transfer /opt/local to another machine

[j. van den hoff]

On Mon, 13 Apr 2015 11:34:29 +0200, Chris Jones <jonesc at hep.phy.cam.ac.uk>  
wrote:

> On 13/04/15 10:27, j. van den hoff wrote:
>> thanks to both of you for your answers and clarifications.
>>
>> On Mon, 13 Apr 2015 04:04:14 +0200, Ryan Schmidt
>> <ryandesign at macports.org> wrote:
>>
>>>
>>> On Apr 12, 2015, at 5:54 AM, j. van den hoff wrote:
>>>
>>>> I just have upgraded two x86_64 machines from 10.9. to 10.10.3 and
>>>> upgraded one of them according to the migration guide (i.e.
>>>> uninstalled/reinstalled all ~ 800 macports packages). this took an
>>>> astonishing long time (over night, basically) partly due to a
>>>> multi-hour recompilation of the `atlas' library. and that was on the
>>>> faster machine with an SSD...
>>>
>>> This is intentional, because atlas is performance-sensitive, so the
>>> port is deliberately programmed to not use precompiled binaries from
>>> our build server, and to instead build on your computer. My
>>> understanding is that the build process builds atlas many times, with
>>> different compiler settings, then tries out each one to see which one
>>> is actually fastest on your particular computer, then installs that
>>> one. That's why it takes so long.
>>
>> yes, I understand that. I'm not sure, however, how much of a performance
>> hit I will see when using the intel core-i7 optimized binary on an intel
>> core 2 duo, so I just would try it out, whether it's OK for my use (that
>> would mean via `octave', which I am using only sporadically, so ...).
>
> If the core-i7 build is using CPU instructions your core 2 due does not  
> have, then the performance hit will be 'significant' (i.e. it simply  
> will not run...).

OK, _that_ I would note and accordingly would recompile ;-). I'm not  
trying to avoid that at all costs, anyway. being able to transfer an  
existing comprehensive macports installation to further machines seems  
valuable in itself I would say, e.g. if you are on a slow internet  
connection or just want to quickly get some "canonical" set of software  
running on the other machines. at least if such a procedure is not calling  
for real trouble (except with atlas, probably).

>


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