Re: TFile memory leak?

Hello all,

Here is a minimum example. You don't need to download http://slac.stanford.edu/~oxon/tmp.tgz

#include <TFile.h>
#include <TCanvas.h>
#include <TH2D.h>
#include <iostream>

int main(int argc, char** argv)
{
  TCanvas can("can", "can");
  TH2D h("h", "h", 100, -3, 3, 100, -3, 3);   h.FillRandom("gaus", 100000);
  h.Draw("col");
  can.SaveAs("tmp.root");

  const Int_t kN = 10000;
  for(Int_t i = 0; i < kN; i++){
    TFile f("tmp.root");
    std::cout << "Reading " << f.GetName() << "...\n";     TCanvas* c = (TCanvas*)f.Get("can");     f.Close();
  } // i

  return 0;
}

I would like to know how to delete the allocated memory to TCanvas* c. C++'s delete does not work.

Regards,

--
OKUMURA, Akira oxon@{astro.isas.jaxa.jp,stanford.edu}
Institute of Space and Astronautical Science (ISAS/JAXA)
Now at KIPAC/SLAC/Stanford
Varian Physics #306
382 Via Pueblo Mall, MC 406 Stanford, CA94305
TEL 650-736-0971/FAX 650-724-5065
Skype : okumura.akira

On 2010/09/09, at 8:20, OKUMURA, Akira wrote:



> Hello John and all,

> 

> I uploaded the log file here.

> http://slac.stanford.edu/~oxon/valgrind.log

> 

> Regards,

> 

> --

> OKUMURA, Akira oxon@{astro.isas.jaxa.jp,stanford.edu}

> Institute of Space and Astronautical Science (ISAS/JAXA)

> Now at KIPAC/SLAC/Stanford

> Varian Physics #306

> 382 Via Pueblo Mall, MC 406 Stanford, CA94305

> TEL 650-736-0971/FAX 650-724-5065

> Skype : okumura.akira

> 

> On 2010/09/09, at 2:06, John Idarraga wrote:

> 

>> Hello Akira
>> 
>> Can you &> that to a log file and send it ?
>> 
>> John
>> 
>> OKUMURA, Akira wrote:
>>> Hello Claudi and all,
>>> 
>>> Thank you for your advice. I attach a part of the valgrind output. Even though this is a first time to use valgrind for me, the output seems that there is memory leak.
>>> 
>>> ==17737== 5,189,819 (27,328 direct, 5,162,491 indirect) bytes in 61 blocks are definitely lost in loss record 45,809 of 45,811
>>> ==17737==    at 0x1000146CE: operator new(unsigned long) (vg_replace_malloc.c:261)
>>> ==17737==    by 0x1000386C9: TStorage::ObjectAlloc(unsigned long) (in /usr/local/root_svn/lib/libCore.so)
>>> ==17737==    by 0x100233BB4: TObject::operator new(unsigned long) (in /usr/local/root_svn/lib/libCore.so)
>>> ==17737==    by 0x102DE6955: ROOT::new_TPaletteAxis(void*) (in /usr/local/root_svn/lib/libHistPainter.so)
>>> ==17737==    by 0x10010AAA5: TClass::New(TClass::ENewType) const (in /usr/local/root_svn/lib/libCore.so)
>>> ==17737==    by 0x100FEB2BF: TBufferFile::ReadObjectAny(TClass const*) (in /usr/local/root_svn/lib/libRIO.so)
>>> ==17737==    by 0x1000EF390: TBuffer& operator>><TObject>(TBuffer&, TObject*&) (in /usr/local/root_svn/lib/libCore.so)
>>> ==17737==    by 0x1000F2C22: TList::Streamer(TBuffer&) (in /usr/local/root_svn/lib/libCore.so)
>>> ==17737==    by 0x100FE8A18: TBufferFile::ReadFastArray(void**, TClass const*, int, bool, TMemberStreamer*, TClass const*) (in /usr/local/root_svn/lib/libRIO.so)
>>> ==17737==    by 0x1010A1864: int TStreamerInfo::ReadBuffer<char**>(TBuffer&, char** const&, int, int, int, int) (in /usr/local/root_svn/lib/libRIO.so)
>>> ==17737==    by 0x100FE9C15: TBufferFile::ReadClassBuffer(TClass const*, void*, int, unsigned int, unsigned int, TClass const*) (in /usr/local/root_svn/lib/libRIO.so)
>>> ==17737==    by 0x101363C23: TH1::Streamer(TBuffer&) (in /usr/local/root_svn/lib/libHist.so)
>>> ==17737== ==17737== 69,739,543 (823,176 direct, 68,916,367 indirect) bytes in 999 blocks are definitely lost in loss record 45,810 of 45,811
>>> ==17737==    at 0x1000146CE: operator new(unsigned long) (vg_replace_malloc.c:261)
>>> ==17737==    by 0x1000386C9: TStorage::ObjectAlloc(unsigned long) (in /usr/local/root_svn/lib/libCore.so)
>>> ==17737==    by 0x100233BB4: TObject::operator new(unsigned long) (in /usr/local/root_svn/lib/libCore.so)
>>> ==17737==    by 0x101A9EA7E: ROOT::new_TCanvas(void*) (in /usr/local/root_svn/lib/libGpad.so)
>>> ==17737==    by 0x10010AAA5: TClass::New(TClass::ENewType) const (in /usr/local/root_svn/lib/libCore.so)
>>> ==17737==    by 0x101013FBB: TKey::ReadObj() (in /usr/local/root_svn/lib/libRIO.so)
>>> ==17737==    by 0x100FF5AEE: TDirectoryFile::Get(char const*) (in /usr/local/root_svn/lib/libRIO.so)
>>> ==17737==    by 0x100000EFC: main (test.C:19)
>>> ==17737== ==17737== LEAK SUMMARY:
>>> ==17737==    definitely lost: 859,176 bytes in 1,222 blocks
>>> ==17737==    indirectly lost: 85,444,368 bytes in 14,771 blocks
>>> ==17737==      possibly lost: 387,824 bytes in 1,534 blocks
>>> ==17737==    still reachable: 9,549,367 bytes in 84,421 blocks
>>> ==17737==         suppressed: 852,204 bytes in 23,733 blocks
>>> ==17737== Reachable blocks (those to which a pointer was found) are not shown.
>>> ==17737== To see them, rerun with: --leak-check=full --show-reachable=yes
>>> ==17737== ==17737== For counts of detected and suppressed errors, rerun with: -v
>>> ==17737== Use --track-origins=yes to see where uninitialised values come from
>>> ==17737== ERROR SUMMARY: 705 errors from 705 contexts (suppressed: 1692 from 1692)
>>> 
>>> Regards,
>>> 
>>> --
>>> OKUMURA, Akira oxon@{astro.isas.jaxa.jp,stanford.edu}
>>> Institute of Space and Astronautical Science (ISAS/JAXA)
>>> Now at KIPAC/SLAC/Stanford
>>> Varian Physics #306
>>> 382 Via Pueblo Mall, MC 406 Stanford, CA94305
>>> TEL 650-736-0971/FAX 650-724-5065
>>> Skype : okumura.akira
>>> 
>>> 
>>> On 2010/09/08, at 14:31, Claudi Astres wrote:
>>> 
>>> 
>>>> Hi Akira,
>>>> You could use "valgrind" utility to check whether the problem is really a memory leak. Maybe you already knew it.
>>>> Valgrind has become crucial for me: http://valgrind.org/
>>>> 
>>>> Regards.
>>>> Claudi
>>>> 
>>>> 
>>>> El 08/09/2010, a las 22:14, OKUMURA, Akira escribió:
>>>> 
>>>> 
>>>>> Hello ROOTers,
>>>>> 
>>>>> This question may be a very basic one but I could not find similar questions on the web.
>>>>> 
>>>>> http://slac.stanford.edu/~oxon/tmp.tgz
>>>>> 
>>>>> This tgz file includes a .root file and a very simple script which opens TFile 10000 times. When I execute the script,
>>>>> 
>>>>> root [0] .x test.C
>>>>> 
>>>>> the memory usage of the process becomes more than 1 GB while all TFile instances are closed.
>>>>> 
>>>>> The .root file was created via TPad::SaveAs, as follows.
>>>>> 
>>>>> root [0] TCanvas can("can", "can")
>>>>> root [1] TH2D* h = new TH2D("h", "h", 100, -3, 3, 100, -3, 3)
>>>>> root [2] h->FillRandom("gaus", 1000000)
>>>>> root [3] h->Draw()
>>>>> root [4] can.SaveAs("aho.root")
>>>>> 
>>>>> How can I suppress this large memory consumption? I am not sure if this is an intended behavior or memory leak.
>>>>> 
>>>>> I am using svn trunk on Snow Leopard and SL 5.
>>>>> 
>>>>> Regards,
>>>>> 
>>>>> --
>>>>> OKUMURA, Akira oxon@{astro.isas.jaxa.jp,stanford.edu}
>>>>> Institute of Space and Astronautical Science (ISAS/JAXA)
>>>>> Now at KIPAC/SLAC/Stanford
>>>>> Varian Physics #306
>>>>> 382 Via Pueblo Mall, MC 406 Stanford, CA94305
>>>>> TEL 650-736-0971/FAX 650-724-5065
>>>>> Skype : okumura.akira
>>>>> 
>>>>> 
>>> 
>>> 
>> 


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