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Re: gcc compile-time performance


On Sat, May 18, 2002 at 11:48:11AM -0600, law@redhat.com wrote:
> In message <20020518171850.8973EF2A59@nile.gnat.com>, Robert Dewar writes:
>  > > In order to support those uses, and to be competitive with other
>  > > compilers, we do need to improve the speed of the compiler.  I've heard
>  > > this from too many real world customers with spending authority to
>  > > believe any different.
>  > 
>  > The question is can you find ways to make substantial increases in speed.
>  > I still don't see it being worthwhile to flail away looking at profiles and
>  > tingering with conditionals. You are only going to get 10-30% that way
>  > and it is not going to be enough to be significant. 
> I disagree strongly.   We've got customers where a 30% improvement in
> compile-time means cutting a day off their build cycles.  I don't know
> precisely how much time it would cut off (for example) a build of RHL, but
> I would bet it would be enough to send our OS team into a state of ecstasy.

Absolutely seconded.  Even a minimal build cycle is about six hours for
our product, distributed over a substantial number of machines. 
Compile speed is very important to us as it grows.

(Although fixing Solaris [with a hammer] might still get us more
advantage than fixing GCC...)

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer


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