Re: speed of qt terminal

[Tatsuro M. <tma...@ya...>]

----- Original Message -----

> ----- 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
> 
> If QT_GRAPHICSSYSTEM is set to native, qt terminal is incredibly slow.
> 
> Windows 7 64 bit Qt 5.4.2, Intel HD Graphics 
> 
> Test on Ubuntu reported afterwards.
> 
> Tatsuro
> 

Ubuntu 14.04 (LTS) amd64, Qt 4.8.5, nvidia-304

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.

Tatsuro