[CentOS-devel] EPEL and i686

On 01/25/2014 01:32 AM, Stephen John Smoogen wrote:
>
>
>
> On 24 January 2014 16:00, Todd Rinaldo <toddr at cpanel.net 
> <mailto:toddr at cpanel.net>> wrote:
>
>
>     On Jan 24, 2014, at 4:29 PM, Karanbir Singh <mail-lists at karan.org
>     <mailto:mail-lists at karan.org>> wrote:
>
>     > On 01/24/2014 10:26 PM, Manuel Wolfshant wrote:
>     >> On 01/25/2014 12:13 AM, Karanbir Singh wrote:
>     >>> Hi
>     >>>
>     >>> Whats the plan for EPEL i686 / EL7 ? Does anyone know if there
>     is even
>     >>> going to be a multilib attempt or is everything going to stay
>     x86_64 clean ?
>     >> they build for x86_64 and ppc64 only,
>     >
>     > So then the question is - what is the process to enable i686
>     there ( or,
>     > do we then need to own all of EPEL - atleast some subset )
>     locally if we
>     > are going to attempt a i686 CentOS build ?
>     >
>     > - KB
>
>     Could I ask what the use case is for i386 support? I know that the
>     pointers are smaller but memory is cheap. Is this a speed or a
>     hardware or a can it be done goal?
>
>
> There are several items I see i686 support being needed:
>
> 1) Memory is not cheap in cloud and hosted environments. Especially in 
> cloud where you might be firing up a thousand hosts at a time.
> 2) Multiple Virtual Machines don't do well in the transition from 32 
> bit to 64 bit in that their memory usage doesn't go up by *2 but can 
> be ^2 depending on the workload. Python is a perfect example of this 
> but there are cases in java and other 'virtual machine' environments 
> where it happens.
> 3) As nice as having i686 compat libraries are for some commercial 
> apps you end up needing a lot more than what is provided by the OS. 
> This really comes up when you have to run a mixed set of commercial 
> binaries that need something that only EL7 provides but also needs 
> stuff that EL6 had. Thus you end up needing i686 everything.
for what is worth I have some _expensive_ EDA tools from Incisive which 
bundle 64bit binaries in the supposedly 32bit toolchain as well as an 
IBM tool which requires a 32bit OS lib in its _64_bit toolchain....

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