Building a Specialized Rust Debugging Assistant with Ollama

Building a Specialized Rust Debugging Assistant with Ollama

Local AI development has reached a point where developers can create powerful, specialized tools running entirely on their own hardware. In this guide, we'll build a sophisticated Rust debugging assistant using Ollama and the Qwen2.5-Coder model.

Model Configuration

Here's our complete model configuration:

FROM qwen2.5-coder:32b

# GPU Optimization Parameters
PARAMETER num_gpu 1

# Model Behavior Parameters
PARAMETER temperature 0.7
PARAMETER num_ctx 32768
PARAMETER repeat_penalty 1.1
PARAMETER top_p 0.8
PARAMETER stop "</error>"
PARAMETER stop "</trace>"
PARAMETER stop "</fix>"

# System Configuration
SYSTEM """You are a specialized Rust debugging assistant powered by Qwen2.5-Coder. Your expertise is:
1. Rust compiler analysis and error resolution
2. Memory safety and lifetime diagnostics
3. Performance bottleneck detection
4. Code smell identification
Keep solutions concise and practical."""

# Response Template
TEMPLATE """{{ if .System }}{{ .System }}{{ end }}
{{if .Prompt}}Code:
{{ .Prompt }}
<trace>{{ .Response }}</trace>
<fix>{{ .Response }}</fix>{{end}}"""

Key Components Explained

Base Model Selection

• Using qwen2.5-coder:32b as the foundation
• Optimized for coding and technical analysis

Hardware Optimization

• num_gpu: Configured for single GPU usage
• num_ctx: Large context window (32768 tokens) for handling extensive code samples

Response Control

• temperature: 0.7 for balanced creativity and precision
• repeat_penalty: 1.1 to prevent repetitive suggestions
• top_p: 0.8 for focused yet diverse solutions

Specialized Stop Tokens

PARAMETER stop "</error>"
PARAMETER stop "</trace>"
PARAMETER stop "</fix>"

These tokens help structure the assistant's responses into distinct sections.

Template Structure

The template ensures consistent formatting:

• System context preservation
• Code input handling
• Structured response with trace and fix sections

Building and Testing

1. Save the configuration:

nano rust.debugger.prompt

2. Create the model:

ollama create rust-debugger -f rust.debugger.prompt

3. Test with a simple case:

fn main() {
    let x = 1
    println!("Hello, world!");
}

Example Usage

ollama run rust-debugger

The assistant will analyze your code with:

• Compiler error analysis
• Memory safety checks
• Performance insights
• Code quality suggestions

Advanced Features

The model excels at:

1. Compiler Analysis: Detailed breakdown of Rust-specific errors
2. Memory Diagnostics: Understanding lifetime and ownership issues
3. Performance Analysis: Identifying potential bottlenecks
4. Code Quality: Detecting and suggesting improvements for code smells

Conclusion

This customized Ollama model demonstrates how developers can create specialized, local AI tools. By leveraging the Qwen2.5-Coder model and careful parameter tuning, we've created a powerful Rust debugging assistant that runs entirely on local hardware.

The combination of GPU optimization, context handling, and specialized response templates makes this tool particularly effective for Rust development workflows. The ability to run locally while maintaining high-quality analysis capabilities makes it a valuable addition to any Rust developer's toolkit.