Am 16.04.2012 23:36, schrieb Scott Ritchie:
On 4/16/12 9:25 AM, Steve Langasek wrote:
Hi Mike,
On Mon, Apr 16, 2012 at 11:09:19AM -0400, Michael Terry wrote:
On 16/04/12 02:03, Steve Langasek wrote:
And regardless of which we decide to use as the default, both of
amd64 and
i386 will continue to be supported architectures for the length of
12.04 LTS
and will remain available for download.
There seems to be an unstated assumption that the default
recommended architecture needs to stay the same throughout the
lifecycle of 12.04 LTS. Is that true?
I don't see us making such a change for a point release. First, we
don't
typically get CDs pressed of point releases; second, there is going
to be
some confusion on the part of users about this change, and I think we
can
better mitigate that if changing it as part of .0 instead of as a point
release.
If we end up deciding to stick with i386 for now to better support
common hardware, this question will still be re-evaluated for a
future release. And when it changes, we could go back and change
the default download link and what is installed on the store USB
sticks for 12.04 LTS.
We could, but I'm pretty sure it's not worth it at that point.
Relatedly, I'm worried about what happens when these 12.04 users
upgrade to 14.04. It would be really unfortunate to have them still
on 32 bit by that point.
Unless, of course, we have ambitions of supporting automatic
cross-architecture upgrades by then.
Thanks,
Scott Ritchie
I would not bet that 14.04 users necessarily will have to get 64bit.
There is the recent x32-abi[1] development which kind of combines best
of both worlds.
This is also my concern with switching to 64bit by default. Most
programs actually do not need more than 4GB virtual memory and thus
64bit addresses are just a waste there.
Is there any evaluation taking into account the more aggressive compiler
optimization used for 64bit. (like auto vectorisation, SSE2)
It would be interesting whether the performance gain really comes from
the larger address space or those compile optimizations.
Greets,
Pavel
[1] http://en.wikipedia.org/wiki/X32_ABI
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