Very Computer

Hi,

Can someone please tell me how I can find out if aix 4.3.2 and above is
running in 32 bit mode or 64 bit mode. I found that /etc/inittab has an
entry to load 64, which tells me that it should me running at 64 bit but
'getconf  LONG_BIT ' returns 32.

Thanks

Sudhakar

The AIX kernel is 32-bit.  Yes, there are 64-bit RS/6000s, fast
ones.  And yes, you can run 64 bit (or 32-bit) applications on
that HW.  But AIX, even on the 64-bit HW has a 32-bit kernel.
Unless you turn on compile flags you will get a 32-bit binary if
you compile C code on AIX using IBM's C compiler.  This is true
on both 32-bit or 64-bit HW.  I hope this helps you.

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AIX 4.3.2 runs in 32-bit mode.  That's the only kind of kernel you
can get, even on 64-bit hardware.  There will be, however, 64-bit
processes on 64-bit hardware.

If you want the type information, longs and pointers are 64-bit
in 64-bit mode; ints are still 32-bit.  In 32-bit bit mode all
3 are 32-bits wide.

All the 64-bit configuration does is load a kernel extension that
provides the 64-bit system calls (amidst other stuff, of course :-)
Then you can run 64-bit apps.  But the underlying kernel is still
32-bit, albeit a smart 32-bit ;-)

--
Gary R. Hook / AIX Kernel Development, IBM / These opinions are _MINE_
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