Hi Again,
I've narrowed down the problem a little more.
Yes, my PATH and LD_LIBRARY_PATH variables point to the new version. I
never used the TTree::MakeCode in 3.02/07 to create my analysis code, but
it does appear when I use it in 3.02/07.
Below is the short bit of code from my h3333.C that generates a
segmentation fault in 3.02/07 when it is first run. The interpreter
recovers, and when it is run again, it takes a long time to go through the
50K events in the root file. The ROOT version 3.01/06 has no problem
running this.
(I loaded libPhysics.so at the beginning of the code.)
// This is the loop skeleton
TH1F *hmj = new TH1F("hmj", "muon-jet separation", 100, 0, 10);
Int_t nentries = h3333->GetEntries();
for (Int_t i=0; i<nentries;i++) {
h3333->GetEntry(i);
for (Int_t ii=0 ; ii<Npart ; ii++) {
if ( TMath::Abs(Kfpar[ii]) == 13 ) {
TVector3 p_muon(Pxpar[ii], Pypar[ii], Pzpar[ii]);
for ( Int_t iii=0 ; iii<Njeta ; iii++) {
Double_t rap_muon;
rap_muon=p_muon.Eta();
hmj -> Fill(rap_muon);
}
}
}
}
I've just had a thought on this. Looking in TVector3.h, the constructor
looks like:
TVector3(Double_t x = 0.0, Double_t y = 0.0, Double_t z = 0.0);
The variables Pxpar[ii], etc, are of type Float_t. Is this the problem? I
can't find anywhere that tells me either that ROOT does an implicit
conversion, or how to do a conversion explicitly between these data types,
so I can't check it myself.
Thanks,
-Kalen
On Tue, 22 Jan 2002, Rene Brun wrote:
> Hi Kalen,
>
> I tried converting an old ATLFAST ntuple file into a ROOT file via h2root.
> I generated the analysis code with TTree::MakeCode. 3.02/07 is slightly faster
> than 3.01/06.
> When you moved to 3.02/07, are you sure that you also changed your PATH
> and LD_LIBRARY_PATH variables to point to the new version?
>
> When you execute TTree::MakeCode, you should have received the following
> warning message:
>
> h3333.MakeCode("h3333.C")
> Warning in <TTree::MakeCode>: MakeCode is obsolete. Use MakeClass or
> MakeSelector instead
>
> Did you modify the generated code? Did you activate/deactivate some branches?
>
> Rene Brun
>
> Kalen Martens wrote:
> >
> > Dear ROOTers,
> >
> > I was using ROOT version 3.01/06 for some time. Using h2root, I converted
> > a 50K event ntuple made with ATLFAST into a .root file. I used the
> > TTree::MakeCode() method on the root file and created my script which
> > took about 30 seconds to run with version 3.01/06.
> >
> > I downloaded and installed the binary version 3.02/07. That exact same
> > script now took 10 minutes to run! Another side effect (related, perhaps)
> > is that a segmentation fault occurs when I run this script for the first
> > time after starting ROOT. The segmentation fault is non-fatal and the
> > interpreter recovers.
> >
> > I can't figure out where the speed is lost and why the segmentation fault
> > occurs. Maybe it's a backwards non-compatability? Any idea would be
> > appreciated.
> >
> > I'm back using 3.01/06 for now.
> >
> > Thanks,
> > -Kalen
> >
> > -----------------------------------------------------------------
> > - Kalen Martens Ph:(416)-978-6632 -
> > - Dept. of Physics -
> > - University of Toronto, Toronto, Canada -
> > -----------------------------------------------------------------
>
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