.json	Update sample `worker_threads` to 1.
include/ccf/node/startup_config.h	Update `worker_threads` default to 1 and document coercion behavior.
doc/operations/resource_usage.rst	Document default 1 and `0 -> 1` coercion.
doc/host_config_schema/host_config.json	Update schema default/description for `worker_threads`.
doc/architecture/threading.rst	Document default 1 and `0 -> 1` coercion.
CMakeLists.txt	Update cached WORKER_THREADS default to 1 for test args.
CHANGELOG.md	Add release note entry for new default/coercion behavior.

Review details

Files reviewed: 12/12 changed files
Comments generated: 1
Review effort level: Lite

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The enclave dispatch thread (Enclave::run_main) previously drained up to 256 tasks from the main job board on every iteration, in addition to draining the inbound ringbuffer. This was a compatibility bodge from the old task system: it let opaque, potentially blocking tasks (ledger fsync, TLS work, historical deserialisation, ...) execute on the consensus ingress thread, and with worker_threads=0 that thread was the only task executor. run_main() is now ingress-only: it waits on the work beacon, drains ringbuffer messages (node-to-node inbound, ticks), and handles stop/stop-notice. Task execution happens exclusively on run_worker() host threads. The job board no longer needs to wake the dispatch thread when tasks become available, so the work beacon is no longer wired into JobBoard::set_work_beacon from the Enclave constructor. Since the host libuv loop is not a suitable task executor either (blocking tasks there would stall node-to-node and RPC socket polling), there must always be at least one run_worker thread. worker_threads now defaults to 1: - include/ccf/node/startup_config.h and doc/host_config_schema/host_config.json (and the config_schema.h generated from it) declare the new default. - CMakeLists.txt's WORKER_THREADS cache variable and tests/infra/e2e_args.py's --worker-threads default are updated to match, along with the sample configuration files. To avoid a breaking change in a patch release, worker_threads: 0 is not rejected: src/host/run.cpp's validate_and_coerce_worker_threads coerces it up to 1 and logs a LOG_FAIL_FMT message noting the substitution, before the node starts or --check returns. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…aise-worker-threads-minimum-to-one

github-actions · 2026-09-21T19:50:45Z

Description

Comparing 1 available run from this branch (#8404) against the trend of the last 30 main runs.

Each chart plots every benchmark as an axis, with values normalized so 100 is the EWMA baseline of recent main runs, using a 7-run half-life. The orange line is this branch's latest run; the darker blue band is the main baseline +/- 1 std dev and the lighter blue band around it is +/- 2 std dev.

Axis labels show the latest branch value and its difference from the main EWMA baseline, where 0% is on the baseline. They are coloured green where the latest run improves on the baseline, red where it regresses, and grey where the difference is within one std dev of the baseline (within noise). Higher is better for throughput and rate, lower for latency and memory.

A benchmark which does not exist on main yet has no baseline of its own, so its earliest available run from this branch is used as its reference and its band is measured across this branch's runs. Its axis is normalized, scaled and coloured like any other, but the comparison is against this branch rather than against main.

Throughput (tx/s)

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  axis b0["Basic Blocking 100ms: 3,061 tx/s ▼ 1%"]
  axis b1["Basic Blocking 20ms: 15,199 tx/s ▬ -1%"]
  axis b2["Basic Blocking 2ms: 39,923 tx/s ▼ 22%"]
  axis b3["Basic JS: 12,536 tx/s ▼ 20%"]
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Latency (ms)

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Memory (bytes)

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Rate (ops/s)

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Eddy Ashton (eddyashton) requested a review from a team as a code owner September 18, 2026 15:29

Copilot AI lite review requested due to automatic review settings September 18, 2026 15:29

Copilot started reviewing on behalf of Eddy Ashton (eddyashton) September 18, 2026 15:30 View session

Eddy Ashton (eddyashton) force-pushed the agents/raise-worker-threads-minimum-to-one branch from a106afb to 5f579fd Compare September 18, 2026 15:31

Eddy Ashton (eddyashton) changed the title ~~host: Raise worker_threads default to 1, make dispatch thread ingress-only~~ Raise worker_threads default to 1, make dispatch thread ingress-only Sep 18, 2026

Eddy Ashton (eddyashton) changed the title ~~Raise worker_threads default to 1, make dispatch thread ingress-only~~ Raise worker_threads default to 1, make dispatch thread ingress-only Sep 18, 2026

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Comment thread src/enclave/enclave.h Outdated

Eddy Ashton (eddyashton) added the run-long-test Run Long Test job label Sep 18, 2026

Eddy Ashton (eddyashton) force-pushed the agents/raise-worker-threads-minimum-to-one branch from 5f579fd to 256cc10 Compare September 18, 2026 15:54

Amaury Chamayou (achamayou) approved these changes Sep 21, 2026

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Merge branch 'main' into agents/raise-worker-threads-minimum-to-one

3a7d96c

Eddy Ashton (eddyashton) marked this pull request as draft September 21, 2026 14:17

Merge branch 'main' of https://github.com/microsoft/CCF into agents/r…

b8df5e4

…aise-worker-threads-minimum-to-one

Eddy Ashton (eddyashton) marked this pull request as ready for review September 21, 2026 15:53

Merge branch 'main' into agents/raise-worker-threads-minimum-to-one

2c53ddd

Amaury Chamayou (achamayou) enabled auto-merge (squash) September 21, 2026 16:09

Amaury Chamayou (achamayou) merged commit 4fa6651 into main Sep 21, 2026
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Amaury Chamayou (achamayou) deleted the agents/raise-worker-threads-minimum-to-one branch September 21, 2026 16:24

Amaury Chamayou (achamayou) added the bench-ab label Sep 21, 2026

Eddy Ashton (eddyashton) mentioned this pull request Sep 22, 2026

Restore task execution capacity for all worker thread configurations #8411

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Raise `worker_threads` default to 1, make dispatch thread ingress-only - #8404

Raise `worker_threads` default to 1, make dispatch thread ingress-only#8404
Amaury Chamayou (achamayou) merged 4 commits into
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Eddy Ashton (eddyashton) commented Sep 18, 2026 •

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Throughput (tx/s)

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3 participants

Eddy Ashton (eddyashton) commented Sep 18, 2026 •

edited

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