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

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

November 14, 2026 at 11:09 pm #14224
Gabriel Garcia
Community Contributor
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.

MacBook Pro 14″ M4 Pro (48GB) | iPhone 15 Pro | iPad Air M2 | Montreal, QC
Apple Certified Support Professional (ACSP) | iOS / Swift Engineer