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James RussoandClaude Opus 4.6 9115d7364c feat(producer): add request-level render concurrency semaphore (#232)
Add a FIFO semaphore to limit concurrent renders in the producer server,
preventing Chrome CPU contention that causes beginFrame failures.

- New Semaphore utility class (packages/producer/src/utils/semaphore.ts)
- Both blocking render and SSE renderStream handlers acquire/release the semaphore
- SSE stream sends a "queued" event when request must wait
- New GET /render/queue endpoint exposes active/queued render counts
- Configurable via HandlerOptions.maxConcurrentRenders or PRODUCER_MAX_CONCURRENT_RENDERS env var (default: 2)
- New --max-concurrent-renders CLI flag (1-10)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-09 11:25:32 -07:00
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