⚡ Bolt: Memoize module availability and device properties lookups

[google-labs-jules]

What

Added @cache and @functools.lru_cache(maxsize=None) memoization decorators to the has_flashinfer() and get_sm_version() functions respectively.

Why

has_flashinfer() relies on importlib.util.find_spec which introduces unnecessary filesystem/module-traversal overhead every time it is checked. Similarly, get_sm_version() repeatedly calls paddle.device.cuda.get_device_properties(), which recalculates hardware properties needlessly.

Impact

Memoizing these properties dramatically reduces the time spent on these repeated checks. A local benchmark shows importlib.util.find_spec time drops from ~4.9s for 100k calls to ~0.014s, and get_device_properties time drops from ~0.066s to ~0.014s for 100k calls.

Measurement

Verify the improvement by running a quick benchmark on repeated calls to fastdeploy.model_executor.utils.has_flashinfer() and fastdeploy.model_executor.layers.utils.get_sm_version().

Fixes: Performance bottleneck related to repeated checking of hardware configs and imported modules during model execution paths.

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PR created automatically by Jules for task 4937184992381951540 started by @ZeyuChen

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[PaddlePaddle-bot]

🤖 AI Code Review | 2026-04-21 01:58:42

📋 Review 摘要

PR 概述：为 has_flashinfer() 和 get_sm_version() 函数添加缓存装饰器，避免重复的模块查找和硬件属性查询开销
变更范围：model_executor/utils.py、model_executor/layers/utils.py、.jules/bolt.md
影响面 Tag：OP

📝 PR 规范检查

PR 标题不符合规范，缺少官方 [Tag] 前缀。当前标题使用了 emoji 和 "Bolt:" 前缀，不在官方 Tag 列表中。

标题建议（可直接复制）：

• [Optimization] Memoize module availability and device properties lookups

问题

级别	文件	概述
🟡 建议	.jules/bolt.md	Jules bot 元数据文件不建议提交到仓库

总体评价

变更逻辑正确且低风险。对无参函数 has_flashinfer() 添加 @cache、get_sm_version() 添加 @functools.lru_cache(maxsize=None) 均为等效的 memoization 方式，可有效避免热路径上重复的 importlib.util.find_spec 模块遍历和 paddle.device.cuda.get_device_properties() 硬件属性查询开销。建议移除 .jules/bolt.md bot 元数据文件，并修正 PR 标题格式。

[PaddlePaddle-bot]

🟡 建议 .jules/bolt.md 是 Jules bot 的元数据文件，不建议提交到项目仓库中，会引入与项目功能无关的文件。

建议将 .jules/ 目录添加到 .gitignore，或在此 PR 中移除该文件。