Limits of concurrent request handling in R's single‑threaded interpreter
Goal Determine the practical concurrency ceiling for R services such as Plumber or Shiny before latency spikes become unacceptable. Constraints and uncertainty Base R runs a single‑threaded interpreter, so simultaneous requests are serialized. On Unix, parallel::mclapply forks child processes, adding fork‑and‑IPC overhead that grows with worker count. Garbag
r