On Friday 01 June 2018 14:45:41 fredvs wrote:
> Hello Martin.
>
> I am a little afraid about the resource used by tprogressbar.
>
> Included a simple demo to show it.
> msemem.zip
> <http://mseide-msegui-talk.13964.n8.nabble.com/file/t2/msemem.zip>
>
> The tprogressbar.value is assigned by a timer with a random value:
>
> When rendering the tprogressbar: cpu used = 70 %.
>
I get 2% for msemem and 4% for Xorg, see attachment.
Some optimizations:
"
procedure tmainfo.ontimerwait(const Sender: TObject);
var
i : int32 = 1;
f : float ;
begin
timerwait.Enabled := False; //<<<<not necessary
if tag = 0 then begin
while i < 21 do
begin
f := random(100)/100; //<<<< FPC random is slow
tlabel1.caption := ' Random number = ' + floattostr(f);
if enableview.value = true then
TProgressBar(findcomponent('tprogressbar'+inttostr(i))).value:= f else
//<<<<<<< findcomponent is slow
TProgressBar(findcomponent('tprogressbar'+inttostr(i))).value:= 0;
inc(i);
end;
timerwait.Enabled := true; //<<<<not necessary
end;
end;
"
Removing the fades probably also speeds up things.
> <http://mseide-msegui-talk.13964.n8.nabble.com/file/t2/mse_progressbar_on.p
>ng>
>
> Without rendering the tprogressbar, cpu used = 28 %.
>
> <http://mseide-msegui-talk.13964.n8.nabble.com/file/t2/mse_progressbar_off.
>png>
>
> Is there a other-less-resource-used way to mimic a tprogressbar ?
A tchart with traces[0].chartkind = tck_bar probably is faster because it is a
single widget instead of 20 tprogressbar.
"
procedure tmainfo.timerevent(const sender: TObject);
var
ar1: flo64arty;
i1: int32;
begin
setlength(ar1,20);
for i1:= 0 to high(ar1) do begin
ar1[i1]:= mwcnoise() / flo64($ffffffff);
end;
bar.traces[0].ydata:= ar1;
end;
"
mwcnoise() is from unit msenoise.
> Do you think that drawing on a custom canvas would need less resource ?
>
Probably.
Martin
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