Glacier.Inference.Distributed 1.1.0

Glacier.Inference.Distributed

<p align="center"> <h3>Distributed Heterogeneous Pipeline Inference & Cluster Interconnect for .NET 10</h3> </p>

========================================================================================================
  GLACIER.INFERENCE.DISTRIBUTED: HETEROGENEOUS CLUSTER LLM RUNTIME (PURE C# .NET 10)
========================================================================================================
  Interconnect Overhead     :  Fused 64-byte aligned socket framing (ClusterFrameHeader + FusedActivationHeader)
  Wire Latency              :  0.45 ms per LAN hop (1000BASE-T Gigabit) / 0.013 ms loopback
  Wire Precision Protocol   :  Dynamic FP32, FP16, and Symmetric INT8 (5,124 bytes/token, 75% bandwidth reduction)
  Compute Prefill Speed     :  52.46 tok/s (6.19x speedup vs 8.48 tok/s baseline) via Batched SIMD/GEMM
  Speculative Decode Speed  :  23.24 tok/s (1.25x speedup vs 18.52 tok/s baseline) with 2-stage async overlap
  VRAM Safety Invariant     :  >= 2.59 GB dedicated VRAM free headroom on Host RTX 4060 (DXGI 1.4 verified)
  Memory & GC Invariant     :  0 Gen 0/1/2 GC collections, 0 bytes managed heap allocation on hot decode loop
  Physically Verified Model :  DeepSeek-R1-Distill-Qwen-14B-Q4_K_M (14.77B params, 48 layers, 27:21 Pareto split)
  Heterogeneous Fleet Nodes :  NVIDIA Discrete GDDR6 (RTX 4060/3060) + AMD Ryzen Zen 5 AVX-512 + Radeon iGPU
========================================================================================================

What is Glacier.Inference.Distributed?

📖 Read the deep dive article on DEV.to: Want to Run Massive AI Models on a Collection of Home PCs?

Glacier.Inference.Distributed partitions massive open Large Language Models and Mixture-of-Experts (MoE) architectures (such as Qwen2-57B and Mixtral-8x22B 141B) across arbitrary $N$-machine clusters on a standard local area network (LAN).

Instead of requiring expensive enterprise datacenter servers or 80GB VRAM GPUs, Glacier distributes model layers across existing home, office, or lab hardware:

• Discrete GPUs (NVIDIA RTX 4060, RTX 3060, etc. via Direct3D 12 / CUDA)
• Integrated APUs / iGPUs (AMD Radeon 680M / 780M / 890M with Unified DDR5 Memory)
• High-Core CPUs (AMD Ryzen Zen 4/Zen 5 or Intel AVX-512 multithreaded SIMD)

Activation tensors are streamed sequentially through pipeline stages over low-latency TCP frames using System.IO.Pipelines and 32-byte binary wire headers, achieving over 99.8% compute utilization with negligible network transit overhead (~7.9 ms per token across the cluster).

graph TD
    subgraph Host ["Node 0: Coordinator & Root Stage (Host Laptop - RTX 4060)"]
        In[Token IDs] --> Embed[Embedding / Norm]
        Embed --> Attn0[Root Attention Blocks 0..N1]
        Attn0 --> Gate[Router Gating]
    end

    subgraph Node1 ["Node 1: Intermediate Worker (Beast - RTX 3060 12GB)"]
        Attn1[Transformer Blocks N1+1..N2]
    end

    subgraph Node2 ["Node 2: APU Unified Memory Worker (MinisForum - Radeon 680M)"]
        Attn2[Transformer Blocks N2+1..N3]
    end

    subgraph Node3 ["Node 3: CPU Warm Expert Pool (Fedora Linux - Zen 5 AVX-512)"]
        Attn3[Final Transformer Blocks N3+1..End]
        Head[LM Head & Logits]
    end

    Host -- "Zero-Copy Wire Frame (32B Header + FP32 Activation)" --> Node1
    Node1 -- "Updated Activation Frame (System.IO.Pipelines)" --> Node2
    Node2 -- "Updated Activation Frame (TCP Socket)" --> Node3
    Node3 -- "Logits / Next Token ID" --> Host

Complete Turnkey Setup & Cluster Run Guide

Here is the complete step-by-step walkthrough to run a 57B or 141B model across 2, 3, or 4 nodes on your network.

Prerequisites

1. .NET 10 SDK installed on all cluster nodes (Download .NET 10).
2. Local Area Network (LAN): All machines connected via gigabit Ethernet or Wi-Fi (e.g. 192.168.1.x subnet).
3. Zero Python / Zero C++ dependencies: 100% pure C# .NET 10 runtime, downloader, and interconnect.

Step 1: Clone the Repository on Every Node

Clone the repository on the coordinator machine and each worker machine:

git clone https://github.com/ian-cowley/Glacier.Inference.Distributed.git
cd Glacier.Inference.Distributed

Step 2: Download the GGUF Model (Pure C# / Native Shells)

Glacier provides a pure C# multi-stream HTTP Range downloader built directly into the CLI (glacier-distributed download). It opens 8 concurrent HTTP/2 sockets to saturate gigabit connections (70–110 MB/s), pre-allocating sparse files on disk with zero temporary parts:

A. Download via Pure C# (.NET CLI)

# 1. Download Qwen2-57B-A14B (25.62 GB, 28 Layers, 64 Experts)
dotnet run --project src/Glacier.Inference.Distributed.Cli -c Release -- download qwen2-57b

# 2. Download Mixtral-8x22B-Instruct (35.29 GB, 141B Params, 56 Layers @ IQ2_XXS)
dotnet run --project src/Glacier.Inference.Distributed.Cli -c Release -- download mixtral-8x22b

# 3. Download Any Custom Hugging Face GGUF Model
dotnet run --project src/Glacier.Inference.Distributed.Cli -c Release -- download "https://huggingface.co/path/to/model.gguf"

B. Download via Native OS Shell Scripts

If you prefer native shell scripts without building the CLI first:

# Windows (PowerShell):
.\scripts\download_model.ps1 qwen2-57b
.\scripts\download_model.ps1 mixtral-8x22b

# Linux / macOS (Bash):
./scripts/download_model.sh qwen2-57b
./scripts/download_model.sh mixtral-8x22b

Step 3: Start Worker Nodes (Node 1, Node 2, Node 3...)

On each remote machine, run the worker daemon. The worker automatically detects local hardware (NVIDIA GPU, AMD Radeon iGPU, or AVX-512 CPU):

On Worker Node 1 (e.g. 192.168.1.108):

dotnet run --project src/Glacier.Inference.Distributed.Cli -c Release -- \
  --role worker \
  --port 5055

On Worker Node 2 (e.g. 192.168.1.101):

dotnet run --project src/Glacier.Inference.Distributed.Cli -c Release -- \
  --role worker \
  --port 5056

On Worker Node 3 (e.g. 192.168.1.200):

dotnet run --project src/Glacier.Inference.Distributed.Cli -c Release -- \
  --role worker \
  --port 5057

Firewall Note: Ensure the selected port (e.g. 5055) is open in your machine's firewall:

• Windows (PowerShell as Admin): New-NetFirewallRule -DisplayName "Glacier Worker" -Direction Inbound -LocalPort 5055 -Protocol TCP -Action Allow
• Linux: sudo ufw allow 5055/tcp

The worker will output:

[Worker] Initialized D3D12 Device: NVIDIA GeForce RTX 3060 (12288 MB Dedicated VRAM)
[Worker] GPU Shaders & VRAM Buffers ready.
[Worker] Ready & listening on 0.0.0.0:5055 (NoDelay=true)...

Step 4: Launch the Coordinator (Node 0 / Client)

On your main workstation or laptop (Coordinator), run the coordinator with --stages pointing to your worker IP addresses:

A. Running Qwen2-57B Across 4 Nodes

dotnet run --project src/Glacier.Inference.Distributed.Cli -c Release -- \
  --role coordinator \
  --stages 192.168.1.108:5055,192.168.1.101:5056,192.168.1.200:5057 \
  --model ./models/qwen2-57b-a14b-instruct-q3_k_m.gguf \
  --tokens 25 \
  --prompt "Mixture-of-Experts enables scaling parameter capacity across distributed home clusters by"

The coordinator will:

1. Auto-inspect the GGUF file (Arch: qwen2moe, Layers: 28, Dim: 3584).
2. Evenly slice the 28 layers: 7 layers per node.
3. Connect over TCP to each worker and stream activations in a pipeline loop.
4. Output generated tokens in real time and display the complete hardware telemetry breakdown.

B. Running Mixtral-8x22B (141B Parameters) Across 4 Nodes

dotnet run --project src/Glacier.Inference.Distributed.Cli -c Release -- \
  --role coordinator \
  --stages 192.168.1.108:5055,192.168.1.101:5056,192.168.1.200:5057 \
  --model ./models/Mixtral-8x22B-Instruct-v0.1.i1-IQ2_XXS.gguf \
  --tokens 25 \
  --prompt "Explain quantum computing in simple terms"

The coordinator auto-detects Layers: 56, Dim: 6144 and assigns 14 layers per node!

C. Running Across a 2-Node or 3-Node Sub-Cluster

You do not need 4 nodes. Glacier dynamically slices layers across any number of nodes:

# 2-Node Fast GPU Pair (Host RTX 4060 + Remote RTX 3060):
dotnet run --project src/Glacier.Inference.Distributed.Cli -c Release -- \
  --role coordinator \
  --stages 192.168.1.108:5055 \
  --model ./models/qwen2-57b-a14b-instruct-q3_k_m.gguf

Model Architecture & Sizing Reference

Tip: If you provide --model <path>, the CLI automatically inspects the GGUF file and sets --layers and --dim for you.

Physical Cluster Benchmark Results

Measured live across the 4 physical cluster nodes on a standard 1 Gbps LAN running qwen2-57b-a14b-instruct-q3_k_m.gguf (28 layers, 64 experts / 14B active parameters):

Per-Node Compute Breakdown:

• Stage 0 [Host Laptop - Ryzen AI 9 Zen 5 AVX-512]: Layers 0..6 (7L + Embeddings) → 791.64 ms
• Stage 1 [Beast - Ryzen 5 5500 Zen 3 AVX2]: Layers 7..13 (7L) → 1,105.50 ms (1.54 ms LAN)
• Stage 2 [MinisForum64 - Ryzen 9 6900HX Zen 3+ AVX2]: Layers 14..20 (7L) → 598.98 ms (1.76 ms LAN)
• Stage 3 [Fedora Linux - Ryzen AI 9 Zen 5 AVX-512]: Layers 21..27 (7L + Norm + LM Head) → 1,064.91 ms (4.59 ms LAN)

Architectural Realities:

1. Network Overhead is Negligible: Gigabit LAN latency (7.88 ms total) accounts for only 0.2% of the execution time.
2. CPU SIMD Memory Bus Bound: Evaluating 14B active parameters in pure CPU SIMD streams ~6.5 GB of weights through host DDR5/DDR4 per token.
3. GPU Offloading Path: Scaling throughput from 0.26 tok/s to 15–25 tok/s requires loading active layer weights into discrete GPU VRAM (RTX 4060 and RTX 3060) utilizing hardware tensor cores with 256–360 GB/s bandwidth.

Programmatic C# API Usage

You can also orchestrate distributed inference directly inside your own .NET 10 application:

using Glacier.Inference.Distributed;

// 1. Configure remote stage endpoints
var endpoints = new[]
{
    new StageEndpoint("192.168.1.108", 5055, "Beast RTX 3060"),
    new StageEndpoint("192.168.1.101", 5056, "MinisForum 680M"),
    new StageEndpoint("192.168.1.200", 5057, "Linux Zen 5 AVX-512")
};

// 2. Initialize the pipeline coordinator
using var coordinator = new DistributedPipelineCoordinator(
    stages: endpoints,
    modelPath: "models/Mixtral-8x22B-Instruct-v0.1.i1-IQ2_XXS.gguf");

// 3. Generate streaming tokens
await foreach (var token in coordinator.GenerateStreamAsync("What is heterogeneous computing?"))
{
    Console.Write(token);
}

Empirical Benchmark & Speculative Pipeline Overlap

The cluster runtime includes an automated end-to-end benchmark harness validating all 5 performance invariants against physical hardware:

dotnet run --project src/Glacier.Inference.Distributed.Cli -c Release -- --benchmark

Empirical Scorecard on DeepSeek-R1-Distill-Qwen-14B (48 Layers, Dim 5120)

Ecosystem Cross-References

Glacier.Inference.Distributed is part of the Glacier High-Performance Ecosystem:

• Glacier.Inference: Core single-node compute engine, tiered virtual memory, and SIMD/GPU quantization kernels.
• Glacier.Cluster: Pure C# distributed DAG scheduler, zero-allocation wire protocol, and P2P Arrow IPC shuffle bus.
• Glacier.Tensor: Strided N-D tensor engine and Autograd framework.

License

MIT License. Copyright (c) 2026 Ian Cowley.