[Ns-developers] icc and "patched" waf

Timo Bingmann timo.bingmann at student.kit.edu
Thu Jan 22 05:24:56 PST 2009


On Thursday 22 January 2009 14:03:36 Mathieu Lacage wrote:
> hi timo,
> 
> 
> I won't comment on the waf problems but, if you are trying to get the
> most out of ns-3, the biggest impact you can have on the performance is
> to build a static binary: if you build all of the ns-3 object files
> without the -fPIC option and link them all in your script, you will get
> a fairly big boost in speed: when I did this by hand on a couple of
> examples, I got up to 40% runtime improvements. If you want to know how
> I did this, I just ran ./waf -v > output and then, wrote a couple of sed
> scripts to modify the output and feed this to a shell script.
> 
> Ideally, there would be a way to get non-dynamic libraries from our waf
> scripts but, I did not want to bother gustavo with this too much and I
> was not motivated enough to try to do it myself.
> 
> I hope this helps,
> Mathieu

Okay thanks for the hint, I'll try that out. I'm not into the speed testing phase yet. It was just some "let's try this out" morning-wake-up-coding.

Some initial profiling also showed that most time was spend in the cairo int128 library for time calculations.

Greetings
Timo


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