kicad-developers team mailing list archive

[Carl Poirier <carl.poirier.2@xxxxxxxxx>]

There are some things in the code that don't like being multithreaded. If I
parallelize the for loop in RN_DATA::Recalculate( int aNet ), I get a
segfault. It does not happen if I put a lock to the call updateNet( i ),
but obviously there is no increase in performance. I'm trying to find out
what's the problem now.


On Tue, Jan 14, 2014 at 9:18 PM, Carl Poirier <carl.poirier.2@xxxxxxxxx>wrote:

> Well, if OpenMP is alright with you, I'll give it a shot this weekend.
>
>
> On Tue, Jan 14, 2014 at 5:12 AM, Marco Serantoni <
> marco.serantoni@xxxxxxxxx> wrote:
>
>> Nice,
>> But please, think before add dependencies and look deeply if those are
>> supported for all platforms, I wish being able to don't trash years of work.
>>
>>
>>
>> --
>> Marco
>>
>>
>> On Tue, Jan 14, 2014 at 11:00 AM, Maciej Sumiński <
>> maciej.suminski@xxxxxxx> wrote:
>>
>>> Great, now it seems that we have a group of people who are experienced
>>> with the subject. I believe this has to end up with some speed up in KiCad.
>>>
>>> Regards,
>>> Orson
>>>
>>>
>>> On 01/14/2014 10:59 AM, Marco Serantoni wrote:
>>>
>>>> Only the warning: keep attention that boost::context doesn't support the
>>>> context switch for the vector registers
>>>> (mmx*/v*).
>>>> If needed i can help you to implement.
>>>>
>>>>
>>>> --
>>>> Marco
>>>>
>>>>
>>>> On Mon, Jan 13, 2014 at 7:48 PM, Vesa Solonen <vesa.solonen@xxxxxxxx
>>>> <mailto:vesa.solonen@xxxxxxxx>> wrote:
>>>>
>>>>     13/01/14 10:04, Maciej Sumiński kirjoitti:
>>>>
>>>>      > I fully support the idea, in fact I have dreamed about this too
>>>>      >
>>>>     (http://www.ohwr.org/projects/cern-kicad/wiki/ratsnest-gal#
>>>> Possible-upgrades).
>>>>      > I had a short try with OpenMP, but I did not get any better
>>>>     results, so
>>>>      > it seems that I could have done it wrong.
>>>>
>>>>     Some articles:
>>>>     http://locklessinc.com/articles/vectorize/
>>>>     http://gcc.gnu.org/projects/tree-ssa/vectorizathttps://
>>>> twiki.cern.ch
>>>>     https://twiki.cern.ch/twiki/bin/view/CMSPublic/
>>>> WorkBookWritingAutovectorizableCode
>>>>
>>>>     Some tools:
>>>>     http://code.entropywave.com/blog/
>>>>     http://gnuradio.org/redmine/projects/gnuradio/wiki/Volk
>>>>
>>>>     ORC may be the best tool to go with. GNU Radio's DSP stack and
>>>> GStreamer
>>>>     depends on it.
>>>>
>>>>      > If there are volunteers who have some experience with
>>>>     parallelization I
>>>>      > am very eager to cooperate to speed up some of computations. The
>>>>      > ratsnest algorithm is a perfect place to start with. It is
>>>>     performed on
>>>>      > per net basis, so they are all independent to each other.
>>>>
>>>>     I could possibly do something, but I'm not familiar with much of the
>>>>     Kicad code. Single function "optimise this ->" might work, but
>>>> delivery
>>>>     times can't be guaranteed...
>>>>
>>>>     -Vesa
>>>>
>>>>
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>>>
>>
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>