[Libre-soc-bugs] [Bug 199] Layout using coriolis2 main core, 180nm

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Wed Jul 22 15:12:43 BST 2020


--- Comment #28 from Jean-Paul.Chaput at lip6.fr ---
(In reply to Luke Kenneth Casson Leighton from comment #27)
> (In reply to Jean-Paul.Chaput from comment #26)
> > (In reply to Luke Kenneth Casson Leighton from comment #25)
> > > Jean-Paul: ta-daaaa :)
> > > https://ftp.libre-soc.org/2020-07-22_10-55.png
> > > 
> > > that's from last night.
> > 
> > 
> > Very nice. Almost completed whitout any optimization, that's a good omen.
> indeed.  and it's soo preeettyyyy :)
> > I'm working on the "hierarchical" option. We will see which is best...
> > But the flat way seems still working.
> yes - i think there's still some "configs" not connected? (what string
> am i looking for to double-check that?)

  To be used with profit, you need to understand the overall way the
  P & R algorithm and data works. This would need a not so short
  explanation. Besides I'm also testing a "routing driven" placement
  which is not comited yet. I will experiment, then send you back
  the right set of tuning parameters.
    And, yes, I really do need to write a documentation about how
  the P & R works and how it relates to the configuration parameters
  so people can play too ;-)

> > Can you give me the total P&R time (as returned by the time command) ?
> ha, i have to re-run it.  bear in mind i am clamping the processor speed
> on this laptop to 1ghz, to avoid the fan running permanently, pulling in
> massive amounts of dust.

  Nice feature. What (Linux) software does that? I'm interested.
  Especially since my laptop seems to develop the habit of overheating
  in my backpack when put in "suspend to RAM". Now I'm using suspend
  to disk, praying there will be no memory corruption...

  Don't bother. But if you have the whole trace, I can get the
  numbers from there. Especially the placement time and the
  layer assignment step, which is *way* too slow, have to find
  out where I did put a quadratic thing inside...

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