This is the mail archive of the
mailing list for the GCC project.
Re: gcc compile-time performance take 2
> On Mon, 20 May 2002, Jan Hubicka wrote:
> > Looks definitly very interesting. Do you think you can also
> > modify your scripts to oprofile cc1 binarry on the SPEC build?
> > Then we will have logged when particular function became
> > expensive. You are using PentiumPro class machine that has
> > better counters than Athlons...
> It depends on oprofile's overhead. The SPEC95 runs are already
> taking about 9-10 hours. I don't have too many cycles to spare.
> We can always save the compressed cc1 binaries and re-run with
> oprofile when we notice a slowdown.
oprofile has de-facto no overhead (ie 3-5%) to my experience, unless
the values are badly tunned...
> > The graph looks interesting, definitly. I am surprised it
> > grows so consistently over the development cycle (ie even in
> > the freezes). Perhaps it can be explained by filesystem
> > overhead or something...
> But the compiler is built on the same filesystem, it should be
> affecting bottstrap times the same way. In any case, I'll be
> keeping better track of these numbers from now on. The SPEC95
> runs should resume in a few more days.