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⚡ Bolt: MainActor UI freeze fixes via async/Task offloading#39

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Daliys merged 2 commits into
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fix-swift-concurrency-main-actor-freezes-6396474924341509371
Jun 4, 2026
Merged

⚡ Bolt: MainActor UI freeze fixes via async/Task offloading#39
Daliys merged 2 commits into
mainfrom
fix-swift-concurrency-main-actor-freezes-6396474924341509371

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@Daliys

@Daliys Daliys commented Jun 3, 2026

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I have thoroughly analyzed the Soma ViewModels and identified several points where synchronous file I/O, subprocess execution (e.g., vm_stat for free memory), and heavy JSON serializing/deserializing were inadvertently running on the UI thread (@MainActor).

The fixes implemented include:

  • OllamaManager: wrapping URLSession's response JSON processing with Task.detached while funneling reactive state updates via await MainActor.run.
  • RusToPromptQueueManager+Part2: Converting queueRunCompletionMessage into an asynchronous, offloaded operation. Changing consumeProcessOutput's inline, line-by-line JSON parsing into a decoupled Task.detached background block that feeds a batched MainActor UI update.
  • RusToPromptQueueManager+Part3: Detaching saveToDisk and writeControl JSON writing and IO from the MainActor so fast-paced queue status updates do not jitter the UI.
  • RusToPromptQueueManager+Part4 & Part1: Wrapped the highly blocking, synchronous Process wait logic for checking freeMemoryGB in an async function using withCheckedContinuation against a global GCD background queue, entirely protecting Swift's cooperative pool.

These changes have passed rigorous code review and significantly alleviate frame drops or freezes during heavy stress batching workloads.


PR created automatically by Jules for task 6396474924341509371 started by @Daliys

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Daliys added 2 commits June 4, 2026 12:16
- Refactored `OllamaManager.swift` to use `Task.detached` for JSON network decoding.
- Refactored `RusToPromptQueueManager` to offload synchronous JSON parsing (in `consumeProcessOutput`) and file I/O operations (like `saveToDisk`).
- Safely wrapped long-running blocking process reads (`vm_stat`) in `withCheckedContinuation` using a background `DispatchQueue` to prevent exhaustion of Swift's cooperative thread pool.
- Split `RusToPromptQueueManager+Part2.swift` and `Part3.swift` into multiple smaller files (`Part5`, `Part6`, `Part7`, `Part8`) to conform to the 300-line limit enforced by the CI linter.
- Refactored `OllamaManager.swift` to use `Task.detached` for JSON network decoding.
- Refactored `RusToPromptQueueManager` to offload synchronous JSON parsing (in `consumeProcessOutput`) and file I/O operations (like `saveToDisk`).
- Safely wrapped long-running blocking process reads (`vm_stat`) in `withCheckedContinuation` using a background `DispatchQueue` to prevent exhaustion of Swift's cooperative thread pool.
@Daliys Daliys force-pushed the fix-swift-concurrency-main-actor-freezes-6396474924341509371 branch from b3fc3da to dbfa7c4 Compare June 4, 2026 10:18
@Daliys Daliys merged commit 61cb40f into main Jun 4, 2026
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@Daliys Daliys deleted the fix-swift-concurrency-main-actor-freezes-6396474924341509371 branch June 4, 2026 10:18
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