Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!unix.cis.pitt.edu!pitt!vax.cs.pitt.edu!jonathan From: jonathan@cs.pitt.edu (Jonathan Eunice) Newsgroups: comp.benchmarks Subject: Re: Measuring disk read times for Unix Message-ID: Date: 19 Mar 91 13:46:06 GMT References: <714@opus.NMSU.Edu> <1991Feb27.233049.2972@intellistor.com> Sender: news@pitt.UUCP Distribution: comp Organization: University of Pittsburgh Computer Science Lines: 10 Chuck.Phillips@FtCollins.NCR.COM writes: SVr4 and SunOS use a lazy pageout method; a file mapped into memory is mapped out (LRU) only if there is a request for more memory _and_ there is no unallocated RAM (and umounts, of course). Theoretically, a system with lots of excess RAM may leave a a file paged into RAM indefinitely. I suspect the same is true of OSF/1. Anyone in the know care to comment? I believe this is true of: SunOS 4.x, SVr4, OSF/1, and AIX 3.1.