How to determine memory requirements?

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iprice

Now for a really dumb question - which is the actual memory usage of a game+OS and all other running apps? I've never worried before as most of my games have been very small, but I'm now making a game that has lots of media assets.

There are loads of different values in four headings
Totals
Commit Charge
Physical Memory
Kernal Memory

There's also a PF Usage value.

Which set should we/I be looking at?