Using iStat Menus I can watch how my system memory (16 GB on MBP retina) is used. When I boot up I have about 15% usage. Running Aperture alone to get maximum benefit of my memory, I watch the percentage rise over time. When it get to about 80% and above I usually quit Aperture to avoid hangs and other problems (past experience). That drops memory usage down to maybe 30-40%, but never down to the low level at startup.
I understand this is RAM holding stuff in memory, and only a reboot lets me get it all back.
My question concerns Aperture's use of memory. Is that build up to an eventual 80-90% usage normal? Is there anything that can reduce the usage, or at least the rate of consumption? For example, face recognition? Anything else? Is this gobbling up of memory usage related to “memory leak” or is that something totally different?
I suppose I could/should ask this on Apple's forums, but as it really is only an issue when I use Aperture I thought I would ask for your experiences and expertise.