get_param        2151 vm.c                 get_param("RUBY_THREAD_VM_STACK_SIZE",
get_param        2156 vm.c                 get_param("RUBY_THREAD_MACHINE_STACK_SIZE",
get_param        2161 vm.c                 get_param("RUBY_FIBER_VM_STACK_SIZE",
get_param        2166 vm.c                 get_param("RUBY_FIBER_MACHINE_STACK_SIZE",