用-hy-GHC堆分析-什么是*(星号)? [英] GHC heap profiling with -hy - What is * (star)?

问题描述

当我使用-hy标志来分析程序的堆使用情况时，

When I profile my program's heap usage with -hy flag like

./prog +RTS -hy

我经常在结果中看到构造函数*以及其他构造函数，例如[]和Word8.

I often see the constructor * in the results, along with other constructors such as [] and Word8.

在这种情况下，*是什么类型?与kinds有关吗?

What is the type * in this context? Is it related to kinds?

推荐答案

引自现实世界中的Haskell :

还有一些未知类型的堆分配数据(表示为"*"类型的数据).

There's also some heap allocated data of unknown type (represented as data of type "*").

并在 GHC用户指南中:

对于具有函数类型或未知/多态类型的闭包，字符串将代表实际类型的近似值.

For closures which have function type or unknown/polymorphic type, the string will represent an approximation to the actual type.

因此，这基本上意味着配置文件没有足够的信息来告诉它是什么类型.

So, it means basically that the profiling doesn't have enough information to tell what type it is.

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