Setting things up for using parallel STL C++17

[Scott Kostyshak]

On Wed, Aug 31, 2022 at 10:02:55AM -0400, Scott Kostyshak wrote:
> 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.

Logging another reason: I like to have the scroll-bar accurate.

Scott
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