tests/test-readahead.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright Red Hat
   4 #
   5 # Redistribution and use in source and binary forms, with or without
   6 # modification, are permitted provided that the following conditions are
   7 # met:
   8 #
   9 # * Redistributions of source code must retain the above copyright
  10 # notice, this list of conditions and the following disclaimer.
  11 #
  12 # * Redistributions in binary form must reproduce the above copyright
  13 # notice, this list of conditions and the following disclaimer in the
  14 # documentation and/or other materials provided with the distribution.
  15 #
  16 # * Neither the name of Red Hat nor the names of its contributors may be
  17 # used to endorse or promote products derived from this software without
  18 # specific prior written permission.
  19 #
  20 # THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  21 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  22 # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  23 # PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  24 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  27 # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  28 # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  29 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  30 # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31 # SUCH DAMAGE.
  32
  33 source ./functions.sh
  34 set -e
  35 set -x
  36
  37 requires_plugin sh
  38 requires_nbdsh_uri
  39 requires dd iflag=count_bytes </dev/null
  40
  41 files="readahead.out"
  42 rm -f $files
  43 cleanup_fn rm -f $files
  44
  45 nbdkit -fv -U - sh - \
  46        --filter=readahead \
  47        --run 'nbdsh --uri "$uri" -c "
  48 import time
  49 for i in range(0, 512*10, 512):
  50     h.pread(512, i)
  51 # Give some time for bgthread to finish.
  52 time.sleep(5)
  53 "' <<'EOF'
  54 case "$1" in
  55      block_size)
  56          echo 512 512 512
  57          ;;
  58      thread_model)
  59          echo parallel
  60          ;;
  61      can_cache)
  62          echo native
  63          ;;
  64      get_size)
  65          echo 1M
  66          ;;
  67      cache)
  68          echo "$@" >> readahead.out
  69          ;;
  70      pread)
  71          echo "$@" >> readahead.out
  72          dd if=/dev/zero count=$3 iflag=count_bytes
  73          ;;
  74      *)
  75          exit 2
  76          ;;
  77 esac
  78 EOF
  79
  80 cat readahead.out
  81
  82 # We should see the pread requests, and additional cache requests for
  83 # the 32K region following each pread request.
  84 for i in `seq 0 512 $((512*10 - 512))` ; do
  85     grep "pread  512 $i" readahead.out
  86     grep "cache  32768 $((i+512))" readahead.out
  87 done