Re: TFile memory leak?

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

>> 

>