CmdStan 2.27.0 release candidate

General
2

Hmm… running my usual performance regression test model finds quite some slowdown:

> fit_26$time()$total
[1] 20.14739
> fit_27$time()$total
[1] 24.8837
> fit_27b$time()$total
[1] 25.45731
>

26 is the 2.26.1 cmdstan, 27 is 2.27.0-rc1 cmdstan and 27 is 2.27.0-rc1 with STAN_NO_RANGE_CHECKS set.

The usual model & data:

blrm-exnex-26.stan (28.4 KB)
combo3.data.R (3.9 KB)

The above is run with this cmdstanr call:

iter <- 5000

fit_26 <- model_26$sample(
                       data = "blrm_exnex-combo3.data.R",
                       seed = 123,
                       chains = 1,
                       init=0,
                       parallel_chains = 1,
                       iter_warmup=iter,
                       iter_sampling=iter,
                       refresh = 100
                   )