The following does not work on ROOT 6.10/04; why?
auto data = w.pdf("pdf")->generate(*w.var("x"),100000);
auto nll = (RooNLLVar *)w.pdf("pdf")->createNLL(*data, RooFit::NumCPU(4, 3), RooFit::Optimize(2), RooFit::Offset(true));
This looks like a bug and it would be nice if you can open a JIRA ticket.
I have seen the crash is happening only when using strategy=3 in NumCPU.
All other strategies work fine
In your simple example you don’t need strategy =3
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