Re: [Doxygen-users] doxygen 1.8.9 (and also 1.8.7) extremely slow for vhdl

[Dimitri v. H. <do...@gm...>]

Hi Walter,

> On 30 Dec 2014, at 16:24 , Walter F.J. Mueller <w.f...@re...> wrote:
> 
> Hi,
> 
> I'm using doxygen to generate a 'source code browser pages' for a
> medium sized VHDL project. Some is publicly visible under
>    http://www.retro11.de/doxy/w11/vhd/html/hierarchy.html
> Total volume is
>   ~   450 files
>   ~ 85000 lines
> 
> With doxygen 1.8.7 it took about 32 sec to generate the files !
> 
> With doxygen 1.8.9 this slowed down to a snake-speed crawl. Even after
> more than 18 CPU hours (!!) the files aren't done. The job  isn't hung,
> it's very slowly progressing, one sees a new 'Generating docs' line
> very few minutes. Resource consumption seems reasonable top gives
> 
>      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
>      30  10  125660  73620   4688 R  99.8  1.8   1100:32 doxygen
> 
> I also tried doxygen 1.8.8, same observation, it proceeds, but at
> a dreadfully slow pace.
> 
> In 1.8.8 the VHDL parser was changed, in 1.8.9 many VHDL fixes
> were done. So my question:
> 
>    Does anybody else see such dramatic performance issues with
>    doxygen 1.8.8/1.8.9 and VHDL ?

That doesn't sound right.
Would be nice to understand what doxygen is doing but I haven't been able to reproduce this.

What options are enabled?
Can you do some profiling? Can you run with the '-d time' option for instance?
Does this also happen if you use a smaller subset of the code?

Regards,
  Dimitri