Hi Diego,
What do you mean the result are the same? Did you try a second serie
of open/close in the same process?
I am expecting a memory increase after the first you open/close the file
(due to one time initialization).
However on the second time they should be no memory increase.
Philippe
-----Original Message-----
From: Diego Faso [mailto:faso@to.infn.it]
Sent: Friday, April 09, 2004 3:45 AM
To: Philippe Canal
Cc: roottalk@cern.ch
Subject: RE: [ROOT] memory problem (TFile)
Hi. I tried, but the result is the same. I also tried to close the file
with the "R" option, but the situation is the same...
Could it be a problem in the TFile class?
Cheers
Diego
On Thu, 8 Apr 2004, Philippe Canal wrote:
> Hi,
>
> Instead of
> TFile f1 = TFile("trees.root")
> you should use
> TFile *f1 = new TFile("trees.root");
> Instead of
> t->Delete();
> use
> delete t;
> In addition to
> f1->Close();
> use
> f1->Close();
> delete f1;
>
> Also note that there is a fair amount of one-time initialization, loading,
> creating that can happen the first time (in a process) you use one of ROOT
> facility. You should actually compare the result __after__ the first
time.
>
> I.e.
> (low amount of memory being used)
> TFile *f1 = new TFile("trees.root");
> TTree *t = (TTree *) f1.Get("h127")
> delete f1;
> gROOT->Reset();
> (some higher amount of memory being used)
> TFile *f1 = new TFile("trees.root");
> TTree *t = (TTree *) f1.Get("h127")
> delete f1;
> gROOT->Reset();
> (SAME amount of memory being used.)
>
> Cheers,
> Philippe.
>
> -----Original Message-----
> From: owner-roottalk@pcroot.cern.ch
> [mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Diego Faso
> Sent: Thursday, April 08, 2004 9:54 AM
> To: roottalk@cern.ch
> Subject: [ROOT] memory problem (TFile)
>
>
> Good afternoon. I need to open, read and close several root files in a
> 'for loop'.
> I encountered a problem of memory allocation: the memory allocated for the
> 'root' process does not decrease when I close the file
>
> Here is an example:
> -------------------------------------------
> (prompt)# root
> (root process memory = 33908)
>
> root [0] TFile f1 = TFile("trees.root")
> (root process memory = 35552)
>
> root [1] TTree *t = (TTree *) f1.Get("h127")
> (root process memory = 37492)
>
> root [2] t->Delete()
> (root process memory = 37492)
>
> root [3] f1.Close()
> (root process memory = 37492)
>
> root [4] gROOT->Reset()
> (root process memory = 37496)
> -------------------------------------------
>
> How can I solve this problem?
>
> My machine is:
>
> - Linux red hat 9.0
> - gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
> - root version 4.00/02
> (I noticed the same problem for the root version 3.10.02)
>
>
> Cheers
> Diego Faso
>
>
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