Using tmpfs + a very large swap partition for /tmp instead of a regular filesystem?

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http://serverfault.com – I have Linux server and I have a spare 500GB disk partition. I wanted to format it and use it for /tmp. The server occasionally runs some large data processing tasks so it can happen that /tmp will hold GBs of temporary data. Then I got an idea that instead I could add it as a swap partition instead and mount /tmp to tmpfs. Is this idea reasonable? The server has 6GB of RAM, so in most cases data on /tmp would be only in RAM, with the obvious speed advantage. The question is, what if there will be let's say 10-20GB of data on /tmp, how will the system perform? What would be the performance c (HowTos)