Re: Fatal in <operator delete>: storage area overwritten

Rene Brun (Rene.Brun@cern.ch)
Tue, 14 Oct 1997 08:36:57 +0200

Your program seems to be correct. I have simulated this trivial
structure in the short macro below. Could you run this macro and let
me know if is OK.
If yes, then, I suggest that you write an ascii file with your data
and modify my macro below to read from your ascii file instead
of getting random numbers.
If reading from the ascii file is OK, look then into your
unidaq.get_record
function for a possible overwrite, otherwise contact me directly.

Rene Brun

//____________________macro William.C____________________
{
gROOT->Reset();
TFile *f = new TFile("wil.root","RECREATE");
TNtuple *ntuple = new TNtuple("ntuple","data from Unidaq file",
"p_time:nwires:time:chamber:mpx_peak:x:y:isVert");

Float_t p_time,x,y;
Float_t nwires,time,chamber,peak,isVert;
for (Int_t i=0;i<10000;i++) {
p_time = gRandom->Rndm();
nwires = 100*gRandom->Rndm();
time = 100*gRandom->Rndm();
chamber = 10*gRandom->Rndm();
peak = 1000*gRandom->Rndm();
x = 100*gRandom->Gaus(0,2);
y = 100*gRandom->Gaus(5,1);
isVert = 100*gRandom->Rndm();
ntuple->Fill(p_time,
nwires,
time,
chamber,
peak,
x,
y,
isVert);
}
f->Write();
}
//_________________end of macro

William J. Deninger wrote:
>
> Hello,
>
> I have a TObject class called BOOK which creates an TNuple and TFile and
> Fills data into the ntuple, but seems to generate a run-time error when
> the ntuple fill routine is called too often (exactly 7982 times with
> this ntuple regardless of data), it crashes my WinNT root!
> .
> // code segment
> void BOOK::Run()
> {
> TFile *f = new TFile("d:\\data\\basic.root","RECREATE");
> TNtuple *ntuple = new TNtuple("ntuple","data from Unidaq file",
> "p_time:nwires:time:chamber:mpx_peak:x:y:isVert");
> unsigned int calls = 0;
> // big loop over unidaq data
> while(unidaq.get_record())
> {
> cout << "record " << unidaq.record() << endl;
> ....
> ....
> // booking ntuple
> for (unsigned int i=0; i<mpx.hit.size_wires; i++)
> {
> calls ++; // bombs Root on 7982 nd call regardless of data.
> ntuple->Fill(mpx.hit.p_time, mpx.hit.size_wires,
> (mpx.hit.wires[i].time_1 + mpx.hit.wires[i].time_2)/2.0,
> mpx.hit.wires[i].wi.Chamber(),
> mpx.hit.wires[i].mpx_peak,
> mpx.hit.wires[i].wi.Wire_x(),
> mpx.hit.wires[i].wi.Wire_y(),
> mpx.hit.wires[i].wi.Iswirevert() );
> }
> }
> f->Write();
> }
>
> //
> //
> root[0] BOOK b;
> root[1] b.Run();
> record 1
> ..
> ..
> record 779
> record 780
> record 781
> record 782
> Fatal in <operator delete>: storage area overwritten
> aborting
> Warning in <TClass::TClass>: no dictionary for class TWinNTSystem
> available
> Warning in <TWinNTSystem::StackTrace>: this method must be overridden!
>
> Any suggestions??
>
> William J. Deninger