[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

[Bud Davis]

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
> 
>