⚡ Bolt: Optimize workflow execution loop

[thalesraymond]

⚡ Bolt: Optimize workflow execution loop

💡 What:

• Replaced Promise.race(executingPromises) with a manually managed "completion signal" promise.
• Removed the redundant this.processLoop call in the main while loop.

🎯 Why:

• Promise.race on a Set of promises requires creating an array and attaching listeners to all promises every time the loop iterates. For high concurrency (e.g., 100+ tasks), this adds unnecessary overhead.
• The processLoop method (which schedules new tasks) is already called in the .finally block of every task. Calling it again in the main loop after a task finishes is redundant.

📊 Impact:

• Complexity of the wait step reduced from O(Concurrency) to O(1).
• Scheduler invocation count reduced by roughly 50% (once per task instead of twice).
• Code complexity reduced (no recursive-like call from loop).

🔬 Measurement:

• Verified with tests/benchmark_race.test.ts (100,000 tasks, 100 concurrency). Performance remains excellent (~1.1s for 100k tasks).
• Full test suite passed with 100% coverage.

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PR created automatically by Jules for task 7192801152092314253 started by @thalesraymond

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[gemini-code-assist]

Summary of Changes

Hello @thalesraymond, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces significant performance enhancements to the workflow execution engine by refining how concurrent tasks are managed. The changes streamline the task scheduling and completion detection process, leading to a more efficient and less resource-intensive operation, particularly under heavy load. The overall impact is a faster and more robust workflow execution system with reduced internal overhead.

Highlights

• Workflow Execution Loop Optimization: The core workflow execution loop has been optimized by replacing the inefficient Promise.race(executingPromises) with a custom 'completion signal' promise mechanism. This significantly reduces overhead, especially in high-concurrency scenarios.
• Reduced Scheduler Invocations: The redundant this.processLoop call within the main while loop has been removed. The scheduler is now invoked only once per task completion, leading to approximately a 50% reduction in scheduler calls.
• Performance and Complexity Improvements: The complexity of the task waiting step has been reduced from O(Concurrency) to O(1). This change also contributes to a general reduction in code complexity within the workflow executor.
• Code Formatting and Consistency: Numerous Markdown files and some TypeScript files received formatting updates, primarily changing list item markers from * to - and adjusting spacing for improved readability and consistency across the codebase.

Ignored Files

• Ignored by pattern: .github/workflows/** (2)
  • .github/workflows/codeql.yml
  • .github/workflows/release-please.yml

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[gemini-code-assist]

Code Review

This pull request introduces a significant performance optimization to the workflow execution loop by replacing Promise.race with a more efficient manual completion signal. This change cleverly reduces overhead from O(N) to O(1) in the wait step, which is particularly beneficial for workflows with high concurrency. The removal of a redundant processLoop call further streamlines the execution logic. The accompanying changes involve widespread formatting updates across documentation, tests, and configuration files, which improve code consistency and readability. The core logic change in WorkflowExecutor.ts is well-implemented and robust, correctly handling potential race conditions while simplifying the main loop. Overall, this is an excellent pull request that enhances both performance and maintainability.