Article View: comp.sys.mac
Article #33275Re: Speed of the Next disk, what kind of network?
From: Jeff Siegal
Date: Sat, 15 Oct 1988 16:31
Date: Sat, 15 Oct 1988 16:31
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1437 bytes
In article <5632@hoptoad.uucp> tim@hoptoad.UUCP (Tim Maroney) writes: >It seems to me that with 8 Megs standard main memory, [...] >just cache the entire file in RAM [...] It is important to note that Mach does this automatically. The Mach group claims a significant reduction in I/O operations over 4.3 BSD when "compiling a subset of programs in /bin" >On thge other hand, page fault handling seems destined to be slow, unless the >head spends all its idle time in the page swapping area automatically. Mach doesn't have a designated swapping area like Unix does. It just swaps directly to the user filesystem (taking blocks away only when needed). An interesting question is what strategy it uses to select blocks (i.e. layout) for this purpose. Anyway, as others have already pointed out, it probably isn't going to page much with 8MB standard memory. Jeff Siegal
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!mit-eddie!fenchurch.mit.edu!jbs From: jbs@fenchurch.MIT.EDU (Jeff Siegal) Newsgroups: comp.sys.mac,alt.next Subject: Re: Speed of the Next disk, what kind of network? Message-ID: <10284@eddie.MIT.EDU> Date: 15 Oct 88 16:31:02 GMT References: <4XJKg9y00UgX0BFFR=@andrew.cmu.edu> <5632@hoptoad.uucp> Sender: uucp@eddie.MIT.EDU Reply-To: jbs@fenchurch.MIT.EDU (Jeff Siegal) Organization: MIT EE/CS Computer Facilities, Cambridge, MA Lines: 20