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Marc A. Pelletier:
You can use /tmp, which is a memory filesystem for exactly this reason. (But only on Solaris systems, not Linux, so you probably want to use willow.)
Wait, why isn't your /tmp be mounted with tmpfs? (Hm. Debian/Ubuntu only mount /var/run on tmpfs by default; that might be it). No reason for it not to be, really.
/tmp is tmpfs on Solaris because it's the default on that platform. It's not on Linux because it's not the default there (at least not on Debian). Since we haven't observed that file i/o on /tmp contributes to any kind of performance issue, it was not worth the trouble to change it.
- river.