[OE-core] Default value for FULL_OPTIMIZATION
Khem Raj
raj.khem at gmail.com
Wed Feb 3 22:37:53 UTC 2016
> On Feb 3, 2016, at 1:08 PM, Phil Blundell <pb at pbcl.net> wrote:
>
> On Wed, 2016-02-03 at 12:59 -0800, Khem Raj wrote:
>> in systems of this age it should be yet.
>
> Sorry, I didn't really understand that comment.
systems of today ( new systems ). read ‘yet' as 'yes'
>
> For what it's worth, as a very quick and fairly unscientific comparison,
> I did "time make -j4" in a glibc tree and got:
>
> real 1m38.812s
> user 4m6.420s
> sys 0m23.148s
>
> and then I cleaned the tree and did "time make -j4 CFLAGS='-O2 -g
> -pipe'" and got:
>
> real 1m37.299s
> user 4m21.420s
> sys 0m27.304s
>
> I'm not sure these results are statistically significant but on this
> very limited evidence it certainly doesn't look like -pipe is providing
> any transformational benefits. The real time has gone down a tiny bit,
> which suggests that -pipe is giving some extra parallelism, but the
> system and user time have both actually gone up in the second case.
Some bigger loads like webkit might be a better sample.
>
> p.
>
>
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