Am 01.06.2012 18:01, schrieb Chris Adams: > Once upon a time, Reindl Harald <h.rei...@thelounge.net> said: >> DO NOT SPIT USELESS DATA IN MY RAM PER DEFAULT BECAUSE RAM >> IS EXPENSIVE STORAGE AND USED FOR BETTER THINGS > > Actually, the data written to /tmp _always_ goes through the page cache > and is held in RAM (at least for a bit). Since many things in /tmp are > short-lived, they'll stay in the page cache for "life". The difference > between /tmp-on-storage and /tmp-on-tmpfs is that tmpfs has no overhead > for reading metadata from storage, allocating space, flushing updated > metadata, etc.; the files just only exist in the same page cache they > would have been in all along
but the data in /tmp are not forever in the cache if it is tmpf and app dies after creating a 2 GB file in /tmp RAM will be filled until next reboot and leads sooner or later in swap-usage or OOM-killer no, you do NOT want swap-usage in most workloads at all
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