From: earnie_boyd AT hotmail DOT com (Earnie Boyd) Subject: Re: Time and motion studies of gcc and egcs and LCC 5 Feb 1998 10:23:54 -0800 Message-ID: <19980205125003.7871.qmail.cygnus.gnu-win32@hotmail.com> Content-Type: text/plain To: gnu-win32 AT cygnus DOT com >Date: Wed, 4 Feb 1998 14:12:43 -0500 (EST) >From: ian AT cygnus DOT com >To: sam AT campbellsci DOT co DOT uk >CC: gnu-win32 AT cygnus DOT com >Subject: Re: Time and motion studies of gcc and egcs and LCC > >In gnu-win32 sam AT campbellsci DOT co DOT uk (Samuel James Liddicott) writes: > >>I read that in win95 the pages are flushed in order of first-in-first-out, >>and if a flushed page is a commonly used page, it will just be first-in >>again a bit quicker, and all this to save on the overheads of working out >>which pages are least used. > >>I was shocked when I read it too, but imagine the overheads of doing page >>usage sorting every time you need to load a new page? MS seemed to think >>little was gained. > >There are several other approaches. One technique is to have a daemon >which periodically marks pages as unreadable and unwritable. When >there is an exception on the page, the protection is removed, and the >page is moved to the end of usage list. This way the pages are very >roughly sorted by usage when it comes time to discard a page. > >Discarding pages in strict FIFO order seems to me like a recipe for >thrashing. Now I know why my disk drive goes crazy when I exit a program and something else takes the active window. Thrash, thrash, thrash ... > >Ian >- - \\||// ---o0O0--Earnie--0O0o---- -earnie_boyd AT hotmail DOT com- ------ooo0O--O0ooo------- Check out these great gnu-win32 related sites: ftp://ftp.cygnus.com/pub/gnu-win32/latest/ (ftp site) http://www.cygnus.com/pubs/gnupro/ (Comercial Page) http://www.cygnus.com/misc/gnu-win32/ (Project Page) http://www.cygnus.com/ml/gnu-win32 (Mail Archives) http://www.itribe.net/virtunix/winhelp-man-pages/ (HTML Man Pages) http://www.lexa.ru/sos (Sergey Okhapkin) ftp://www.lexa.ru/pub/domestic/sos/ (Sergey's ftp site) http://www.fu.is.saga-u.ac.jp/~colin/gcc.html (Colin Peters) http://www.xraylith.wisc.edu/~khan/software/gnu-win32/ (Mumit Khan) http://gnu-win32.paranoia.ru (Chuck Bogorad's ports) ftp://ftp.deninc.com/pub (Den Internet Services - US mirror and ports) http://www.bestweb.net/~aka/gnu-win32/ (GNU-Win32 Bash Configuration) http://rcw.home.ml.org/ (Rob Warner - software ports) ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com - For help on using this list (especially unsubscribing), send a message to "gnu-win32-request AT cygnus DOT com" with one line of text: "help".