找出Python中某个对象正在使用多少内存 [英] Find out how much memory is being used by an object in Python

问题描述

您将如何查找对象正在使用多少内存?我知道有可能找出一块代码，而不是实例化对象(在其生命中的任何时候)要使用多少，这就是我想要的.

How would you go about finding out how much memory is being used by an object? I know it is possible to find out how much is used by a block of code, but not by an instantiated object (anytime during its life), which is what I want.

推荐答案

没有简单的方法来找出python对象的内存大小.您可能会发现的问题之一是Python对象(例如列表和字典)可能引用了其他python对象(在这种情况下，您的大小是多少?包含每个对象的大小的大小?).存在一些与对象类型和垃圾回收相关的指针开销和内部结构.最后，某些python对象具有非显而易见的行为.例如，大多数情况下，列表为更多的对象保留了空间. dict甚至更加复杂，因为它们可以以不同的方式进行操作(对于少量的键，它们具有不同的实现方式，有时它们会过度分配条目).

There's no easy way to find out the memory size of a python object. One of the problems you may find is that Python objects - like lists and dicts - may have references to other python objects (in this case, what would your size be? The size containing the size of each object or not?). There are some pointers overhead and internal structures related to object types and garbage collection. Finally, some python objects have non-obvious behaviors. For instance, lists reserve space for more objects than they have, most of the time; dicts are even more complicated since they can operate in different ways (they have a different implementation for small number of keys and sometimes they over allocate entries).

有一个一大段代码(还有一个

There is a big chunk of code (and an updated big chunk of code) out there to try to best approximate the size of a python object in memory.

您可能还想查看一些有关PyObject的旧描述(代表几乎所有python对象的内部C结构).

You may also want to check some old description about PyObject (the internal C struct that represents virtually all python objects).

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