[HiCache] Minor fix on file storage backend

[xiezhq-hermann]

Motivation

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[gemini-code-assist]

Summary of Changes

Hello @xiezhq-hermann, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a minor but significant fix to the HiCache file storage backend. The primary goal is to enhance the uniqueness and robustness of file keys by integrating the model's name into the key generation process. This ensures better data isolation and prevents potential collisions in the file system, leading to a more reliable caching mechanism.

Highlights

• Enhanced File Key Suffix Generation: The mechanism for generating unique suffixes for file storage keys has been updated to incorporate the model name, alongside the tensor parallel rank and size. This change ensures that cached files are more distinctly identified, preventing potential naming conflicts when different models utilize the same storage backend.
• Improved Configuration Suffix Naming: The variable tp_suffix has been renamed to config_suffix to more accurately reflect its purpose, as it now includes comprehensive configuration details, including the model name.

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[gemini-code-assist]

Code Review

This pull request improves the HiCache file storage backend by incorporating the model name into the cache key suffix, which helps prevent cache collisions between different models. However, I've identified a critical issue where a None value for model_name would cause a server crash. I have provided a code suggestion to fix this.