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Re: [gfortran] patch for pr 21130 - 38822 lines of Fortran 90 takes more than 10 minutes to compile on a dual 3GHz P4 Linux box with lots of RAM
- From: Bud Davis <bdavis9659 at sbcglobal dot net>
- To: Paul Thomas <paulthomas2 at wanadoo dot fr>
- Cc: gcc-patches at gcc dot gnu dot org, fortran at gcc dot gnu dot org
- Date: Wed, 29 Mar 2006 04:09:14 -0800 (PST)
- Subject: Re: [gfortran] patch for pr 21130 - 38822 lines of Fortran 90 takes more than 10 minutes to compile on a dual 3GHz P4 Linux box with lots of RAM
i will profile it again and see where the next hot
spot is.
--bud
--- Paul Thomas <paulthomas2@wanadoo.fr> wrote:
> Bud,
>
> A last PS on this!
>
> My Athlon1700 takes 25 minutes 47 seconds to compile
> the testcase, whout
> the patch. With the patch, it takes 2 minutes 46
> seconds. ifort, on the
> other hand, takes 12 seconds to do the same job.
>
> We still have some work to do, in spite of the very
> remarkable
> improvement that you have made. I believe that
> module reading has to be
> broken up into two stages: (i) To read the module
> file and create a
> namespace with all the symbols on it; and (ii) To
> read the symbols from
> that namespace, according to the requirements of the
> USE statement, and
> to populate the current namespace with them. That
> way, the file IO and
> the processing is only done once for each module and
> each compilation.
>
> Paul
>
>