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DEFAULT_R_STACK_SIZE

miniextendr_api::thread

Constant DEFAULT_R_STACK_SIZE 

Source 
pub const DEFAULT_R_STACK_SIZE: usize = _; // 8_388_608usize
Expand description

Default stack size for R-compatible threads (8 MiB).

R doesn’t enforce a specific stack size - it uses whatever the OS provides:

  • Unix: Typically 8 MiB from ulimit -s
  • Windows: 64 MiB for the main thread (since R 4.2)

Since we disable R’s stack checking via StackCheckGuard, the size is about practical needs rather than R enforcement. Deep recursion in R code (especially recursive functions, lapply chains, or complex formulas) can use significant stack.

Rust’s default thread stack is only 2 MiB, which may be insufficient for deep R calls. We default to 8 MiB as a reasonable balance. Increase via RThreadBuilder::stack_size if you encounter stack overflows.