Article View: comp.sys.sun
Article #11165Re: sticky bit
From: Peter Baer Galvin
Date: Tue, 28 Feb 1989 11:46
Date: Tue, 28 Feb 1989 11:46
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1641 bytes
Under Berkeley Unix an executable program is copied into system swap space before execution is started. Paging of the program is done from swap space rather than from the executable in the file system because (according to Karels I think) going through the file system would take 3 times longer. When the last processes using the image exits, the image is removed from swap. The sticky bit tells the OS not to delete the image in swap space, even if no processes are using that image. This saves the overhead of the copy from file system to swap space. The down side is that the swap space is then not usable by other programs until the system in question reboots. If you always have an emacs running (as I do) then setting it sticky doesn't do much, one way or the other. --Peter Peter Baer Galvin (203)432-1254 Senior Systems Programmer, Yale Univ. C.S. galvin-peter@cs.yale.edu 51 Prospect St, P.O.Box 2158, Yale Station ucbvax!decvax!yale!galvin-peter New Haven, Ct 06457 galvin-peter@yalecs.bitnet
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!rice!sun-spots-request From: galvin-peter@yale-bulldog.arpa (Peter Baer Galvin) Newsgroups: comp.sys.sun Subject: Re: sticky bit Message-ID: <50864@yale-celray.yale.UUCP> Date: 28 Feb 89 11:46:54 GMT References: <8902081253.AA06789@ursa-major.SPDCC.COM> Sender: usenet@rice.edu Organization: Yale University Computer Science Dept, New Haven CT 06520-2158 Lines: 18 Approved: Sun-Spots@rice.edu Original-Date: 16 Feb 89 16:29:51 GMT X-Sun-Spots-Digest: Volume 7, Issue 172, message 3 of 15