Re: [PATCH] configure: add gcc flags for better link-time optimization

[Rich Felker <dalias@libc.org>]

On Sat, Oct 24, 2015 at 02:43:12PM +0200, Szabolcs Nagy wrote:
> * Denys Vlasenko <vda.linux@googlemail.com> [2015-10-24 00:00:56 +0200]:
> > What's importand is how many pages are dirtied.
> > Here's a test with Aboriginal's x86_64 static busybox:
> > 
> ....
> > 
> > No. Only two pages are mapped, not three.
> > 
> > This is pretty impressive. However, this is a small busybox config:
> > only 31 applet.
> > 
> > I have a complete (~320 applets) 32-bit static busybox config built
> > against uclibc, and it has only 2 pages .data+.bss
> > 
> > Will test & see how close to that can musl get.
> > 
> 
> http://www.etalabs.net/compare_libcs.html
> 
> hm this says min dirty is 3pages on uclibc with static linking.

I believe I counted one page of stack in these figures.

> in case you repeat the experiments with glibc
> a 'dirty pages with static busybox' entry would be
> useful on that comparision page.

Yes. Before doing much more on the comparison page though I think we
should develop a good reproducible way to run these tests. I was ok
with something casual when musl was first launched but it feels
inappropriate to continue without something more rigorous.

Rich