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Some experiments (ATLAS as a for instance) have decided to simply
upgrade their SBCs to 64 bit capable rather than suffer through the
various problems associated with trying to hang on to the old hardware.
 We saw issues beyond just 32 bit vs. 64 bit.  The older systems were
many generations back in terms of capability which caused numerous hard
to diagnose problems.  In our case the pentium4 default broke some code
since the SBCs we had were pentium3 only.  Most things worked but a few
applications simply crashed.  The cost of upgrading was lower than the
human cost of finding and fixing this sort of thing.

On 12/18/2014 02:59 PM, Ian Murray wrote:
> On 18/12/14 20:16, Konstantin Olchanski wrote:
>> On Mon, Dec 15, 2014 at 04:51:19PM -0800, Keith Lofstrom wrote:
>>> Again - the reason for 32 bit is not that I cherish old CPUs ...
>>> And that is why I ask here; if anybody runs old machines for
>>> compatibility reasons, it would be experimental scientists ...
>>>
>> On target you are.
>>
>> Us experimental scientists have embedded computers (VME form factor)
>> with 32-bit CPUs and 0.5GB/1GB RAM. We run 32-bit SL4, SL5 and SL6
>> on them today and I expect we will still be using these machines
>> when SL6 becomes obsolete in 1-2-3 years. By then, I fully expect a 32-bit
>> port of SL7/CentOS7 to become available, somehow.
> Some talk of it here, with people having a first pass at it:-
> 
> http://www.karan.org/blog/2013/12/15/where-is-the-i686-in-rhel-7/
> 
> 
>>
>> But for today, I have not even digested the 64-bit SL7 yet, 32-bit SL7
>> is not even on the wish list yet.
>>
>> Now, the ARM SL7 is a different matter. *that* I want yesterday.
>>
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