Re: plot and image demos (growing window)

[Daniel J Sebald]

Ben Abbott wrote:
> On Jun 2, 2009, at 12:31 AM, Daniel J Sebald wrote:
>
> > Rik, Ben,
> >
> > I've had an opportunity to try this out with numerous versions of  
> > gnuplot.  There is randomness to the window expansion.  That is, it  
> > isn't on ever plot that the window expands.  That fact seems to  point 
> > to gnuplot as the source, and the problem seems to exist as  far back 
> > as gnuplot version 4.2.0.  However, the expansion is at a  much slower 
> > rate, approximately once with every 200 to 300 plots.   With gnuplot 
> > version 4.2.5 the expansion rate is about once every 3  or 4 plots.  
> > There could be a timing issue made worse by new  additions to gnuplot 
> > over the years; one that shows up only when the  CPU is being 
> > completely taxed.
> >
> > I'll look into the gnuplot side of things (and if you want to send  
> > something to the gnuplot discussion list, feel free), but my advice  
> > would be to not spend too much effort tracking down exactly where  
> > Octave might cause a problem.  It might just be a random arrangement  
> > of code that works better than other versions.
> >
> > Dan
>
>
> I'd like to send something to the gnuplot developers. Unfortunately,  
> I'm unable to produce a gnuplot script that demonstrates the problem.  
> For some reason, I'm only able to demonstrate the problem when  
> communicating using the i/o stream (popen2) between octave and gnuplot.
>
> Any chance you have a gnuplot script that demonstrates the problem?

Sorry, no.  I've tried, but probably not as much as you have.  What you said in 
the previous paragraph is important, however.  The conflict/timing issue may 
have to do with the presence of another i/o stream.  I say another, because I 
believe gnuplot_x11 (the actual program that does the rendering of the X11 
plot) uses an i/o stream for mouse and gnuplot/gnuplot_x11 communications.  I 
recall the developers' comments about that being a difficult thing to program.  
Lots of traffic, high CPU use could be increasing the likelihood of some type 
of clash with the mouse.  It's difficult to tell exactly.

Dan