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Re: how to test and compare performance of bullseye for i386 and amd64

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On Tue, Jan 25, 2022 at 03:29:17PM +0100, tomas@tuxteam.de wrote:
> On Tue, Jan 25, 2022 at 09:18:55AM -0500, Stefan Monnier wrote:
> > > it's surprising that "The x64 binary are also somewhat larger than the i386
> > > binaries"
> > 
> > There is no fundamental reason why a 64bit architecture (like amd64) would
> > require more code than a 32bit architecture (like x86), but yes, on the
> > average amd64 code is a bit larger than x86.
> 
> For one, pointers are bigger. For another, ints too. So perhaps, for
> plain, straight, silly compiled C code...

I just spent a whole bunch of time writing something similar, in response
to this... and then I figured out that Stefan simply made one poor word
choice that caused the message to be extremely confusing.

I believe that what Stefan meant here is that the amd64 binary has the
same number of *instructions*.  But as you say, the instructions may be
physically longer, due to having longer operands.

So yes, amd64 compiled code tends to take up more space.  Even if it's got
the same number of instructions (which may or may not be true in all cases
-- the increased number of registers, for example, may actually decrease
the number of instructions spent moving values in and out of memory).

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how to test and compare performance of bullseye for i386 and amd64 a <loushanguan2015@sina.com> - 2022-01-25 02:40 +0100
  Re: how to test and compare performance of bullseye for i386 and  amd64 David Wright <deblis@lionunicorn.co.uk> - 2022-01-25 04:10 +0100
    Re: how to test and compare performance of bullseye for i386 and  amd64 Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2022-01-25 05:00 +0100
      Re: how to test and compare performance of bullseye for i386 and  amd64 a <loushanguan2015@sina.com> - 2022-01-25 07:40 +0100
        Re: how to test and compare performance of bullseye for i386 and  amd64 <tomas@tuxteam.de> - 2022-01-25 15:40 +0100
          Re: how to test and compare performance of bullseye for i386 and  amd64 Greg Wooledge <greg@wooledge.org> - 2022-01-25 15:50 +0100
            Re: how to test and compare performance of bullseye for i386 and amd64 Stefan Monnier <monnier@iro.umontreal.ca> - 2022-01-25 19:00 +0100
          Re: how to test and compare performance of bullseye for i386 and amd64 Stefan Monnier <monnier@iro.umontreal.ca> - 2022-01-25 18:50 +0100
        Re: how to test and compare performance of bullseye for i386 and amd64 Stefan Monnier <monnier@iro.umontreal.ca> - 2022-01-25 15:40 +0100
        Re: how to test and compare performance of bullseye for i386 and  amd64 David Wright <deblis@lionunicorn.co.uk> - 2022-01-26 01:40 +0100
          Re: how to test and compare performance of bullseye for i386 and  amd64 Polyna-Maude Racicot-Summerside <debian@polynamaude.com> - 2022-01-26 11:50 +0100
            Re: how to test and compare performance of bullseye for i386 and  amd64 David Wright <deblis@lionunicorn.co.uk> - 2022-01-26 17:50 +0100
            Re: how to test and compare performance of bullseye for i386 and  amd64 a <loushanguan2015@sina.com> - 2022-01-26 23:10 +0100
            Re: how to test and compare performance of bullseye for i386 and  amd64 a <loushanguan2015@sina.com> - 2022-01-27 07:20 +0100
              Re: how to test and compare performance of bullseye for i386 and  amd64 a <loushanguan2015@sina.com> - 2022-01-27 11:00 +0100
  Re: how to test and compare performance of bullseye for i386 and  amd64 Andy Smith <andy@strugglers.net> - 2022-01-25 13:00 +0100
    Re: how to test and compare performance of bullseye for i386 and amd64 Stefan Monnier <monnier@iro.umontreal.ca> - 2022-01-25 15:40 +0100

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