St9bad_alloc

ROOT
1

Hello All,

 I am having an interesting problem.  I am using cafe and running some MC files through a processor I wrote.  When I run over 1000, or 2000 events there seems to be no problem.  When I run over 10000 events, I get this error message:

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root [2] TCanvas::MakeDefCanvas: created default TCanvas with name c1
Error in TFile::ReadBuffer: error reading all requested bytes from file testjob.root, got 0 of 3934
Warning in TBasket::ReadBasketBuffers: basket: has fNevBuf=0, but fEntryOffset=0, trying to repair
Error in TBranchElement::GetBasket: File: testjob.root at byte:0, branch:(null), entry:153661564
Error in TFile::ReadBuffer: error reading all requested bytes from file testjob.root, got 0 of 3934
Warning in TBasket::ReadBasketBuffers: basket: has fNevBuf=0, but fEntryOffset=0, trying to repair
Error in TBranchElement::GetBasket: File: testjob.root at byte:0, branch:(null), entry:153661564
terminate called after throwing an instance of ‘std::bad_alloc’
what(): St9bad_alloc

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I will attach my processor code (it isn’t too long) and the root file. I believe the problem is in the part of the code that fills the muonbranch (as I have called it). As I said, it seems to be fine when run over 2000 events.

If any of you would help me with this problem, I would so greatly appreciate it. I am defending a masters in a week using results from this code, and I could really use a friend right now. Thanks so much in advance for your time.

Sincerely,
Evan
testjob.root (113 KB)
MyPartonSelector.cpp (15.2 KB)

2

Your file testjob.root contains the tree header only and not its baskets.
It looks like you saved your baskets buffers to another file and the Tree header to a different file. Here is the result of TFile::Map()

root [0] TFile f("testjob.root"); root [1] f.Map() 20081031/163056 At:100 N=120 TFile 20081031/184735 At:220 N=105430 TTree CX = 2.99 20081031/184735 At:105650 N=311 TH1D CX = 2.22 20081031/184735 At:105961 N=644 TH2F CX = 65.60 20081031/184735 At:106605 N=492 TH1D CX = 34.12 20081031/184735 At:107097 N=539 TH1D CX = 31.23 20081031/184735 At:107636 N=526 KeysList 20081031/184735 At:108162 N=7003 StreamerInfo CX = 3.65 20081031/184735 At:115165 N=56 FreeSegments 20081031/184735 At:115221 N=1 END

Rene

3

Dear Rene,

 Thanks so much for your reply, can you tell me how to implement your advice or point me to a source that can tell me?   Once again, thanks  :slight_smile:

Evan

4

well! my answer was not an advice, just a simple look to your file.
You should look at your program that created this file and check where your baskets were created. I cannot tell you more without looking at your code, but this should be something simple to find yourself.

Rene