找出操作需要多少内存

Question

How would I figure out how much memory an operation takes? For example:

memory_start = memory()
reader = csv.reader(file)
memory_end = memory()
memory_of_reader = math.abs(memory_end - memory_start)

Answer 1

If you want to get the size of an object you can use sys.getsizeof that return the size of an object in bytes.

sys.getsizeof(object[, default])

Return the size of an object in bytes. The object can be any type of object. All built-in objects will return correct results, but this does not have to hold true for third-party extensions as it is implementation specific.

If given, default will be returned if the object does not provide means to retrieve the size. Otherwise a TypeError will be raised.

getsizeof() calls the object's __sizeof__ method and adds an additional garbage collector overhead if the object is managed by the garbage collector.

example :

>>> import sys
>>> a=2
>>> sys.getsizeof(a)
24
>>> a='this is a test'
>>> sys.getsizeof(a)
51

And for more advanced tasks you can use memory_profiler that is a module for monitoring memory usage of a python program