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- Path: sparky!uunet!munnari.oz.au!sol.deakin.OZ.AU!rand!cocamrd.mel.cocam.oz.au!pjd
- From: pjd@cocamrd.mel.cocam.oz.au (Pat Dooley)
- Newsgroups: comp.arch
- Subject: Re: 64 bit Alpha AXP -vs- 32 bit computers
- Message-ID: <1590@rand.mel.cocam.oz.au>
- Date: 19 Nov 92 23:54:22 GMT
- References: <1992Nov17.162014.6506@chpc.utexas.edu>
- Sender: usenet@rand.mel.cocam.oz.au
- Organization: Co-Cam Computer Group, Oz
- Lines: 54
-
- In article <1992Nov17.162014.6506@chpc.utexas.edu> kneuper@chpc.utexas.edu (Stephen Kneuper) writes:
- >A debate is occuring at my site (and within my mind) regarding 64 bit
- >versus 32 bit computing.
- >
- >I'm trying to figure out why I want to go to a 64 bit machine Alpha
- >AXP system instead of continuing to run 32 bit machines (RS6K, Sun).
- >
- >Outside of the numerical analysis issues, the only other issues I see
- >are:
- >
- >1. 64 bit ints allow the easy support of files larger than 2 Gbytes.
- >
- >2. 64 bit ints allow the construction of filesystems larger than 2
- >Gbytes.
- >
- >I do know some vendors (convex) have addressed these issues within a
- >32 bit architecture; Sun allows >2GB filesystems, if memory serves.
- >Have I missed any other obvious (or not!) programming or system
- >administration issues?
- >
- >--
- >Steve Kneuper kneuper@chpc.utexas.edu - Internet
- >Sr. Operating Systems Specialist
- >University of Texas System (mailcode 78700) kneuper@uthermes - BITNET
- >Center for High Performance Computing (512)471-2472
-
- Commercial computing is moving beyond structured data. Database
- systems holding BLOBS, such as images, voice, video clips,
- need much more that 2GB file systems. We already have problems
- with databases hitting 2GB file limits even before we start
- storing unstructured data.
-
- You don't need a 64-bit machine to support a 64-bit file system,
- but it helps. Remember the days when we had to program around
- 16-bit limitations. Well, those days will return in the 1990s
- as we program around 32-bit limits and lash together 32-bit
- segments to stretch out address spaces past 4GB.
-
- A 64-bit architecture should be real good for CHESS programs.
- The whole board can be represented using 64 words or less. A
- few ands, ors and xors and you can generate the set of possible
- moves from a particular position.
-
- 64-bits should also be good for financial applications. No need
- for micro-coded or milli-coded packed decimal to manipulate
- dollar amounts.
-
- Need 64-bits today? Probably not. Need them by 1995 to run 1995
- applications? Quite likely. Need a 64-bit PC? Probably by 2001
- if you want VR, Voice Recognition, Fully digital Video, etc. etc.
-
- I'm sure other people can up with lots of useful ways to exploit
- 64-bit address spaces and the speed of single cycle 64-bit
- integer and logical operations.
-