[ltp] Power saving: self-compiled vs. binary

[Florian Manschwetus]

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Matthias Redlich wrote:
> Hello,
> 
> in general there are two different package management systems:
> 
> * systems like apt/rpm using binary packages
> * systems like ports in Gentoo where every single package has to be compiled before installation
> 
> For sure both systems have their own advantages and I do not want to start a new flame-war. The question I am interested in is whether there are significant advantages concerning power saving when you compile your system from scratch with optimization flags for your CPU or not. Has anybody ever measured that? What do you think about that?
> 
> Regards
> Matthias
I am convinced, yes it saves power because the specific cpu funktions 
like sse sse2 sse3 are used, so more work can be done by less cpu, and 
often more efficient. (I use gentoo testing on t60). Furthermore i read 
something pointing to gcc 4 that he tries to optimize when compiling for 
pentium-m the efficiency of the binaries to hopefully save power (never 
tested if there is in fact an effect, but i'm used with gentoo before 
and enjoying a nice and comfortable system)
florian
Florian

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