Agreed on the swap front. If a runaway process has a huge amount of swap space to eat through before dying, it can bring the system to a halt for an extended length of time. Trying to ssh in (if I don't already have an open connection), and then battling for enough memory and disk IO just to run the kill/killall command, is often impossible. So I tend to set a tiny swap, just for stuff that really doesn't need to be in memory, like 128meg or something. Now a runaway process won't cause a runaway system.
Not that it's a regular occurance, but with todays amounts of memory, this "1.5 x RAM" swap rule that people won't let go of, causes more harm than good.
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