Hi Frank, The macro $ROOTSYS/tutorials/hadd.C was designed to merge a few files, not thousands. The way the macro works implies that all the files must be simulateneously open and this should be changed. Meanwhile, I suggest you use a 2 steps procedure, merging only a few hundred files in one go. Rene Brun Frank Filthaut wrote: > > Dear ROOTers, > > I've been happily using the hadd.C macro to merge histogram files. > However, now I have a specific case where I'd like to merge some > 800 files. This fails with the message "... Too many open files". > > What is the limit? How can I see that? And what can I do about > this without having to split up this procedure in several steps? > Many thanks. > Regards, > Frank > > ----------------------------------------------------------- > F. Filthaut > University of Nijmegen, Dept. of Exptl. High Energy Physics > Toernooiveld 1 | Phone: +31-24 365 23 08 > 6525 ED Nijmegen | Fax: +31-24 365 21 91 > The Netherlands | FNAL: +1-630 840 21 77
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