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Re: compile time regressions (was: merging for 3.4)


Benjamin Kosnik wrote:-

> >  >   gcc-3.0.4/bin/g++    45.45 user
> >  >   gcc-3.1.1/bin/g++    57.79 user  +27%
> >  >   gcc-3.2.1/bin/g++    59.30 user  +30%
> >  >   gcc-current/bin/g++  72.29 user  +59%
> 
> These indicate, to me, that the slowdown has nothing to do with
> libstd++-v3. There just weren't substantial changes in the library
> includes to cause this kind of slowdown between 3.0.x and 3.2.x.
> 
> It also indicates the PCH will be less and less useful unless the other
> bits are brought back to normal. Depressing.

That's what scares me about PCH - I'm afraid it'll be used as an excuse
not to fix some of the real problems we have, because "we're fast enough
now".  I'd rather wait until we have good performance without PCH before
allowing PCH, though I realize that's not gonna fly.

Neil.


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