32bit vs 64bit Linux

[Lisa Kachold]

Eric,

On Fri, May 31, 2013 at 1:40 PM, Eric Shubert <ejs at shubes.net> wrote:

> On 05/31/2013 09:28 AM, keith smith wrote:
>
>>
>> Hi,
>>
>> Even though I have 64bit hardware I always install the 32bit version of
>> Linux.  I do so because of the past discussions on this list that made
>> me believe the 32bit OS was better because 64bit caching is actually
>> slower due to the requirement that the cache be filled to a certain
>> point before it is moved.  I think I recall something about the amount
>> of RAM having some effect here also.
>>
>> Using a 32bit version over a 64bit version seems counter intuitive,
>> however that is what I have taken away from these conversations about
>> 32bit vs 64bit Linux.
>>
>> I'm using CentOS 6.x on a LAMP server that gets a low amount of
>> traffic.   However I may make the jump to Linux on my desktop this
>> summer. (this will be my 3rd attempt to become M$ free except one VM so
>> I can use IE for testing) I think all of my hardware is 64bit.
>>
>> So that begs the question, is 32bit better than 64bit or do I not
>> understand the issue?
>>
>> Thank you for your feedback.
>>
>> Keith
>>
>> ------------------------
>> Keith Smith
>>
>>
>>
>>
> Rule of thumb for servers: use a 64-bit host (PVE for example), and
> virtualize everything to run under it. Use 32-bit for KVMs unless they need
> >3G of RAM. OpenVZ contains will of course run 64-bit, as they share the
> kernel.
>
> There are no doubt exceptions to this, but it's a good start.
>
> For a LEMP server, you may want to consider separating EMP into 3 separate
> hosts. Doing it this way, you could have both a PHP51 host and a PHP53 host
> (LEMPP?), and let your (E)nginx host determine which one to use based on
> the url (reverse proxy configuration).
>
> Having things on a virtual platform opens up a lot of possibilities you
> don't have otherwise. The list is extensive. :)
>
> --
> -Eric 'shubes'
>
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The main difference between a programmer and a systems
administrator/architect is the ability to think in 3 dimensions, as
demonstrated by Shubes analysis of 64bit/32bit systems.

Programmers generally drill down; while systems people have a deeper, wider
analysis.

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