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The most systematic approach to controlling the output of RooFit is accessing the streams of the message service directly. The first thing is to check the instance of the RooMsgService:
RooMsgService::instance().Print() ;
This will tell you which streams exist and what they comprise. You can then access the stream and remove a certain topic:
RooMsgService::instance().getStream(1).removeTopic(RooFit::Eval);
The topics are:
RooFit::Eval RooFit::Generation RooFit::Minimization RooFit::Plotting RooFit::Fitting RooFit::Integration RooFit::LinkStateMgmt RooFit::Caching RooFit::Optimization RooFit::ObjectHandling RooFit::InputArguments RooFit::Tracing RooFit::Contents RooFit::DataHandling RooFit::NumIntegration RooFit::Eval