Perf: cut worker-thread saturation/CPU from session diffs, snapshots, SQLite contention, and event fanout (PR #48638 series) #49974

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1. AceRothstein71 commented on Sep 19, 2026

   

   AceRothstein71

   on Sep 19, 2026

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   Cross-links: sibling tracking issues #49974 (perf/runtime), #49975 (shell classifier H-L), #49976 (shell classifier M-P), #49977 (instance lifecycle), #49978 (MCP/schema), #49979 (server/SSE + event/db), #49980 (updater tooling). Integration PR: #48638. Original tracker: #49565.
2. opencodejr commented on Oct 28, 2026

   

   opencodejrBot

   on Oct 28, 2026

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   Thanks for putting this together and for working on performance with many parallel agents.

   As I understand it, you'd like to reduce worker-thread CPU use and stalls when many sessions or subagents run at once. The changes on your session-diff-events branch target permission matching, turn-diff recomputation, event fanout to TUI/server clients, snapshot churn and recovery, and SQLite contention. Maintainers will consider it. Since this is a broad set of changes, small focused PRs (one subsystem each), each with a workload others can rerun and before/after numbers, will be much easier to review than one integration branch.

   Related items:

   • Worker-thread saturation under concurrent sessions: permission matching, turn-diff recomputation, event fanout, snapshot churn #49565: the original tracker for the same worker-thread saturation problem (closed by the bot for not using the issue templates)
   • fix: harden session diffs, snapshots, and write paths; cut worker-thread stalls under parallel agents #48638: the integration PR this issue refers to (currently closed)
   • Durable event table bloats from repeated turn diff payloads #48641: event table bloat from repeated turn-diff payloads, which fix: harden session diffs, snapshots, and write paths; cut worker-thread stalls under parallel agents #48638 originally targeted
   • fix(opencode): evict message diff patches from the event payload #42771: an earlier PR that also removed diff patches from event payloads
   • Security: fail-closed shell classifier hardening (waves H-L of PR #48638 series) #49975, Security: shell classifier convergence waves M-P under v16-v20 adversarial audits (PR #48638 series) #49976, Lifecycle: reload/teardown safety for instances (bounded drains, interrupt-safe claims, reusable-reload wedge fix) #49977, MCP/schema: validation hardening + anchor-form $ref retention (PR #48638 series) #49978, Server/SSE + event/db hardening (audit-v7 and wave B findings) #49979, Tooling: fork-follow autopatcher (upstream + patch-replay, staging gate, rollback) - contribution proposal #49980: the sibling tracking issues for the other parts of the series