Scala集合内存占用特征 [英] Scala collection memory footprint characteristics

问题描述

有一个关于 性能特征的方便页面类.是否有类似的内存占用数据?

There is a handy page about performance characteristics of the Scala collection classes. Is there similar data on memory footprint?

我有一种情况，我担心内存使用，并希望在我选择要使用的集合时考虑到这一点.例如，在 Array[Array[T]] 和 Vector[Vector[T]] 之间.

I have a situation where I'm concerned about memory use and would like to factor this in my choice of collection to use. For instance, between Array[Array[T]] and Vector[Vector[T]].

推荐答案

这是我在 2.9.0 上用 1,000,000 个对象填充这些各自的不可变序列后发现的结果.我让它们都指向同一个对象，以计算出内容的大小.

Here is what I've found out by filling up those respective immutable sequences with 1,000,000 objects on 2.9.0. I had them all point to the same object to factor out the size of the content.

• Array:1x (32 位基线 4,000,016 字节；64 位基线 8,000,024)
• 矢量:1.17x
• List、Queue、Stack:4x
• 评估 Stream:10x

• Array: 1x (baseline 4,000,016 bytes on 32 bits; 8,000,024 on 64 bits)
• Vector: 1.17x
• List, Queue, Stack: 4x
• evaluated Stream: 10x

System.gc 被调用，然后触发堆转储，然后在 Eclipse MAT 中打开.

System.gc was called then triggered heap dump then opened in Eclipse MAT.

基于那个 Array 和 Vector 是非常封闭的.

Based on that Array and Vector are pretty closed.

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