Re: How to correctly add a branch to a saved TTree?

Hi,

I am using 5.22/00. I have that version compiled with gcc on a 32 bits machine and the same version compiled with icc on a 64 bits machine. I get the same errors on both machines. As I said it works with a few thousand entries but fails with about 500 000 entries (like if it was failing when using multiple baskets?)

The error messages are the following:
Error in <TObjArray::AddAt>: index 10 out of bounds (size: 10, this: 0x09ce4fd0)
Error in <TObjArray::AddAt>: index 10 out of bounds (size: 10, this: 0x09ce4fd0)
Error in <TObjArray::AddAt>: index 10 out of bounds (size: 10, this: 0x09ce4fd0)
Error in <TObjArray::AddAt>: index 10 out of bounds (size: 10, this: 0x09ce4fd0)

...
...(thousands of lines of the same error)
...

• Break *** segmentation violation (no debugging symbols found) Using host libthread_db library "/lib/tls/libthread_db.so.1". Attaching to program: /proc/8235/exe, process 8235 (no debugging symbols found)...done. [Thread debugging using libthread_db enabled] [New Thread -1218575712 (LWP 8235)] 0x0146a4de in __waitpid_nocancel () from /lib/tls/libc.so.6 Thread 1 (Thread -1218575712 (LWP 8235)): #0 0x0146a4de in __waitpid_nocancel () from /lib/tls/libc.so.6 #1 0x013ff1c4 in do_system () from /lib/tls/libc.so.6 #2 0x008f1d7f in system () from /lib/tls/libpthread.so.0 ...

Thanks!
Pierre-Luc

Philippe Canal wrote:
> Hi Pierre-Luc,
>
> I do not see any problem with this code, nor can I reproduce any issue.
>
> How does it fail in your case? Which version of ROOT are you using?
>
> Cheers,
> Philippe.
>
> Pierre-Luc Drouin wrote:
>> Hi,
>>
>> I am trying to add and fill a branch to an existing TTree and I get a
>> segmentation violation error when the number of entries exceeds some
>> value
>>
>> Here is some code to reproduce the problem:
>> {
>> Int_t nentries=500000;
>> TFile *file=new TFile("file.root","recreate");
>> TTree *tree=new TTree("tree","tree");
>> Float_t val=0;
>> tree->Branch("br1",&val,"br1/F");
>>
>> for(Int_t i=0; i<nentries; ++i) {
>> val=i;
>> tree->Fill();
>> }
>>
>> file->Write();
>> file->Close();
>> delete file;
>>
>> file=new TFile("file.root","update");
>> tree=(TTree*)file->Get("tree");
>> TBranch *br=tree->Branch("br2",&val,"br2/F");
>>
>> for(Int_t i=0; i<nentries; ++i) {
>> val=i;
>> br->Fill();
>> }
>> tree->SetEntries(br->GetEntries());
>>
>> file->Write();
>> file->Close();
>> delete file;
>>
>> file=new TFile("file.root","read");
>> tree=(TTree*)file->Get("tree");
>> tree->Draw("br1");
>> }
>>
>> The code above works correctly when nentries is 25000 but fails with
>> 500000.
>>
>> How can I fix this problem?
>>
>> Thank you!
>> Pierre-Luc Drouin
>>
>
Received on Sun Jun 21 2009 - 05:11:54 CEST