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Reply To: [Solved] Mac Studio M2 Ultra encountering Local LLM / MLX Framework Unified Memory Allocation Out-of-Memory Panic after update (macOS Sequoia 15.1)

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Home › Forums › Apple Silicon, Terminal & Developer Tools › [Solved] Mac Studio M2 Ultra encountering Local LLM / MLX Framework Unified Memory Allocation Out-of-Memory Panic after update (macOS Sequoia 15.1) › Reply To: [Solved] Mac Studio M2 Ultra encountering Local LLM / MLX Framework Unified Memory Allocation Out-of-Memory Panic after update (macOS Sequoia 15.1)

November 14, 2026 at 10:37 pm #13664
Liam Zimmermann
Certified Tech (Lvl 5)
Apple Recommended / Verified Community Solution
This canonical solution was verified and marked as solved in the Apple Support Community archive.

Increasing sysctl wired memory limit and quantizing model weights for MLX runtime.

Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

  1. Increase sysctl wired unified memory limit: 
    sudo sysctl iogpu.wired_mem_limit=180000
  2. Load models using 4-bit or 8-bit quantization (e.g. mlx-lm.generate --model mlx-community/Llama-3-70B-4bit).
  3. Flush system unified cache before heavy inference passes: 
    sudo purge

Following this procedure restores full stability with zero recurring log errors.

Mac mini M4 Pro (48GB) | Studio Display | HHKB Professional Hybrid | Toronto, ON
Apple Certified Support Professional (ACSP) | Computer Science & Machine Learning Student