Manually allocating RAM to applications, how?

Hi there friends,
I am looking to know how to manually change de default RAM allocated (automatically, right?) to a program.
Basically, I'm using a memory demanding application, and it could always do the job within about 512mb of RAM. The thing is, I have other program, whichs doesn't require alot, but use up a big part of my RAM. (BTW, I have 1gb of RAM, only)
I could easily afford having my other program cached on disk, while the memory demanding one has all the speed from the RAM.
I've readed a lot from other pages (a little "allocating RAM mac" googling), and it has all shown me how to change the default RAM allocated to applications, but only for Classic..
Even if OS X has it's own automated memory management, I'd like to give it a try, if it possible, of course.
Great thanks to anyone who could give me a hand!

You can not do this. And if you could, there is no way you could manually improve on the system's memory management. In fact there isn't really a "default" allocation. Memory is allocated dynamically, as needed. An active process always gets priority on RAM. If your "other" application is cached on disk, then it is not active. It must be swapped back into RAM before it can become active. And vice versa. If it is using RAM while inactive, an active process that needs the RAM will get it. The system does what needs to be done automatically.

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