[Share code] Get available memory

lukaskollmer

Recently, the question came up how to get memory statistics.
I found an Objective-C example on StackOverflow and rewrote it using ctypes.

My gist: https://gist.github.com/lukaskollmer/a09c0278d2d224b9f4839a895ebb9988

Notes:

There are 2 different total memory counts: "total" and "total (according to Cocoa)"
Because the graphics card and the CPU share the same memory, the GPU us actually using a part of the RAM for it's graphics memory
That's why the first total count is smaller. It's only the amount of memory available to the CPU, while the second total count contains both

Example:

chibill

Very cool this can be expanded to also show the processor count. With only one new line of code.

lukaskollmer

@chibill I know. You can use

NSProcessInfo.processInfo().activeProcessorCount()

Phuket2

Yes it's a balancing act. When do you stop. Is my biggest problem just in Python.

brumm

Great, thanks a lot. Btw. whats your max. free memory? I got values from 50MB to 300MB. After rebooting my iPad Air 1 e.g. I got 138MB...

lukaskollmer

@brumm I made some tests:

Normal usage

free memory: 190MB
used memory: 745MB

After cold reboot

free memory: 170MB
used memory: 950MB

After warm reboot

free memory: 200MB
used memory: 920MB

brumm

Okay, now I'm sure that I have too less memory 😞 (even if I get 522MB)

open shp+dbf ('free: ', <__NSCFString: 522,1 MB>)
shp+dbf readed ('free: ', <NSTaggedPointerString: 8,8 MB>)
then crash while writing it in a sqlite db

Trying to convert 80MB of data... with pyshp.

Phuket2

Guys, I have two comments. They are not directed at this post, more to share posts generally.

I think a nice idea if you share code, you put at least your forum user name in the top of the file. Often I copy share code here , then some weeks later use it. Like to credit the person that shared it. Yes, I can go and copy the name in myself, but I sometimes forget too.
Rather than writing results to the console, wouldn't it be better to show them using the dialogs module. It's easy, we can all do it. For a few extra minutes, gives it a lot more professional look.

Look, only suggestions. It's great people share code. Not trying to burden them with extra work. But it's amazing how much things are valued with a little bit of polish.

I haven't followed this way before. But I will try too. Also I will attempt to make it Pass pep8 and pyflakes

Phuket2

This post is deleted!

Phuket2

Thanks to all for not causing me further embarrassment on my stupid rant. I have deleted now. Oh well.....

jmv38

This works great to get total memory. Anyone knows how to get memory used by pythonista only? Thanks.

JonB

https://github.com/jsbain/objc_hacks/blob/master/memstatus.py

the virtual_size field shows the amount of memory used by pythonista .

wolf71

@JonB The Result :
{'system_time': 1.0, 'resident_size': 3041012939227142L, 'policy': 0, 'virtual_size': 551690955866505216L, 'suspend_count': 0, 'user_time': 0.0}

How calc the Pythonista using memory? (just like 320.23MBytes) the virtual_size very large.
How to get Pythonista CPU loading and Total CPU loading ?

JonB

Looks like this code does not work properly on 64 bit... i suspect the structure is not sized correctly..