[PySide] PySide6 Video

[Cristián Maureira-Fredes]

Hey Jason,

thanks for the feedback!

It seems there was a mistake with the uploaded video,
and in fact that's the faulty version that has a really long 
black-screen after the real talk.

(1) The audio is terrible too...I'm sorry about that,
but there should be related to being the faulty version.
The talk was recorded on a studio, so I would also expect a better audio
quality.

(2) Thanks! we will consider it for the next webinars/tutorials/talks

(3) Indeed there has been a lot of people contributing to the project,
not only with patches, but with constructive criticism and other ideas.
Still there is a lot of  things to do, to leave PySide as a proper 
member of the Python ecosystem, but hopefully we will be there soon.

(4) Sadly I don't have access to the videos,
but I can do offer the slides and demo-videos (no audio though)
on this link: http://maureira.xyz/qtforpython_qtws2020/

(5) No :(

(6) This is a critical topic. Maybe you remember some old emails
about threading, and some problems with the GIL. In a nutshell,
we required to completely revert the hold/release mechanism we
had in place for PySide https://bugreports.qt.io/browse/PYSIDE-803
and the whole team spent a lot of time doing so.

At the moment, if you look at QThread, for example, we have some
methods with an atribute 'allow-thread="yes"' on the typesystem,
which is releasing the GIL and get into a pure QThread call
(using Py_BEGIN_ALLOW_THREADS and Py_END_ALLOW_THREADS)
but as you can see, still we need to deal with the GIL. [1]

We could create a benchmark comparing a multiprocessing vs QThread
run, but I don't expect we will get numbers that are too different,
since there are still some bits of code implemented in C for the
multiprocessing module.

By any chance, do you have some benchmark in mind? or maybe
know a situation that could be cool to try out?

Cheers!


[1] 
https://doc.qt.io/qtforpython/shiboken6/typesystem_manipulating_objects.html?highlight=allow%20thread



On 3/3/21 4:47 AM, Jason H wrote:
> I watched Qt/Christian's video at https://youtu.be/1ljPk7ZInRo about PySide6.
> 
> I have a few comments.
> 1. The audio is terrible, there's a lot of reverberation like it was filmed in a empty conference room, and a small one at that.
> 2. having the speaker inside with the slide is the entire screen is a huge visual improvement over previous Qt videos. Very nice to see!
> 3. I was very impressed with all the progress made towards making pyside a proper python community member.
> 4. The video seemingly ends at 26:54, But I continues silent and black for another hour and 4 minutes.
> 5. There's like a minute of green screen at the end. Easter egg? Doesn't seem like a Marvel post-credits scene...
> 
> 6. The biggest caveat to using Python as I understand it is multi-threading. The python global interpreter lock requires use of the "multiprocessing module" however there is huge performance degradation as a result, whereas a QThread/QRunnable would be ideal. Is there a way to thread this needle and get concurrency through Qt?
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