On Sun, 24 Jan 1999, Valeriy Onuchin wrote:
> Hi Piotr!
> When you hE->Draw();
> that add pointer to hE to ListOfPrimitieves
> of TPad where you draw ,in your case this is
> TCanvas c.
>
> You should do it only ones , all
> drawing will be done by c->Modified(); c->Update();
> see code below:
>
> hE->Draw();
>
> for (int i=1;i<=1000;i++) {
>
> printf("EVENT %i \n",i);
>
>
> hE->Fill(1);
> c->Modified();
> c->Update();
>
> }
>
> this one of the reason , alhough there are could be others.
>
> With best regards. Valery
>
Thank You!
Of course this colud be the reason, but not the most important one.
The leakage is approximately 160kB/1000 redraws that makes about
0.16kB/redraw = 160 bytes. That is much more than a size of single
pointer! What's more - when I was looking for a reason, I was using a
"hit-or-miss" method: I was commenting out line-after-line to find the one
that causes the leak. It was c->Update(), not hE->Draw(), to be the most
serious one.
BTW, Isn't there a protection in Draw() method for adding an object
another time to a ListOfPrimitives ?
thanks once again!
Piotr
=========================================================================
"We're all born from the Ashes of Stars..."
[ from CERN Summer Students' lectures 1997]
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
"In the world with no walls and fences, who needs windows and gates ..."
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Piotr Golonka
CERN Technical Student 1998/99
e-mail: Piotr.Golonka@cern.ch
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