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tmpfs questions

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http://forums.fedoraforum.org – I'm going to be putting Fedora 18 on a desktop w/ 32GB of memory. One of many things it will be used for is building packages. What I'm kind of thinking of doing is setting up a tmpfs filesystem with 10GB of capacity for mock so that very little disk IO is needed for building packages. My understanding is that the way tmpfs works is different than a traditional ram disk. With a traditional ram disk, allocating ram to disk means it isn't available to the system even when it isn't being used (disk is empty) My understanding is that with tmpfs - the memory isn't allocated for the file (HowTos)