Re: [Maya-Python] Fast way to create QIcon in PySide2?

[Marcus Ottosson]

That would be gigaBITS

Realised this shortly after posting. :)

To answer your question Marcus, I guess I was doing it this way because it
used to work!

Hah, fair enough!
​

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Re: [Maya-Python] Fast way to create QIcon in PySide2?

[Michael Boon]

Yeah I had decided it was probably the same thing. The comments on the bug 
indicate that the person trying to fix it has misunderstood though - I 
think they are trying to cache image files, rather than defer loading them.

On Tuesday, 23 May 2017 08:02:36 UTC+10, Justin Israel wrote:
>
> Related? 
> https://bugreports.qt.io/browse/QTBUG-59621
>
> Justin
>
>
> On Tue, May 23, 2017 at 9:43 AM Michael Boon  > wrote:
>
>> Thanks. That sounds like good advice. I'll try it and get back to you. It 
>> bears out so far though - trying it in Maya 2017 I see a huge amount of 
>> swapping going on.
>>
>> To answer your question Marcus, I guess I was doing it this way because 
>> it used to work! The documentation for QIcon says "The file will be loaded 
>> on demand," and although it's not entirely clear what that means, in 
>> PySide2 it's definitely loading it before the icon has even been added to a 
>> visible widget.
>>
>>
>> On Tuesday, 23 May 2017 05:41:01 UTC+10, Justin Israel wrote:
>>
>>>
>>>
>>> On Tue, May 23, 2017, 3:42 AM Marcus Ottosson  
>>> wrote:
>>>
 Loading 50k jpegs at 512x512 at ~1 second?

 It sounds like Qt 4 was deferring the actual load of these files until 
 you viewed them, whereas Qt 5 is loading them into memory. Not impossible, 
 could be an optimisation on their part.

 But why on earth would you do this? :O Sounds incredibly inefficient. 
 Why not have icons instantiated when you view them, through the .data() 
 member of your model, and optionally cache them yourself where necessary?

 512 x 512 x 8 bits x 4 color channels x 50,000 images comes to 419 gb 
 of memory utilisation, unless some of your images are the same.

 What’s wrong with this picture?

>>> That would be gigaBITS ;-) . Also jpegs are 3 channel usually. So it 
>>> would be more like:
>>>   512x512x(8x3)/8 =  ~39GB of uncompressed image data. But it would 
>>> probably end up mostly going into swap memory. If you don't run out of 
>>> virtual memory and you aren't swapping too hard then your program could 
>>> function. It would then depend on how much of that data Qt wants to load 
>>> active at once. 
>>>
>>> That suggestion you made of implementing data() on the model, loading on 
>>> demand, and caching a realistic max number at a time, seems like it would 
>>> work great to solve this problem. 
>>>
>>>
>>> ​

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Re: [Maya-Python] Re: AABB intersect

[Cedric Bazillou]

Good luck with the pymel roll back

Not too long ago it seems mandatory people have to bash mel  in order to 
promote pymel we now have a new generation of maya user which are mel 
illiterates:
they cant use the expression editor, parse ascii file using maya components 
or understand user setup or module files. ( what really amuse is to see 
that if you want to obfuscate your code nowadays you can write it in mel...)

Even on the developer side at Autodesk there seems to be questionable move
The latest version of maya (2017)is the worse for that:  adding callback to 
close node editor and polluting our plateform each time you open a new file 
(3 seconds clean up...)  ( why is arnold/pose editor loading pymel which 
will override all the loaded python plugins ?)

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Re: [Maya-Python] Fast way to create QIcon in PySide2?

[Justin Israel]

Related?
https://bugreports.qt.io/browse/QTBUG-59621

Justin


On Tue, May 23, 2017 at 9:43 AM Michael Boon  wrote:

> Thanks. That sounds like good advice. I'll try it and get back to you. It
> bears out so far though - trying it in Maya 2017 I see a huge amount of
> swapping going on.
>
> To answer your question Marcus, I guess I was doing it this way because it
> used to work! The documentation for QIcon says "The file will be loaded on
> demand," and although it's not entirely clear what that means, in PySide2
> it's definitely loading it before the icon has even been added to a visible
> widget.
>
>
> On Tuesday, 23 May 2017 05:41:01 UTC+10, Justin Israel wrote:
>
>>
>>
>> On Tue, May 23, 2017, 3:42 AM Marcus Ottosson 
>> wrote:
>>
>>> Loading 50k jpegs at 512x512 at ~1 second?
>>>
>>> It sounds like Qt 4 was deferring the actual load of these files until
>>> you viewed them, whereas Qt 5 is loading them into memory. Not impossible,
>>> could be an optimisation on their part.
>>>
>>> But why on earth would you do this? :O Sounds incredibly inefficient.
>>> Why not have icons instantiated when you view them, through the .data()
>>> member of your model, and optionally cache them yourself where necessary?
>>>
>>> 512 x 512 x 8 bits x 4 color channels x 50,000 images comes to 419 gb of
>>> memory utilisation, unless some of your images are the same.
>>>
>>> What’s wrong with this picture?
>>>
>> That would be gigaBITS ;-) . Also jpegs are 3 channel usually. So it
>> would be more like:
>>   512x512x(8x3)/8 =  ~39GB of uncompressed image data. But it would
>> probably end up mostly going into swap memory. If you don't run out of
>> virtual memory and you aren't swapping too hard then your program could
>> function. It would then depend on how much of that data Qt wants to load
>> active at once.
>>
>> That suggestion you made of implementing data() on the model, loading on
>> demand, and caching a realistic max number at a time, seems like it would
>> work great to solve this problem.
>>
>>
>> ​
>>>
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Re: [Maya-Python] Fast way to create QIcon in PySide2?

[Michael Boon]

Thanks. That sounds like good advice. I'll try it and get back to you. It 
bears out so far though - trying it in Maya 2017 I see a huge amount of 
swapping going on.

To answer your question Marcus, I guess I was doing it this way because it 
used to work! The documentation for QIcon says "The file will be loaded on 
demand," and although it's not entirely clear what that means, in PySide2 
it's definitely loading it before the icon has even been added to a visible 
widget.


On Tuesday, 23 May 2017 05:41:01 UTC+10, Justin Israel wrote:
>
>
>
> On Tue, May 23, 2017, 3:42 AM Marcus Ottosson  > wrote:
>
>> Loading 50k jpegs at 512x512 at ~1 second?
>>
>> It sounds like Qt 4 was deferring the actual load of these files until 
>> you viewed them, whereas Qt 5 is loading them into memory. Not impossible, 
>> could be an optimisation on their part.
>>
>> But why on earth would you do this? :O Sounds incredibly inefficient. Why 
>> not have icons instantiated when you view them, through the .data() 
>> member of your model, and optionally cache them yourself where necessary?
>>
>> 512 x 512 x 8 bits x 4 color channels x 50,000 images comes to 419 gb of 
>> memory utilisation, unless some of your images are the same.
>>
>> What’s wrong with this picture?
>>
> That would be gigaBITS ;-) . Also jpegs are 3 channel usually. So it would 
> be more like:
>   512x512x(8x3)/8 =  ~39GB of uncompressed image data. But it would 
> probably end up mostly going into swap memory. If you don't run out of 
> virtual memory and you aren't swapping too hard then your program could 
> function. It would then depend on how much of that data Qt wants to load 
> active at once. 
>
> That suggestion you made of implementing data() on the model, loading on 
> demand, and caching a realistic max number at a time, seems like it would 
> work great to solve this problem. 
>
>
> ​
>>
>> -- 
>> You received this message because you are subscribed to the Google Groups 
>> "Python Programming for Autodesk Maya" group.
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>>  
>> 
>> .
>> For more options, visit https://groups.google.com/d/optout.
>>
>

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Re: [Maya-Python] Fast way to create QIcon in PySide2?

[Justin Israel]

On Tue, May 23, 2017, 3:42 AM Marcus Ottosson 
wrote:

> Loading 50k jpegs at 512x512 at ~1 second?
>
> It sounds like Qt 4 was deferring the actual load of these files until you
> viewed them, whereas Qt 5 is loading them into memory. Not impossible,
> could be an optimisation on their part.
>
> But why on earth would you do this? :O Sounds incredibly inefficient. Why
> not have icons instantiated when you view them, through the .data()
> member of your model, and optionally cache them yourself where necessary?
>
> 512 x 512 x 8 bits x 4 color channels x 50,000 images comes to 419 gb of
> memory utilisation, unless some of your images are the same.
>
> What’s wrong with this picture?
>
That would be gigaBITS ;-) . Also jpegs are 3 channel usually. So it would
be more like:
  512x512x(8x3)/8 =  ~39GB of uncompressed image data. But it would
probably end up mostly going into swap memory. If you don't run out of
virtual memory and you aren't swapping too hard then your program could
function. It would then depend on how much of that data Qt wants to load
active at once.

That suggestion you made of implementing data() on the model, loading on
demand, and caching a realistic max number at a time, seems like it would
work great to solve this problem.


​
>
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> .
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Re: [Maya-Python] Fast way to create QIcon in PySide2?

[Marcus Ottosson]

Loading 50k jpegs at 512x512 at ~1 second?

It sounds like Qt 4 was deferring the actual load of these files until you
viewed them, whereas Qt 5 is loading them into memory. Not impossible,
could be an optimisation on their part.

But why on earth would you do this? :O Sounds incredibly inefficient. Why
not have icons instantiated when you view them, through the .data() member
of your model, and optionally cache them yourself where necessary?

512 x 512 x 8 bits x 4 color channels x 50,000 images comes to 419 gb of
memory utilisation, unless some of your images are the same.

What’s wrong with this picture?
​

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Re: [Maya-Python] Fast way to create QIcon in PySide2?

[Michael and Amanda]

Thanks for the replies. I should have been more clear. What I'm doing that
takes the time is instantiating 50k QIcons using file paths to 50k jpegs,
each 512x512 pixels. Creating items, telling the icons what size I want
them to display, adding them to my QStandardItemModel and displaying them
in my view is still fast. I run the same code in Maya 2016 and 2017.

I'm at home now but I'll try to be more specific tomorrow.

On 22 May 2017 9:42 PM, "Justin Israel"  wrote:

>
>
> On Mon, May 22, 2017, 8:10 PM Michael Boon  wrote:
>
>> Hey all,
>>
>> I've just discovered that QIcon is really slow to create in Maya 2017.
>> I'm creating what is essentially a file browser, and my old version had a
>> QStandardItemModel, a QListView with 
>> setViewModel(QtWidgets.QListView.IconMode)
>> and about 50,000 icons. Creating the icons used to take ~1 second and
>> now takes ~5 minutes.
>>
>
> Are they actually 50k discreet source images, or is it 50k items in your
> model which make use of a smaller collection of icons?
>
> Do you make any use of reusing the same QIcon for the same source file or
> is a new instance created per item for the same file each time? If you know
> all your icons up front, you can create the set of them up front. Or you
> can use a cache to create them once as needed and retrieved from the cache
> on subsequent needs.
>
> If nothing has changed in your own code between Qt4 and Qt5, maybe there
> is a difference in how they implicitly cache images for you.
>
>
>> Has anyone else found this? Does anyone know a way around it? Or has
>> anyone else found that they can create QIcons fast?
>>
>> Thanks!
>>
>> Boon
>>
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Re: [Maya-Python] Fast way to create QIcon in PySide2?

[Justin Israel]

On Mon, May 22, 2017, 8:10 PM Michael Boon  wrote:

> Hey all,
>
> I've just discovered that QIcon is really slow to create in Maya 2017. I'm
> creating what is essentially a file browser, and my old version had a
> QStandardItemModel, a QListView with 
> setViewModel(QtWidgets.QListView.IconMode)
> and about 50,000 icons. Creating the icons used to take ~1 second and now
> takes ~5 minutes.
>

Are they actually 50k discreet source images, or is it 50k items in your
model which make use of a smaller collection of icons?

Do you make any use of reusing the same QIcon for the same source file or
is a new instance created per item for the same file each time? If you know
all your icons up front, you can create the set of them up front. Or you
can use a cache to create them once as needed and retrieved from the cache
on subsequent needs.

If nothing has changed in your own code between Qt4 and Qt5, maybe there is
a difference in how they implicitly cache images for you.


> Has anyone else found this? Does anyone know a way around it? Or has
> anyone else found that they can create QIcons fast?
>
> Thanks!
>
> Boon
>
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Re: [Maya-Python] Fast way to create QIcon in PySide2?

[Marcus Ottosson]

How do you mean creating the icons? Could the icons not be created as they
are shown, or are you showing 50,000 items all at once? Also what is the
content of your icons, are they .png files, fetched from the web etc.?

Overall though, it sounds like something that qualifies as a Qt 4 vs 5
question, alternatively PySide vs PySide2. You might be able to get help on
Stackoverflow or the like.

On 22 May 2017 at 09:10, Michael Boon  wrote:

> Hey all,
>
> I've just discovered that QIcon is really slow to create in Maya 2017. I'm
> creating what is essentially a file browser, and my old version had a
> QStandardItemModel, a QListView with 
> setViewModel(QtWidgets.QListView.IconMode)
> and about 50,000 icons. Creating the icons used to take ~1 second and now
> takes ~5 minutes.
>
> Has anyone else found this? Does anyone know a way around it? Or has
> anyone else found that they can create QIcons fast?
>
> Thanks!
>
> Boon
>
> --
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> .
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[Maya-Python] Fast way to create QIcon in PySide2?

[Michael Boon]

Hey all,

I've just discovered that QIcon is really slow to create in Maya 2017. I'm 
creating what is essentially a file browser, and my old version had a 
QStandardItemModel, a QListView with setViewModel(QtWidgets.QListView.IconMode) 
and about 50,000 icons. Creating the icons used to take ~1 second and now 
takes ~5 minutes.

Has anyone else found this? Does anyone know a way around it? Or has anyone 
else found that they can create QIcons fast?

Thanks!

Boon

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