Cmdstanr reduce sum case study, but: unused argument (threads = TRUE)

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Since I can’t get any speed-up in CmdStanR, it might it be worth trying to replicate the case study in regular CmdStan instead ?

I followed Getting Started with CmdStan, used stan_rdump(names(redcard_data), "redcard.data.R") in RStudio, and then in the terminal:

make ~/Documents/logistic0
make ~/Documents/logistic1
~/Documents/logistic0 sample data file=~/Documents/redcard.data.R
~/Documents/logistic1 sample data file=~/Documents/redcard.data.R

These compile and sample. But how do I modify to set cores and threads, following the Reduce Sum: A Minimal Example case study ? How can I time things ?

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