Christian: the whole point of TChain is to allow processing of the data volumes above 2 GBytes. TChain doesnt' merge the files physically - it is a list of files, so 2 GByte limit doesnt' exist for it. The bottom line: either TChain::Merge or TChain::Add will do. - best, Pasha Christian Schmitt wrote: > > Hi ROOTers, > > I have the following problem: I need to merge several hundred files, each > containing the same tree. The total size is something like 10 GB. > So I cannot use just TChain::Merge because of the 2GB limit of root-files. > > Now my wuestion is: how can I merge the files such that ideally I get 5 to 6 > files with each having a filesize < 2GB ? > > It should be a solution which works in general, i.e. doesn't make an > asumption on the structure of the tree in the files (the only thing known is > that the trees are simple trees, i.e. only integers, or floats are stored). > > Thanks for your help, > > Christian Schmitt
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