Too big RooFit output

Hi,
I am running some ToyMCstudies over the grid using RooFit

From time to time it happens that my output gets gigantic >10 GByte and fill up the local disk. (and I get a complaint from the grid people, of course)
Unfortunately I cannot easily understand what is causing the problem since it happens just a few % of the times, an NEVER when I run interactively on my local computer.

Last time It happened the last printing was:

RooGenericPdf::pdf_sig_omegaCnnet_tagCat0[ actualVars=(sig_par0_tagCat0,sig_par1_tagCat0,nnet_tagCat0,tag_tagCat0,sig_net_m_tagCat0) ] = 0
RooGenericPdf::pdf_sig_omegaCnnet_tagCat0[ actualVars=(sig_par0_tagCat0,sig_par1_tagCat0,nnet_tagCat0,tag_tagCat0,sig_net_m_tagCat0) ] = 0
RooGenericPdf::pdf_sig_omegaCnnet_tagCat0[ actualVars=(sig_par0_tagCat0,sig_par1_tagCat0,nnet_tagCat0,tag_tagCat0,sig_net_m_tagCat0) ] = 0

which doesn’t tell me too much…

I wonder if there is a way to tell RooFit to write less … in case it gets “crazy”

Thanks for any help
Stefania