One Model, Many Skills: Parameter-Efficient Fine-Tuning for Multitask Code Analysis

• URL: http://arxiv.org/abs/2603.09978v1
• Date: Tue, 03 Feb 2026 15:07:11 GMT
• Title: One Model, Many Skills: Parameter-Efficient Fine-Tuning for Multitask Code Analysis
• Abstract summary: We present the first comprehensive evaluation of multi-task PEFT for code analysis.<n>Our experiments show that a single PEFT module can match, and in some cases surpass, full multi-task fine-tuning.<n>We benchmark efficient multi-task PEFT against direct prompting of open-source general-purpose LLMs.
• Score: 21.26459132144385
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Large language models have recently surpassed specialized systems on code generation, yet their effectiveness on other code-analysis tasks remains less clear. At the same time, multi-task learning offers a way to unify diverse objectives within a single model, but fully fine-tuning LLMs across tasks is computationally prohibitive. Parameter-efficient fine-tuning mitigates this cost by updating only a small fraction of weights. Although PEFT has proven effective in single-task settings, its potential for multi-task learning has not yet been systematically explored. We present the first comprehensive evaluation of multi-task PEFT for code analysis, comparing several methods across diverse tasks and model architectures. Our experiments show that a single PEFT module shared across tasks can match, and in some cases surpass, full multi-task fine-tuning, confirming that the benefits of PEFT extend beyond isolated tasks. When comparing single-task and multi-task setups, we find that multi-task PEFT achieves a favorable performance-efficiency trade-off: it delivers accuracy close to single-task fine-tuning while reducing storage requirements, cutting the number of trainable parameters by a factor of the task count, and lowering computation costs by as much as 85%. At the same time, multi-task gains remain sensitive to task grouping. Through task-pairing experiments, we identify key factors shaping outcomes: task stability, model architecture, task complementarity, asymmetry, and dataset quality determine the success of co-fine-tuning. Finally, we benchmark efficient multi-task PEFT against direct prompting of open-source general-purpose LLMs, including DeepSeek, Qwen, Mistral, CodeLlama, and StarCoder. Despite their strong performance in code generation, these models underperform on analysis tasks, where even a 1B-parameter model with multi-task PEFT achieves significantly better results.

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