Fwd: lily rO><Or!

[Maurits Lamers]

I got this reply off-list, so I'll put it back on-list :)

Greets 

Maurits

Begin forwarded message:

> From: Bec and John Silva <address@hidden>
> Date: 28 augustus 2005 3:27:16 GMT+02:00
> To: Maurits Lamers <address@hidden>
> Cc: Han-Wen Nienhuys <address@hidden>
> Subject: Re: lily rO><Or!
>
> Hi Maurits,
>
> I have nothing to do with the development of Lilypond and I have done very little more than a super-quick scan through a few of the source files, so what I say is a complete guess.
>
> I suspect that Lilypond could be made to layout a single measure if requested, but I think one of the main advantages of Lilypond's output is that it takes the entire score into consideration when calculating the layout. If a feature was added which could isolate calculations to just differences in the score, a user would run the risk of forgetting to recalculate the entire score for optimum layout (and personally, I'm always against letting users mess up their own work).
>
> I know the time to calculate can be a bit long for this computer-age of "it must happen right now!", but I've found that it causes me to do more work between previews. I've also found that the more proficient I get at Lilypond the less bothered I am with non-instantaneous previews.
>
> Just my thoughts.
>
> - John
>
>
> > I was wondering...
> >
> > if you cannot optimize the code itself very much. maybe it is possible to improve the way Lilypond parses the ly file.
> >
> > When I am editing and tweaking a file, I need to change one little thing and recompile it.
> > As far as I can see it, lilypond then always runs the complete file from scratch...
> >
> > Maybe it is possible to provide lilypond with a kind of diff function that enables it to determine the changes and change only what is necessary ?
> > (by saving states for example...) Or is this impossible ?
> >
> > If this could work it could mean quite a speed improvement...
> >
> > greets
> >
> > Maurits
> >
> > On 24-aug-05, at 22:00, Han-Wen Nienhuys wrote:
> >
> >
> > > Nicolas Sceaux wrote:
> > >
> > > > Wahou. This used to be around 40 minutes, in an slightly older
> > > > computer, with multiple lilypond invocations.
> > > > Lily is getting so cool. Kuddos to Han-Wen and Jan!
> > >
> > > Thanks!
> > >
> > > the downside to this is that there is little left to optimize, I still think Lily is a bit slow, but with painstaking optimization, I've only been been able to get some 10 to 30 % during the 2.7 cycle.
> > >
> > >
> > > -- 
> > > Han-Wen Nienhuys - address@hidden - http://www.xs4all.nl/~hanwen
> > >
> > >
> > > _______________________________________________
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> > > address@hidden
> > > http://lists.gnu.org/mailman/listinfo/lilypond-user
> >
> >
> >
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