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Re: Introduce Beam_scoring_problem::quant_range, for quickly filtering o
From: |
Han-Wen Nienhuys |
Subject: |
Re: Introduce Beam_scoring_problem::quant_range, for quickly filtering out invalid positions. (issue4129050) |
Date: |
Mon, 7 Feb 2011 12:08:37 -0200 |
On Sat, Feb 5, 2011 at 1:51 PM, Mike Solomon <address@hidden> wrote:
>>> True, although I think it's important to account for all beaming cases if
>>> possible.
>>
>> This is a performance optimization, ie. a way to run collision
>> detection without performance impact if the object does not really
>> collide, so it does not need to deal with all cases.
>>
>
> From reading the code (correct me if I'm wrong), the upper collision in the
> attachment would be taken into account because its stems all point in the
> same direction, whereas the bottom one would not because its first and last
> stem do not completely reflect the beam's stems' directions.
?
I'm intending to short-cut situations like the one in the image
attached; the lower note head is outside the range allowed for the
beam, so it makes no sense checking it for collisions.
> Is there any way that I could measure what type of performance hit LilyPond
> is taking with this more robust beam-collision code? I am not really
> qualified to speak to what type of trade-off is acceptable, but it'd be good
> to have an actual benchmark to make the comparison.
You can get a rough impression using ly:beam-score-count. Another
option is to run a profile on a beam-heavy piece. The last time I did
that, IIRC, beam scoring was ~ 10% of total time spent: not enough for
it to be worth optimizing a lot, but important enough that making it
much slower will be noticeable. This was a long time ago, so, the
balance of expenses may have changed though.
--
Han-Wen Nienhuys - address@hidden - http://www.xs4all.nl/~hanwen
c.preview.png
Description: PNG image
- Introduce Beam_scoring_problem::quant_range, for quickly filtering out invalid positions. (issue4129050), hanwenn, 2011/02/04
- Re: Introduce Beam_scoring_problem::quant_range, for quickly filtering out invalid positions. (issue4129050), mtsolo, 2011/02/04
- Re: Introduce Beam_scoring_problem::quant_range, for quickly filtering out invalid positions. (issue4129050), Han-Wen Nienhuys, 2011/02/04
- Re: Introduce Beam_scoring_problem::quant_range, for quickly filtering out invalid positions. (issue4129050), Mike Solomon, 2011/02/04
- Re: Introduce Beam_scoring_problem::quant_range, for quickly filtering out invalid positions. (issue4129050), address@hidden, 2011/02/04
- Re: Introduce Beam_scoring_problem::quant_range, for quickly filtering out invalid positions. (issue4129050), Han-Wen Nienhuys, 2011/02/05
- Re: Introduce Beam_scoring_problem::quant_range, for quickly filtering out invalid positions. (issue4129050), Mike Solomon, 2011/02/05
- Re: Introduce Beam_scoring_problem::quant_range, for quickly filtering out invalid positions. (issue4129050),
Han-Wen Nienhuys <=
Re: Introduce Beam_scoring_problem::quant_range, for quickly filtering out invalid positions. (issue4129050), percival . music . ca, 2011/02/04