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参数化分块与宽度

将可调选项公开为参数

参数化分块与宽度 是 CoddyKit 上的免费 Mojo Academy 课时。这是第 2 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Mojo Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Mojo Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Knobs Must Be Parameters

To let autotuning vary a value, it has to be a compile-time parameter, not a plain runtime variable. Parameters can be specialized per candidate.

Tile Size as a Knob

A tile size controls how big a block of work you process at once. Make it a parameter and the tuner can try 16, 32, 64, and more.

fn process[tile: Int]():
    pass

Width as a Knob

SIMD width sets how many numbers you crunch per instruction. Different chips favor different widths, so expose it as a parameter too.

fn run[width: Int]():
    pass

Declaring the Parameters

Put tunable values inside the function's bracket list. Each entry becomes a knob the autotuner is allowed to change.

fn kernel[tile: Int, width: Int]():
    pass

Use Them Inside

Inside the body, treat the parameter like a constant. The compiler bakes its value in for each specialized version it builds.

fn step[tile: Int]() -> Int:
    return tile * 2

Sensible Ranges

Pick candidate values that make hardware sense: powers of two like 8, 16, 32 for width, and cache-friendly blocks for tile size.

Keep Knobs Independent

Each knob should mean one clear thing. Tangled parameters make the search confusing and the results hard to explain.

Validate with Constraints

Use a constraint to reject impossible combinations early, so the tuner never wastes time building candidates that cannot work.

constrained[width > 0]()

Defaults Still Help

Give each parameter a reasonable default. Code stays usable without tuning, and the search starts from a known-good baseline.

fn kernel[tile: Int = 32]():
    pass

More Knobs, Bigger Space

Every extra parameter multiplies the candidates to test. Expose the few knobs that truly matter, not every number you can find.

Now It Is Tunable

With tile and width as parameters, your kernel is ready: the autotuner has clear dials to turn while searching for peak throughput. 🔧

Quick Check

Confirm what makes a value tunable by the autotuner.

Recap

You exposed tile and width as compile-time parameters, added a constraint and defaults, and gave the autotuner clean dials to turn. 🎯

常见问题解答

「参数化分块与宽度」课时是免费的吗？

是的 — 「参数化分块与宽度」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Mojo Academy 课程的其余内容，请升级到 CoddyKit PRO。 Mojo Academy 课程共包含 4 节课。

「参数化分块与宽度」这节课中我会学到什么？

将可调选项公开为参数你通过在浏览器中直接运行的动手代码来练习 Mojo Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Mojo Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Mojo Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 2 节课，共 4 节。

「参数化分块与宽度」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Mojo Academy 课中编写并运行代码吗？

能。每节 Mojo Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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