Re: strange multiplot behavior with wxt

On Wed, 28 Jun 2023, Ethan A Merritt wrote:

> 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.

Thanks, Ethan! I've built gnuplot 6.1.0 from gnuplot-main git and 
tested on Fedora: it works fine. I'll also try on Arch with more 
recent wx, but it looks like you've nailed the problem.

Just wondering: are you likely to cherry-pick this fix into 
branch-5-4-stable?

Allin Cottrell

>
> 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

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