llama-cpp

---
name: llama-cpp
description: "Run GGUF models directly, load LoRA adapters, benchmark inference speed, and serve models via llama-server using llama.cpp. Includes Qwen 3.5 serve scripts (9B dense + F16, 35B MoE) with asymmetric KV cache and thinking mode. Secondary to Ollama; use when needing direct model control or LoRA hot-loading. Triggers on 'llama.cpp', 'GGUF', 'LoRA adapter', 'benchmark inference', 'llama-server'."
user-invocable: false
---

# llama.cpp - Secondary Inference Engine

Direct access to llama.cpp for faster inference, LoRA adapter loading, and benchmarking on Apple Silicon. Ollama remains primary for RLAMA and general use; llama.cpp is the power tool.

## Prerequisites

```bash
brew install llama.cpp
```

Binaries: `llama-cli`, `llama-server`, `llama-embedding`, `llama-quantize`

## Quick Reference

### Resolve Ollama Model to GGUF Path

To avoid duplicating model files, resolve an Ollama model name to its GGUF blob path:

```bash
~/.claude/skills/llama-cpp/scripts/ollama_model_path.sh qwen2.5:7b
```

### Run Inference

```bash
GGUF=$(~/.claude/skills/llama-cpp/scripts/ollama_model_path.sh qwen2.5:7b)
llama-cli -m "$GGUF" -p "Your prompt here" -n 128 --n-gpu-layers all --single-turn --simple-io --no-display-prompt
```

### Start API Server

To start an OpenAI-compatible server (port 8081, avoids Ollama's 11434):

```bash
~/.claude/skills/llama-cpp/scripts/llama_serve.sh <model.gguf>

# Or with options:
PORT=8082 CTX=8192 ~/.claude/skills/llama-cpp/scripts/llama_serve.sh <model.gguf>
```

Test the server:
```bash
curl http://localhost:8081/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{"model":"default","messages":[{"role":"user","content":"Hello"}]}'
```

### Serve Qwen3.5

Dedicated servers for Qwen3.5 models with asymmetric KV cache, jinja templates, and thinking mode.

**9B Dense (recommended for 24-36GB systems):**

```bash
# Default: Qwen3.5-9B, thinking mode, 32K context
~/.claude/skills/llama-cpp/scripts/llama_serve_qwen35_9b.sh

# Full precision F16 (~17.9 GB, zero quantization loss)
~/.claude/skills/llama-cpp/scripts/llama_serve_qwen35_9b.sh ~/models/Qwen3.5-9B-BF16.gguf

# Non-thinking mode, shorter context
THINK=0 CTX=8192 ~/.claude/skills/llama-cpp/scripts/llama_serve_qwen35_9b.sh
```

**35B MoE (for 64+ GB systems):**

```bash
~/.claude/skills/llama-cpp/scripts/llama_serve_qwen35.sh  # defaults to qwen3.5:35b-a3b
```

9B Q4 uses ~6.6 GB (ample headroom); F16 uses ~17.9 GB (fits with 32K context on 36GB). Asymmetric KV cache (q8_0 keys + q4_0 values) saves ~60% KV memory vs FP16 cache.

#### F16 (Full Precision) Mode

For maximum quality (zero quantization loss), download and serve the BF16 GGUF:

```bash
# Download once (~17.9 GB)
huggingface-cli download unsloth/Qwen3.5-9B-GGUF "Qwen3.5-9B-BF16.gguf" --local-dir ~/models

# Serve F16
~/.claude/skills/llama-cpp/scripts/llama_serve_qwen35_9b.sh ~/models/Qwen3.5-9B-BF16.gguf
```

F16 vs Q4 on M4 Max 36GB:

| | Q4_K_M (default) | BF16 (F16) |
|---|---|---|
| Size | 6.6 GB | 17.9 GB |
| Speed | ~38 tok/s | ~8-12 tok/s |
| Quality | ~99.5% | 100% (reference) |
| Max context | 262K | ~32K comfortable |

### Benchmark (llama.cpp vs Ollama)

```bash
~/.claude/skills/llama-cpp/scripts/llama_bench.sh qwen2.5:7b
```

Reports prompt processing and generation tok/s for both engines side by side.

### LoRA Adapter Inference

Load a LoRA adapter dynamically on top of a base GGUF model (no merge required):

```bash
~/.claude/skills/llama-cpp/scripts/llama_lora.sh <base.gguf> <lora.gguf> "Your prompt"
```

This is the key advantage over Ollama: hot-swap LoRA adapters without rebuilding models.

### Convert Kothar LoRA to GGUF

Convert HuggingFace LoRA adapters from the Kothar training pipeline into a merged GGUF model:

```bash
python3 ~/.claude/skills/llama-cpp/scripts/convert_lora_to_gguf.py \
  --base NousResearch/Hermes-2-Mistral-7B-DPO \
  --lora <path-or-hf-id> \
  --output kothar-q4_k_m.gguf \
  --quantize q4_k_m
```

## When to Use llama.cpp vs Ollama

| Task | Use |
|------|-----|
| RLAMA queries | Ollama (native integration) |
| Quick model chat | Ollama (`ollama run`) |
| LoRA adapter testing | llama.cpp (`llama_lora.sh`) |
| Benchmarking tok/s | llama.cpp (`llama_bench.sh`) |
| Maximum inference speed | llama.cpp (10-20% faster) |
| Custom server config | llama.cpp (`llama_serve.sh`) |
| Embedding generation | Either (Ollama simpler, llama-embedding more control) |
| Kothar GGUF conversion | llama.cpp (`convert_lora_to_gguf.py`) |

## Architecture

```
Ollama (primary, port 11434)          llama.cpp (secondary, port 8081)
├── RLAMA RAG queries                 ├── LoRA adapter hot-loading
├── Model management (pull/list)      ├── Benchmarking
├── General chat                      ├── Custom server configs
└── Embeddings (nomic-embed-text)     └── Kothar GGUF conversion

Both share the same GGUF model files (~/.ollama/models/blobs/)
```

## Subprocess Best Practices (Build 8180+)

When calling llama-cli from scripts or subprocesses:
- **Always use `--single-turn`** — generates one response then exits (prevents interactive chat mode hang)
- **Always use `--simple-io`** — suppresses ANSI spinner that floods redirected output
- **Always use `--no-display-prompt`** — suppresses prompt echo
- **Use `--n-gpu-layers all`** instead of legacy `-ngl 999`
- **Use `--flash-attn on`** (not bare `--flash-attn`) — now takes argument
- **Timing stats** appear in stdout as `[ Prompt: X t/s | Generation: Y t/s ]` (via `--show-timings`, default: on)
- **Redirect stderr to file, not variable** — spinner output can overflow bash variables

• README.md 4 KB
• SKILL.md 6 KB
• scripts/convert_lora_to_gguf.py 9 KB
• scripts/convert_to_train_txt.py 5 KB
• scripts/eval_local.sh 5 KB
• scripts/llama_bench.sh 3 KB
• scripts/llama_lora.sh 2 KB
• scripts/llama_serve.sh 1 KB
• scripts/llama_serve_qwen35.sh 2 KB
• scripts/llama_serve_qwen35_9b.sh 2 KB
• scripts/ollama_model_path.sh 2 KB
• scripts/train_local.sh 5 KB