EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  <20052006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  <20052006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>

Subject: Re: 64-bit EPICS anyone?
From: "Ernest L. Williams Jr." <[email protected]>
To: [email protected]
Cc: EPICS tech-talk <[email protected]>
Date: Sat, 15 Oct 2005 08:03:54 -0400
On Fri, 2005-10-14 at 15:16 -0400, Zhijian Yin (ZY) wrote:
> Ernest L. Williams Jr. wrote:
> 
> >Compilation worked very well and was extremely fast, however, it is not
> >64-bit.  When the compilation is complete what you get is a 32-bit
> >application running on a 64-bit OS.  So basically, when we run EPICS it
> >the linux OS is in 32-bit compatibility mode.
> >
> >To achieve the 64-bit mode we will have to throw the "-m64" flag to the
> >GCC compiler.
> >
> >This is my next step but I sense there will be trouble as some of my
> >colleagues have forewarned me.
> >  
> >
> Thanks for clear this up. 
> 
> However, the binary I got, for example, 'file medm' shows
> 
> medm: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for 
> GNU/Linux 2.6.0, dynamically linked (uses shared libs), not stripped
> 
> How can it be a 32-bit application?
> 
> Just start to play x86_64 linux, sorry for the "rudimentary" question.
You are right. Your application is indeed 64 bit.
For GCC it turns out that when compiling on a 64-bit machine the default
is 64 bits.  
=========================================================================
On my machine 'file excas' shows:
excas: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for
GNU/Linux 2.4.0, dynamically linked (uses shared libs), not stripped
=========================================================================

Looks like we have to do something extra to get 32-bits.
For example, gcc -m32 and/or  g++ -m32

So EPICS BASE is really running in 64-bit mode, wow that was easy.
I hope something is not broken at run time.

excas: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for
GNU/Linux 2.4.0, dynamically linked (uses shared libs), not stripped

Thanks,
Ernest L. Williams Jr.
SNS Control Systems Group
ORNL

> 
> 
> ZY


Replies:
Re: 64-bit EPICS anyone? Steven Hartman
References:
64-bit EPICS anyone? Ernest L. Williams Jr.
Re: 64-bit EPICS anyone? Zhijian Yin (ZY)
Re: 64-bit EPICS anyone? Ernest L. Williams Jr.
Re: 64-bit EPICS anyone? Zhijian Yin (ZY)

Navigate by Date:
Prev: Re: 64-bit EPICS anyone? Zhijian Yin (ZY)
Next: Capfast symbol for R3.13 scan record Peregrine McGehee
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  <20052006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: Re: 64-bit EPICS anyone? Zhijian Yin (ZY)
Next: Re: 64-bit EPICS anyone? Steven Hartman
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  <20052006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
ANJ, 02 Sep 2010 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·