R Under development (unstable) (2024-06-05 r86695 ucrt) -- "Unsuffered Consequences"
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> require(confintROB)
Loading required package: confintROB
> require(lme4)
Loading required package: lme4
Loading required package: Matrix
> require(robustlmm)
Loading required package: robustlmm
> require(robustvarComp)
Loading required package: robustvarComp
> require(foreach)
Loading required package: foreach
> require(parallel)
Loading required package: parallel
> require(doParallel)
Loading required package: doParallel
Loading required package: iterators
> 
> cl <- makeCluster(2, type = "PSOCK")
> doParallel::registerDoParallel(cl)
> 
> control <- lmerControl(check.conv.grad = "ignore")
> 
> model.ML <-
+   lmer(Yield ~ (1 | Batch),
+        Dyestuff,
+        REML = FALSE,
+        control = control)
> 
> set.seed(123)
> parallelResults <- confintROB(model.ML, nsim = 3)
> 
> stopCluster(cl)
> registerDoSEQ()
> 
> set.seed(123)
> singleThreadedResults <- confintROB(model.ML, nsim = 3)
> stopifnot(all.equal(parallelResults, singleThreadedResults))
> 
> proc.time()
   user  system elapsed 
   3.37    0.32    6.68