Re: Testing optimize-for-size suitability?

[Arjan van de Ven]

On Sun, 2005-01-16 at 10:40 -0500, Steve Snyder wrote:
> Is there a benchmark or set of benchmarks that would allow me to test the 
> suitability of the CONFIG_CC_OPTIMIZE_FOR_SIZE kernel config option?
> 
> It seems to me that the benefit of this option is very dependant on the 
> amount of CPU cache installed, with the compiler code generation being a 
> secondary factor.  The use, or not, of CONFIG_CC_OPTIMIZE_FOR_SIZE is 
> basically an act of faith without knowing how it impacts my particular 
> environment.
> 
> I've got a Pentium4 CPU with 512KB of L2 cache, and I'm using GCC v3.3.3.  
> How can I determine whether or not CONFIG_CC_OPTIMIZE_FOR_SIZE should be 
> used for my system?

it also saves 400 kb of memory that can be used by the pagecache now...
that doesn't show in a microbenchmark but it's a quite sizable gain if
you remember that a disk seek is 10msec..that is a LOT of cpu cycles..

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