Hi Bram, There is no limitation on the number of files in TChain::Merge. Could you make one single tar file with your 40 files and let me know where I can access it? Rene Brun On Wed, 4 Sep 2002, Bram Wijngaarden wrote: > > Hi, > > Some strange behaviour showed op trying to merge a flat ntuple in root > 3.03/7 (compiled for sgiegcs). I'm trying to merge TNtuples from 40 files. > The final (merged) ntuple has too few entries - about 1700. When I just > merge a subset of 10 of these files the final number of entries is much > larger, about 14k, which makes more sense. This is fully reproducable. The > size of the target files is about 35k for the 1700 entries and 224k for > the 10 files (the size of the source files is about 350kb each which > includes a ton of histograms, so the total tally is well below the default > fgMaxTreeSize of 1.9 Gb). > > Just adding a subset of 1, 2, 3 etc files seems to go fine - at an > increment of about 30kb per file - until I have 15 files merged, for a > file size of 505906 bytes. 16 files give me 505929 bytes. 17 files give me > 505906 again, and so do 18 files. 19 files give me 505917, and then 505906 > comes back. This sort of behaviour goes on ad infinitum. > > Is there a problem with TChain handling a certain number of files? Is > there a problem with the file size? I'm totally stumped. > > Cheers, > Bram > > - > D.A. Wijngaarden Meijhorst 6422 > AiO KUN-EHEF 6537 LE Nijmegen > Experiment: D0 The Netherlands > Work phone: +31 24 365 2099 > Fax: +31 24 365 2191 > "Fuimus" - Robert the Bruce > >
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