[Lemon-devel] Optimization flags

[Alpár Jüttner]

On Mon, 2007-01-22 at 20:13 +0100, Alpár Jüttner wrote:
> Hi,
> 
> I've made some comparison on the effect of gcc optimization flags. The
> test code is a graph algorithm implemented using LEMON (of course),
> compiled with gcc-4.1, the cpu is Intel T2500 (Core Duo).
> Here come the sizes of the executables, the compilation times and the
> running times of the algorithm with different optimization flags.
> There is no surprise in this table. I just post it to emphasize: *always
> use optimization!!!*

Well, the table seems to have been messed up a bit. I try to post it
again.

option: -O0 (default)
   exec. size:  216K
   compilation time:  1.8s
   running time:  7m22s

option: -Os
   exec. size:  116K
   compilation time:  2.7s
   running time:  2m43s

option: -O1
   exec. size:  64K
   compilation time:  2.8s
   running time:  35.5s

option: -O2
   exec. size:  64K
   compilation time:  3.3s
   running time:  27.7s

option: -O3
   exec. size:  56K
   compilation time:  3.4s
   running time:  26.7s

option: -O3 -ggdb
   exec. size:  561K
   compilation time:  3.9s
   running time:  26.8s

Alpar