Path: utzoo!attcan!uunet!cs.utexas.edu!usc!rutgers!mcnc!rti!dg-rtp!chutney!eliot From: eliot@chutney.rtp.dg.com (Topher Eliot) Newsgroups: comp.unix.wizards Subject: Re: Reserving Space on Disk Message-ID: <1990Jul30.160523.29362@dg-rtp.dg.com> Date: 30 Jul 90 16:05:23 GMT References: <13422@ulysses.att.com> <836@mwtech.UUCP> <1990Jul17.032745.3807@eng.umd.edu> Sender: usenet@dg-rtp.dg.com (Usenet Administration) Reply-To: eliot@dg-rtp.dg.com Organization: Data General Corporation, Research Triangle Park, NC Lines: 14 |> Alternetly how about mmap? You can mmap a half a meg at a time, that ought |> to reduce the number of syscalls, only write once every 8K (or whatever |> the disk block size is) reducing the memmory bandwidth, but will this result |> in fewer context switches then write? Then writev? Well, it would avoid explicit context switches, but would undoubtedly involve some non-trivial number of page faults. Can anyone out there educate us on how many page faults could be expected? Topher Eliot Data General Corporation eliot@dg-rtp.dg.com 62 T. W. Alexander Drive {backbone}!mcnc!rti!dg-rtp!eliot Research Triangle Park, NC 27709 (919) 248-6371 Obviously, I speak for myself, not for DG.