Re: Function Memory Usage

[Terry Reedy]

Paulo J. Matos wrote:

Hi all,
>
What's the best way to know the amount of memory allocated by a
function

What do you count?

def zeros(n): return [0]*n

how much memory is that?

[Steven D'Aprano]

Re: Function Memory Usage

On Sat, 01 Nov 2008 01:43:44 -0400, Terry Reedy wrote:

Paulo J. Matos wrote:

>Hi all,
>>
>What's the best way to know the amount of memory allocated by a
>function

>
What do you count?
>
def zeros(n): return [0]*n
>
how much memory is that?

I assume you don't include the memory required by the function itself.

Integers take 20 bytes, but rounded to the nearest multiple of 8 bytes,
so 24 bytes. However, we can assume that the 0 int is cached, so we only
need 24 bytes for all n of them.

Lists have a fixed overhead of 28 bytes, plus 4*n for the items, again
rounded to the nearest multiple of 8 bytes.

Add them together, and you have the memory usage of the list returned.


--
Steven