On Jan 16, 2011, at 2:43 PM, Graham Cox wrote:

> Who complains about a 30MB memory usage increase these days? Who even 
> notices? This is not Mac OS 9, it doesn't matter what your app's memory 
> footprint is (within reason).

Two kinds of people:

1. Experienced users that watch Activity Monitor like a hawk.

2. Unexperienced users that blame your program for slowing down their computer 
once its memory usage spikes and forces the OS to start swapping. Not everyone 
is literate enough to understand swapping, and since the OS outside of Activity 
Monitor gives the user no indication that this is going on (unless the disk is 
nearly full), then they need a scapegoat.

Using available memory is normally a good thing, since loading things from disk 
takes longer than accessing them from memory. But it is a balancing game, 
because using too much memory has negative side effects. So yes, it does 
matter, especially in 64-bit applications, since at least 32-bit apps will 
crash if they go overboard.

Nick Zitzmann
<http://www.chronosnet.com/>



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