[OE-core] Default value for FULL_OPTIMIZATION
Phil Blundell
pb at pbcl.net
Wed Feb 3 21:08:28 UTC 2016
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.
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.
p.
More information about the Openembedded-core
mailing list