Re: strange multiplot behavior with wxt

Valgrind finds a test of an uninitialized flag "hidden" that could
plausibly be involved here.
I have corrected that by setting the flag to FALSE in the one place
that I could see initialization omitted, but I do not actually
understand why that code path is triggered by this test case (it is
the response to a "refresh" command).  That makes valgrind happy, so
maybe it will fix your display also.  I'll leave the tracker issue
"open" for now.


On Wed, Jun 28, 2023 at 10:31 AM Allin Cottrell <[email protected]> wrote:
>
> On Wed, 28 Jun 2023, Ethan A Merritt wrote:
>
> > On Wednesday, 28 June 2023 05:50:15 PDT Allin Cottrell wrote:
> >> I'm puzzled by a multiplot example where the output seems to be
> >> non-deterministic -- though the fault may be in my script
> >> (strange_multi.plt, attached).
> >>
> >> I'm on Linux, using gnuplot 5.4.3 and also 5.4.8, using
> >> the wxt terminal for screen display with the command line
> >>
> >> gnuplot strange_multi.plt -persist
> >
> > I have kept source and executables around for many versions of gnuplot.
> > I can reproduce your "missing bars in first plot" symptom with old
> > executables for 5.4.0 through 5.4.6, but not with 5.4.8 or the
> > development branch.  Any given executable seems to be 100% reproducible
> > in either failing or succeeding.
> >
> > But here's the thing - if I rebuild 5.4.3 from the same original
> > source, I get a new executable that does not exhibit the problem.
> > So my suspicion is that the difference is the version of the
> > wx- shared libraries the binary is linked against.
> >
> > old gnuplot_5.4.3 binary (built May 2022)
> > [~/temp] ldd /usr/local/bin/gnuplot_5.4.3 | grep wx
> >        libwx_gtk3u_xrc-3.1.so.5 => /lib64/libwx_gtk3u_xrc-3.1.so.5 (0x00007fc634b09000)
> >        libwx_gtk3u_html-3.1.so.5 => /lib64/libwx_gtk3u_html-3.1.so.5 (0x00007fc634a25000)
> >        libwx_gtk3u_qa-3.1.so.5 => /lib64/libwx_gtk3u_qa-3.1.so.5 (0x00007fc6349f6000)
> >        libwx_gtk3u_core-3.1.so.5 => /lib64/libwx_gtk3u_core-3.1.so.5 (0x00007fc634000000)
> >        libwx_baseu_xml-3.1.so.5 => /lib64/libwx_baseu_xml-3.1.so.5 (0x00007fc6349e2000)
> >        libwx_baseu_net-3.1.so.5 => /lib64/libwx_baseu_net-3.1.so.5 (0x00007fc63497f000)
> >        libwx_baseu-3.1.so.5 => /lib64/libwx_baseu-3.1.so.5 (0x00007fc633c00000)
> >
> > new gnuplot_5.4.3 binary (built today)
> > [~/temp] ldd ~/cvs/gnuplot-5.4.3/src/gnuplot | grep wx
> >        libwx_gtk3u_xrc-3.2.so.0 => /lib64/libwx_gtk3u_xrc-3.2.so.0 (0x00007f3cedc64000)
> >        libwx_gtk3u_html-3.2.so.0 => /lib64/libwx_gtk3u_html-3.2.so.0 (0x00007f3cedb83000)
> >        libwx_gtk3u_qa-3.2.so.0 => /lib64/libwx_gtk3u_qa-3.2.so.0 (0x00007f3cedb54000)
> >        libwx_gtk3u_core-3.2.so.0 => /lib64/libwx_gtk3u_core-3.2.so.0 (0x00007f3ced200000)
> >        libwx_baseu_xml-3.2.so.0 => /lib64/libwx_baseu_xml-3.2.so.0 (0x00007f3cedb42000)
> >        libwx_baseu_net-3.2.so.0 => /lib64/libwx_baseu_net-3.2.so.0 (0x00007f3cedade000)
> >        libwx_baseu-3.2.so.0 => /lib64/libwx_baseu-3.2.so.0 (0x00007f3cece00000)
> >
> > But it's only a suspicion. [...]
>
> I have a little more information to contribute. I'm testing my
> example on two machines. The one I'm sitting at runs Fedora 36,
> with gnuplot 5.4.3 and wx 3.0.5 (per wx-config). The linkage is
>
> myrtle:~$ ldd /usr/bin/gnuplot | grep wx
>          libwx_gtk3u_core-3.0.so.0 => /lib64/libwx_gtk3u_core-3.0.so.0 (0x00007fa5bfc00000)
>          libwx_baseu-3.0.so.0 => /lib64/libwx_baseu-3.0.so.0 (0x00007fa5bf800000)
>
> On this machine I'm seeing the non-deterministic behavior.
>
> The other machine I'm accessing remotely via ssh. It runs current
> Arch Linux with gnuplot 5.4.8 and wx 3.2.2, linkage:
>
> robroy:~$ ldd /usr/bin/gnuplot | grep wx
>          libwx_gtk3u_core-3.2.so.0 => /usr/lib/libwx_gtk3u_core-3.2.so.0 (0x00007f5447a00000)
>          libwx_baseu-3.2.so.0 => /usr/lib/libwx_baseu-3.2.so.0 (0x00007f5447600000)
>
> On this more up-to-date system I now think I was wrong to say the
> behavior is non-deterministic. The plot appears somewhat slowly over
> the remote connection, and here's the reproducible sequence I'm
> seeing over 2 or 3 seconds:
>
> * an empty (black) window appears
> * the canvas goes to white
> * the first subplot appears, correctly
> * the second subplot appears, correctly
> * the data portion of the first subplot is wiped out to white
>
> Might this help with diagnosis?
>
> Allin Cottrell



-- 
Ethan A Merritt
Department of Biochemistry
University of Washington, Seattle


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