Hi Rene,
The memory leak is about 800 bytes/iteration. Not much,
but my monitoring program has to continuously generate plots, full time,
so this is unfortunately a problem. I have observed the same effect on
separate machines (my RH6.2 laptop with 3.02./02, and on a 6CPU HP
netserver running RH7.1 with 3.01/06), so it is not some local error (but
one never knows...).
However, if printing gifs instead of eps, this problem dissapears!
Unfortunately I am running in batch mode, so I cannot use this.
Tome
> I cannot reproduce this problem.
> Could you tell me what is the estimated memory leak per iteration ?
>
> About your second question. If you run interactively,
> you can produce a gif file directly by replacing
> c1->Print("xxx.eps");
> by
> c1->Print("xxx.gif");
>
> Rene Brun
>
> On Sat, 3 Nov 2001, Tome Anticic wrote:
>
> >
> > Thanks for the quick reply.
> >
> > Unfortunately, I tried it under root 3.02/02 and the problem persists.
> > gObjectTable->Print() reports no problems however. But the
> > memory usage (using top) keeps increasing on each iteration
> > of the Print() method...
> >
> > Actually, I also have a related question. The reason I
> > print the postscript file is to convert it to gif (via
> > pstopnm and ppmtogif). This is a slowish process, and I
> > was wondering if there is a faster way to get a gif of
> > a canvas?
> >
> > Tome
> >
> >
> > On Fri, 2 Nov 2001, Rene Brun wrote:
> >
> > > Hi Tome,
> > >
> > > This problem has already been fixed.
> > > Move to a more recent version.
> > >
> > > Rene Brun
> > >
> > > Tome Anticic wrote:
> > > >
> > > > Hi,
> > > >
> > > > I would really appreciate if somebody could tell
> > > > me what I am doing wrong.
> > > >
> > > > I need to generate a lot of plots at short intervals.
> > > > So I do a graph in a canvas and use the Print() method
> > > > to print a postscript file . But I noticed that the
> > > > Print() method causes an increasing amount of memory to be
> > > > used. How can I prevent this and free the memory?
> > > > Below is a sample code where
> > > > this can be observed (do top from a shell and watch...)
> > > >
> > > > Any help would be appreciated. I use root 3.00 /egcs 2.91.66
> > > >
> > > > Thanks,
> > > > Tome
> > > >
> > > > void testMemory()
> > > > {
> > > > Float_t X[100];
> > > > Float_t Y[100];
> > > >
> > > > TCanvas *c1;
> > > > c1 = new TCanvas("c1","canvas");
> > > >
> > > > for (Int_t i=0; i< 100;i++) {
> > > > X[i] = i;
> > > > Y[i] = i;
> > > > }
> > > > TGraph* grh = new TGraph(100,X,Y);
> > > > grh->Draw("AL");
> > > >
> > > > while (1) {
> > > > cout << " do plot " << endl;
> > > > c1->Update();
> > > > // this causes memory to be used and NOT freed
> > > > c1->Print("xxx.eps");
> > > > }
> > > > }
> > >
> >
>
--
Tome Anticic
Rudjer Boskovic Institute
Department of Experimental Physics
Bijenicka 54
10000 Zagreb
CROATIA
Phone: 385-1-4561-028
Fax: 385-1-4680-239
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