Agreed, we can't resize shared memory, but I don't think most OS's swap out shared memory, and even if they do, they usually have a kernel configuration parameter to lock it into kernel memory. All the old unixes locked the shared memory into kernel address space and in fact this is why many of them required a kernel recompile to increase shared memory. I hope the ones that have pagable shared memory have a way to prevent it --- at least FreeBSD does, not sure about Linux.
I'm pretty sure at least Linux, Solaris, and HPUX all work this way -- otherwise Oracle would have the same problem with their SGA, which is kept in shared memory.
Joe
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