> MVS of old had PAGE & SWAP. I think I've seen both page and swap > mentioned in vmstat man pages (or some such). Do both exist in > Unix? I've always assumed Unix swap was more like MVS page, LRU > scheme, but I know what ASSUME means.
Linux uses a demand page regime - and has for as long as I have been using it. The name of the SWAP partition(s) is an unfortunate artefact of the time (long passed) when it did in fact receive swapped out address spaces. I have a feeling Unix system V was also originally a (address space) swap based regime, but I doubt any *nix is these days. The usual Linux metrics (minimal as they are) use terms like "swap [in|out] count", but they are really page (slot) counts. This only applies to "dirty" annonymous pages - think (updated) getmained storage. There are also page-in/page-out counts, but they are unrelated to the SWAP partition/file. Don't bother looking for page files ... I think swap counts contribute to page counts, but the reverse is certainly not the case. Aren't you glad you asked. Shane ... ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
