Re: speed of qt terminal

[Daniel J S. <dan...@ie...>]

On 06/26/2015 11:04 PM, Tatsuro MATSUOKA wrote:
>
>
> ----- Original Message -----
>> From: Daniel J Sebald
>> To: Tatsuro MATSUOKA
>> Cc: gnuplot-beta
>> Date: 2015/6/27, Sat 09:22
>> Subject: Re: speed of qt terminal
>>>   Daniel.
>>>   Can you show me a short script at which qt terminal is rather slow?
>>>
>>>   I would like to execute it on windows and ubuntu PC.
>>>
>>>   Tatsuro
>>
>> Try something like:
>>
>>    cd '<buildpath>/gnuplot/demo'
>>    set term qt
>>    splot 'blutux.rgb' binary array=(128,128) flipy
>> format='%uchar' using 1:2:3 with rgbimage
>>
>>    [rotate the image using a mouse]
>>
>>    set term x11
>>    replot
>>
>>    [rotate the image using a mouse]
>>
>> If you want, exit, re-launch and try
>>
>>    cd '<buildpath>/gnuplot/demo'
>>    set term wxt
>>    splot 'blutux.rgb' binary array=(128,128) flipy
>> format='%uchar' using 1:2:3 with rgbimage
>>
>> On my system there is a very large difference in redraw speed with Qt. Granted,
>> it could be the data transfer that is slow and rendering is fast, don't
>> know.  Also, on my system, the wxt terminal will show a bad aliasing bug when
>> the image is rotated so that it is orthogonal to the window borders.
>>
>> Dan
>
>
> On windows
>
>
> Qt  very slow
> wxt not slow not fast
> windows fastest

No surprise there, I guess; Windows being the fastest.


> If QT_GRAPHICSSYSTEM is set to native, qt terminal is incredibly slow.

That must be what my system is defaulting to.


> Qt QT_GRAPHICSSYSTEM non-specified a litte bit slow
> QT_GRAPHICSSYSTEM=raster normal almost the same as X11
> QT_GRAPHICSSYSTEM=opengl does not work
> X11 normal
> wxt rather faster than qt and x11
> Perhaps speed of qt on this test depends strongly environments.

Yes, also different from what either Ethan or I have found.

Dan