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49 lines
1.8 KiB
Markdown
49 lines
1.8 KiB
Markdown
---
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id: TASK-81
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title: 'Tokenization performance: disable Yomitan MeCab parser, gate local MeCab init, and add persistent MeCab process'
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status: Done
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assignee: []
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created_date: '2026-03-02 07:44'
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updated_date: '2026-03-02 07:46'
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labels: []
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dependencies: []
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priority: high
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ordinal: 9001
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---
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## Description
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<!-- SECTION:DESCRIPTION:BEGIN -->
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Reduce subtitle annotation latency by:
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- disabling Yomitan-side MeCab parser requests (`useMecabParser=false`);
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- initializing local MeCab only when POS-dependent annotations are enabled (N+1 / JLPT / frequency);
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- replacing per-line local MeCab process spawning with a persistent parser process that auto-shuts down after idle time and restarts on demand.
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<!-- SECTION:DESCRIPTION:END -->
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## Acceptance Criteria
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<!-- AC:BEGIN -->
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- [x] #1 Yomitan parse requests disable MeCab parser path.
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- [x] #2 MeCab warmup/init is skipped when all POS-dependent annotation toggles are off.
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- [x] #3 Local MeCab tokenizer uses persistent process across subtitle lines.
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- [x] #4 Persistent MeCab process auto-shuts down after idle timeout and restarts on next tokenize activity.
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- [x] #5 Tests cover parser flag, warmup gating, and persistent MeCab lifecycle behavior.
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<!-- AC:END -->
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## Final Summary
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<!-- SECTION:FINAL_SUMMARY:BEGIN -->
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Implemented tokenizer latency optimizations:
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- switched Yomitan parse requests to `useMecabParser: false`;
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- added annotation-aware MeCab initialization gating in runtime warmup flow;
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- added persistent local MeCab process (default idle shutdown: 30s) with queued requests, retry-on-process-end, idle auto-shutdown, and automatic restart on new work;
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- added regression tests for Yomitan parse flag, MeCab warmup gating, and persistent/idle lifecycle behavior;
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- validated with targeted tests and `tsc --noEmit`.
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<!-- SECTION:FINAL_SUMMARY:END -->
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