#!/bin/sh
root=/tmp/devpts
TIMEFORMAT='%3S'
n=100000
for a in `seq 1 $n`; do
  mkdir -p $root/$a/dev/pts
  # time mount -n -i -t devpts none $root/$a/dev/pts
  time mount -n -i -t ramfs none $root/$a/dev/pts
done
for a in `seq 1 $n`; do
  umount -n $root/$a/dev/pts
done
rm -rf $root