|Message: Re: CreateNtuple in multithreaded exMPI03||Not Logged In (login)|
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In the exMPI03 example, a file is open only before saving histograms,
see Analysis::Save() function.
If you want to use ntuples, a file has to be open before you fill an ntuple; when you create an ntuple before opening a file, the analysis manager saves the ntuple definition in an "ntuple booking" object and creates the" ntuple" object only when a file is defined in OpenFile() call.
In difference from histograms, the ntuples produced on threads (and the ranks when using MPI) are not merged in a single file, so to use the ntuples with the exMPI03 example, you need to add opening a file with a filename specific per rank in "begin of run action" and remove it from Analysis::Save() function.
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