http://www.bombich.com/mactips/swap.html
Then when/if the mac needs to go to virtual memory, it doesn't have to use the main (and perhaps fragmented) partition.
Robert Patterson wrote:
Great article. It brings up two points that I was mistakenly taking as given.
The first point is that your system must have plenty of RAM to spare for a RAM disk. Barring that, it is quite possible--even likely--you will see no performance improvement in Finale with a RAM disk. I have 512MB, of which (in OS9) I dedicate 64MB to a RAM disk. In OSX I might use less, but I'll bet OSX runs pretty smoothly even with just 448MB.
The second point is that the RAM disk has to bypass the OS's virtual memory management and stay in RAM all the time. In OS9 this is no problem. Finale works poorly with OS9 virtual memory anyway, so I leave vm off. In OSX this is apparently more difficult. But obviously, if the OS is swapping the RAM disk out to disk as if it were any other program, this will mitigate against the benefit of the RAM disk.
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