LLM Infrastructure Planner: A Tool for Estimating Hardware Requirements for Local LLM Deployment

LLM Infrastructure Planner (llm-infra-planner) is an open-source tool designed to help users estimate the GPU, VRAM, memory, disk, and system configurations required to run or train large language models (LLMs) locally. It addresses the pain point of difficult hardware configuration during local LLM deployment, provides multi-dimensional resource estimation and scenario-based recommendations, and offers a scientific basis for decision-making for individual developers and enterprise users, avoiding blind trial-and-error and resource waste.

Local deployment of large language models has become a trend due to data privacy, cost control, or fine-tuning needs, but hardware configuration challenges are widespread: factors such as model parameters, quantization precision, and context length affect resource requirements—over-configuration leads to waste, while under-configuration causes performance bottlenecks. Without professional guidance, users often rely on experience for trial-and-error. llm-infra-planner was created precisely to address this pain point.

Core Features

• Multi-dimensional resource estimation: Covers requirements for GPU (computing power matching, tensor parallelism, etc.), VRAM (weights, KV Cache, etc.), memory (data loading, concurrent allocation, etc.), and storage (model files, datasets, etc.).
• Scenario-based configuration recommendations: Provides solutions for inference (interactive/batch processing/API services), training (full-parameter fine-tuning/LoRA/pre-training), and edge deployment (consumer-grade GPU/CPU inference).

Technical Principles

• Estimation model: Based on industry formulas (e.g., VRAM = model weights + KV Cache + activation values + overhead) and actual measurement data.
• Database support: Built-in databases for GPUs (NVIDIA consumer/professional grade, etc.) and models (Llama/GPT/Mistral, etc.).
• Interactive design: Offers a command-line interface (suitable for technical users) and an interactive wizard (guides non-technical users).

Application Value

• Hardware procurement: Avoids over- or under-configuration, supports multi-solution comparison and ROI analysis.
• Existing resource evaluation: Determines the model size supported by current devices, optimal quantization strategy, and upgrade path.
• Cloud resource planning: Estimates cloud instance specifications, operating costs, and optimizes resource allocation.

Typical Cases

1. Private deployment for small and medium enterprises: Llama-2-70B (INT8) requires 2×A100 80GB, 256GB memory, 500GB SSD, with performance of approximately 15 tokens per second.
2. Individual developer experiments: Llama-2-13B (QLoRA 4-bit) uses RTX3090 24GB, 64GB memory; bitsandbytes optimization is recommended.
3. Edge device deployment: Jetson AGX Orin can run a 7B INT4 model (32GB shared memory) with performance of approximately 5 tokens per second; smaller models like TinyLlama are recommended.

Estimation Limitations

• There are differences between theoretical values and actual results (affected by drivers, frameworks, and optimizations).
• Based on best-case assumptions; additional overhead may exist in practice.
• Models and hardware are evolving rapidly; the database needs continuous updates.

Usage Recommendations

• Provide detailed input parameters.
• Refer to comparisons of multiple similar configurations.
• Reserve 20-30% resource margin.
• Actual testing and verification are required for critical scenarios.

Community Contributions

The tool's accuracy depends on community data: collection of actual performance data, addition of new models/hardware, and evaluation of framework optimization impacts.

Expansion Directions

• Support more hardware (AMD, Apple Silicon, etc.).
• Integrate more inference framework optimizations.
• Add cost estimation (electricity fees, cloud costs).
• Develop a web interface to improve usability.

Comparison with Similar Tools

Feature	llm-infra-planner	Other Tools
Open-source	Yes	Partial
Localization	Fully local operation	Partially dependent on API
Training support	Yes	Partial
Multi-hardware	Gradually expanding	Usually NVIDIA-focused
Usability	Medium-high	Varies

llm-infra-planner fills the gap in hardware requirement estimation for LLM deployment and provides a scientific basis for decision-making for local deployment users. As the open-source LLM ecosystem develops, its value will become increasingly prominent. It is recommended that individual developers and enterprise users planning local LLM deployment include this tool in their references to optimize resource configuration and reduce trial-and-error costs.