kicad-developers team mailing list archive

[Jon Evans <jon@xxxxxxxxxxxxx>]

Ha, I also keep around my Thinkpad T61 for occasional testing for this
purpose, although usually I avoid building on it as that takes a lonnnnnng
time.

On Tue, Oct 29, 2019 at 10:57 AM Drew Van Zandt <drew.vanzandt@xxxxxxxxx>
wrote:

> Let me encourage some of y'all to stick with an older machine, or keep it
> around for testing... the latest build of KiCAD is noticeably laggy on my
> machine, which is not terribly fast (but also not that old).  It makes some
> of the bugs I have reported worse, and their fixes have been pushed out to
> 6.x (for perfectly good reasons).
>
> I am a bit manic, though, as Jon can attest; patience is last on my list
> of accessible virtues.
>
>
> *Drew Van Zandt*
>
>
> On Tue, Oct 29, 2019 at 10:40 AM Simon Richter <Simon.Richter@xxxxxxxxxx>
> wrote:
>
>> Hi,
>>
>> On Mon, Oct 28, 2019 at 10:20:45PM -0700, Andrew Lutsenko wrote:
>>
>> > I kinda expected 2x maybe 3x decrease because not all computations scale
>> > linearly with number of threads. I was pleasantly surprised by almost 6x
>> > decrease in clean build time and 5x in incremental builds.
>>
>> FWIW, we have a number of bottlenecks in the build process:
>>
>>  - dependency generation of common doesn't start until the version header
>>    is generated, which only happens after bitmaps and gal are complete
>>  - dependency generation of pcbnew_kiface doesn't start until the python
>>    wrapper is generated, which takes ages itself.
>>  - the python wrapper is compiled as one of the last things, and the
>> linker
>>    must wait for that.
>>
>> We could probably shave off another two or three minutes of build time if
>> we could make sure that we always make progress on the critical path. The
>> dependency generation as a side effect pulls all the sources and headers
>> into cache, which reduces the effects of I/O latency a bit during
>> compilation, so parallelizing with more than the number of threads you
>> actually have is probably counterproductive.
>>
>> Numbers with CPU time as percent of real time:
>>
>>                 clean   ~15     ~5      tip
>> E5-2620v4 (32)  7:04.87 5:18.74 5:16.64 3:40.92
>>                 2243%   1854%   1854%   1330%
>> T2P9D01 (64)    5:16.37 4:14.04 4:10.26 3:20.97
>>                 3360%   2558%   2570%   1546%
>>
>>    Simon
>>
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