Using root 3.01-06 on Redhat 6.2 Linux with kernel 2.2.19-6.2.7, but my problem is observed on SunOS also, and disappears with a sufficiently early version of root (e.g. 2.23-12). I am having trouble using TMapFile. I used the example producer from http://root.cern.ch/root/html/examples/hprod.C.html and in the second line it fails: { gROOT->Reset(); mfile = TMapFile::Create("hsimple.map","RECREATE", 100000, "Demo memory mapped file with histograms"); // Script dies here. } The error message: Error in <TMapFile::TMapFile>: no memory mapped file capability available Error in <TMapFile::TMapFile>: mapped file not in mmalloc format or already open in RW mode by another process (To anticipate: I did remove the file "hsimple.map" first.) Interestingly, if I use root 2.23-12 or 2.21-08 the tutorial producer works great, and the tutorial consumer sees the data, etc. So, my question is what might be wrong with my use under 3.01-06 ? (problem also on 3.00-06). It seems unlikely to be a corrupted installation since I tried both my installed version and our computer center's version. Same failure is seen on a SunOS installation. thanks, ------------------------------------------------------ Robert W. Michaels www.jlab.org/~rom phone (757) 269 7410 pager (757) 881 7897 Thomas Jefferson National Accelerator Facility 12000 Jefferson Ave, Newport News, VA 23606 USA
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