[csw-maintainers] 32bit vs 64bit
Joerg.Schilling at fokus.fraunhofer.de
Wed Jul 20 10:33:51 CEST 2011
Ben Walton <bwalton at opencsw.org> wrote:
> Is it time to flip this default to on? Some apps would benefit, as
> you noted. Others wouldn't, but if those don't use isaexec, the
> 32-bit would still be the default.
Most applications on sparc do not get a benefit from 64 bit as sparc is an
orthogonal CPU and you have to pay for 64 bit with bigger code.
Many applications in x86 benefit from 64 bit as they get twice as many
registers with 64 bits and as missing registers is one of the major design
faults from Intel.
There is another more interesting thing to discuss. The large file summit in
1995 did bring us 32 bit support for files > 2147483646 bytes but the standard
commitee did forget about adding support for the time past 2038 Jan 19 03:14:07.
Sooner or later all applications that have to deal with times will have to be
converted to 64 bit only and many of them are still not well written for the
I had to work a lot on e.g. SCCS in order to remove any time related
limitations. In order to support the time range for SCCS mentioned in POSIX
with a 32 bit application, I added code that folds the time between
2038 Jan 19 03:14:08 GMT and Y2068 to times between 1902 and 1932.
EMail:joerg at schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
js at cs.tu-berlin.de (uni)
joerg.schilling at fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/private/ ftp://ftp.berlios.de/pub/schily
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