Setting things up for using parallel STL C++17

[Scott Kostyshak]

On Wed, Aug 31, 2022 at 12:32:18PM +0200, Pavel Sanda wrote:
> On Tue, Aug 30, 2022 at 09:36:42PM -0400, Scott Kostyshak wrote:
> > > > Does anyone know of any candidates in LyX's code for using such
> > > > parallelization? 
> > > 
> > > - As written in another thread if you can get parallel graphics conversions
> > >   for document load and export, that would be cool.
> > 
> > This indeed seems like a good candidate since likely the current
> > sequential code can't be sped up much. Can someone tell me where in the
> > code the parallelization should take place? Perhaps the while loop
> > inside LoaderQueue::loadNext() ?
> 
> Long time ago I was trying double speedup (had 2 cores) by adding
> second process in ForkedCalls.cpp::callNext, but it was not working
> correctly and I never get to debug it. But you are right that LoaderQueue
> needs to be changed, probably by adding additional consumer(s).

Interesting. In any case, I didn't realize that looking at our queues is
a great place to consider parallelization. Thanks for pointing that out.

> > By the way, I've sometimes wanted a more aggressive graphics loader. I
> > think it's pretty impressive how it currently works and converts things
> > on-the-fly with scrolling, but I would like to be able to say "don't
> > wait for me to scroll, just start converting after I open the .lyx
> > file". I know that would involve a lot of wasted cycles, but sometimes I
> > would prefer that.
> 
> The same here. If you come up with lfun to load up everything in background
> that would be useful.

I am guessing that you would be against a "performance" tab in LyX? For
example, "Performance" is one of the 6 preference categories of Okular.
The option within there I like the most is "Memory Usage". I can set it
to "Greedy" and then zoom in far to PDF and still be able to scroll. I
like having that control. But I understand that we want to be careful
before adding more preferences.

Scott
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