Filesystem prefetch init.d script

gistfile1.sh

#!/bin/bash
### BEGIN INIT INFO
# Provides:          usr-prefetch
# Required-Start:    $remote_fs
# Required-Stop:     $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Prefetch system files to page cache.
# Description:       Prefetches files under /opt, /usr and /etc, and the FS entries for /.
### END INIT INFO

FULL_PREFETCH_PATHS="/usr /opt /usr/sbin /usr/lib /usr/bin /sbin /lib /bin /etc"
ENTRY_PREFETCH_PATHS="/usr /"

prefetch_full() {
  find $1 -type f -mount -print0 -readable 2>/dev/null | xargs -0 -L 200 cat >/dev/null
}

prefetch_entries() {
  find $1 -type f -mount -print0 -readable 2>/dev/null >/dev/null
}

prefetch() {
  for f in $FULL_PREFETCH_PATHS
  do
    prefetch_full $f
  done
  for f in $ENTRY_PREFETCH_PATHS
  do
    prefetch_entries $f
  done
}

case "$1" in
  start)
        prefetch &
        ;;
  stop)
        ;;
  restart|force-reload)
        prefetch &
        ;;
  *)
esac

exit 0