Force allocating real memory

Question

Is it possible to allocate big chunk (512Mb-1Gb with 4Gb installed) of real memory without dropping it to swap?

My final intention is to free system memory: os x has a p

Answer 1

The mlock function will lock pages into physical memory. I'm not sure what the limits are.

You should be extremely sure you really want to do this. It's not a nice thing to do to the rest of the system.