Messages in this thread | | | Subject | Re: Testing optimize-for-size suitability? | From | Arjan van de Ven <> | Date | Sun, 16 Jan 2005 16:46:43 +0100 |
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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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