Re: backend('fltk') use large amount CPU resources on MinGW

[Tatsuro MATSUOKA]

Hello

I have carried out dbstep trace.

octave:2> backend('fltk')
stopped in C:\Programs\OctaveBuild\share\octave\3.3.54+\m\plot\backend.m at 
line 33
33:   name = "";
debug> dbstep
stopped in C:\Programs\OctaveBuild\share\octave\3.3.54+\m\plot\backend.m at 
line 34
34:   hlist = [];
debug> dbstep
stopped in C:\Programs\OctaveBuild\share\octave\3.3.54+\m\plot\backend.m at 
line 36
36:   if (nargin == 1)
debug> dbstep
stopped in C:\Programs\OctaveBuild\share\octave\3.3.54+\m\plot\backend.m at 
line 36
36:   if (nargin == 1)
debug> dbstep
stopped in C:\Programs\OctaveBuild\share\octave\3.3.54+\m\plot\backend.m at 
line 37
37:     if (ischar (varargin{1}))
debug> dbstep
stopped in C:\Programs\OctaveBuild\share\octave\3.3.54+\m\plot\backend.m at 
line 37
37:     if (ischar (varargin{1}))
debug> dbstep
stopped in C:\Programs\OctaveBuild\share\octave\3.3.54+\m\plot\backend.m at 
line 38
38:       name = varargin{1};
debug> dbstep
stopped in C:\Programs\OctaveBuild\share\octave\3.3.54+\m\plot\backend.m at 
line 55
55:   if (! any (strcmp (available_backends (), name)))
debug> dbstep
stopped in C:\Programs\OctaveBuild\share\octave\3.3.54+\m\plot\backend.m at 
line 55
55:   if (! any (strcmp (available_backends (), name)))
debug> dbstep
stopped in C:\Programs\OctaveBuild\share\octave\3.3.54+\m\plot\backend.m at 
line 56
56:     feval (["__init_", name, "__"]);
debug> name
name = fltk

>From feval (["__init_", name, "__"]);, the not small amount of CPU resources 
>are used.

Regards

Tatsuro   
--- Tatsuro MATSUOKA  wrote:

> Hello
> 
> When I execute
> 
> >>backend('fltk')
> 
> the amount 55-80 % CPU resources are used on my old computer (Win XP 
> Celeron-M 1.2 GHz) on
> recent
> development source.  The platform is Windows
> 
> The above happens even if no plot was carried out.
> 
> I cannot
> Of course, for recent powerful computers this is not so serious.
> However, considering of use of netbook, this might not be desirable.
> 
> Why only the backend('fltk') (without plots) command use large amount of the 
> CPU resources?
> Is this specific to the windows.
> 
> Octave 3.2.4 has an experimental version fltk backend.  In the case,
> 
> >>backend('fltk')
> 
> does not use so much CPU resources.
> 
> Anyway I will look into this using debug facilities of the octave.
> 
> If someone give me suggestions, it will be grateful.
> 
> Regards
> 
> Tatsuro
>  
> 
> 
> 
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