With old ROOT versions 3, the maximum file size was 2 GBytes. With ROOT version 4, there is no limit except the one imposed by the OS. With both version 3 and 4, the maximum size for a Tree is 1.9 GByte. With version 4, you can change this limit by calling TTree::SetMaxTreeSize. For more details see TTree::ChangeFile http://root.cern.ch/root/htmldoc/TTree.html#TTree:ChangeFile Rene Brun On Fri, 25 Jun 2004, Stilianos Kesisoglou wrote: > Hi, > > Is there any limit for the size that a ROOT file can have? > I was running a selection macro on a number of files and my macro > terminated normally (i.e without errors) when the size of the output file > reached 1.7 GB. I know that this isn't the end since the original files > have around 600000 events, and I went through only the first 200000. > Can I force ROOT to make multiple output files? > > Thanks, > > Stelios. >
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