"Martin v. L?wis" firstname.lastname@example.org wrote:
Evan Jones wrote:
Some posts to various lists  have stated that this is not a real problem because virtual memory takes care of it. This is fair if you are talking about a couple megabytes. In my case, I'm talking about ~700 MB of wasted RAM, which is a problem.
This is not true. The RAM is not wasted. As you explain later, the pages will be swapped out to swap space, making the RAM available again for other tasks.
First, this is wasting space which could be used for disk cache, which would improve the performance of my system.
And indeed, this is what the operating system does for you: free the memory (by swapping it out), then using the memory for disk cache, thus improving performance of your system.
Your statements above assume that swapping is OK but that's not necessarily true. Some of our daemons run on systems with no swap or extremely slow swap. Either way it's bad if the system has to swap out 50-100 MBs of "unused" memory. Now, that's a waste.