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Re: 32 bit VS 64 bit modes

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Jason Damisch <jasondamisch@yahoo.com> writes:
>I admit not being the most adroit computer programmer or user
>in the world.  So, I thought that I'd ask, if people don't mind
>too much, what the various trade-offs and advantages are between
>32 bit and 64 bit modes.  For 16 bit VS 32 bit the advantages
>are obvious.  But, it seems to me that 32 VS 64 has diminishing
>returns.  Maybe 40 bit would be ideal?  What reasons could there
>possibly be for having more than 4 GB of RAM?

For having more?  Because you can afford it.  I recently bought a
cheap CPU, motherboard, cooler, and RAM.  I had to decide whether to
buy 4GB for something like EUR20 or 8GB for EUR30 to go with the EUR30
CPU and the EUR 46 mainboard.  I decided to buy 8GB.  And sizes are
growing over time: Moore's law in action.

For using more?  For some applications, you don't need more, for
others, using more helps.  E.g. the game Runes of Magic is a 32-bit
program that crashes if the RAM usage goes above about 1.6GB, even on
a machine with 16GB.  If it was a 64-bit application, these crashes
probably would not happen.  In-Memory databases are a big topic these
days, and they often use more than 4GB.  Or, in the Forth world I used
more than 4GB for something quite a while ago (IIRC it was
<https://www.complang.tuwien.ac.at/forth/programs/sbpcp.fs>).

One can also benefit from having larger integers.  Also dependent on
the application.

Finally, in the case of AMD64 and Aarch64, the 64-bit architectures
provide additional benefits, in particular, more registers than the
32-bit architecture.  That was the main point of my original posting:
Gforth uses the additional registers on Aarch64 for better stack
caching, i.e., faster execution.

- anton
-- 
M. Anton Ertl  http://www.complang.tuwien.ac.at/anton/home.html
comp.lang.forth FAQs: http://www.complang.tuwien.ac.at/forth/faq/toc.html
     New standard: http://www.forth200x.org/forth200x.html
   EuroForth 2016: http://www.euroforth.org/ef16/

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32 bit VS 64 bit modes Jason Damisch <jasondamisch@yahoo.com> - 2016-05-27 11:21 -0700
  Re: 32 bit VS 64 bit modes Paul Rubin <no.email@nospam.invalid> - 2016-05-27 13:06 -0700
    Re: 32 bit VS 64 bit modes Jason Damisch <jasondamisch@yahoo.com> - 2016-05-27 13:22 -0700
      Re: 32 bit VS 64 bit modes hughaguilar96@gmail.com - 2016-05-27 13:59 -0700
  Re: 32 bit VS 64 bit modes anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-05-28 10:07 +0000
    Re: 32 bit VS 64 bit modes Paul Rubin <no.email@nospam.invalid> - 2016-05-28 19:09 -0700
      Re: 32 bit VS 64 bit modes Paul Rubin <no.email@nospam.invalid> - 2016-05-28 20:00 -0700
      Re: 32 bit VS 64 bit modes Albert van der Horst <albert@cherry.spenarnc.xs4all.nl> - 2016-05-29 17:46 +0000
        Re: 32 bit VS 64 bit modes Paul Rubin <no.email@nospam.invalid> - 2016-05-29 11:27 -0700
  Re: 32 bit VS 64 bit modes Rod Pemberton <NoHaveNotOne@bcczxcfre.cmm> - 2016-05-28 23:42 -0400

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