tests/test-readahead.sh

   1 #!/usr/bin/env bash
   2 # nbdkit
   3 # Copyright (C) 2018-2019 Red Hat Inc.
   4 #
   5 # Redistribution and use in source and binary forms, with or without
   6 # modification, are permitted provided that the following conditions are
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   8 #
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  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 # Is the readahead filter faster?  Copy a blank disk with a custom
  34 # plugin that sleeps on every request.  Because the readahead filter
  35 # should result in fewer requests it should run faster.
  36
  37 source ./functions.sh
  38 set -e
  39 set -x
  40
  41 requires python3 --version
  42 requires python3 -c 'import nbd'
  43
  44 files="readahead.img"
  45 rm -f $files
  46 cleanup_fn rm -f $files
  47
  48 test ()
  49 {
  50     start_t=$SECONDS
  51     nbdkit -fv -U - "$@" sh ./test-readahead-test-plugin.sh \
  52            --run './test-readahead-test-request.py $unixsocket'
  53     end_t=$SECONDS
  54     echo $((end_t - start_t))
  55 }
  56
  57 t1=$(test --filter=readahead)
  58 t2=$(test)
  59
  60 # In the t1 case we should make only 1 request into the plugin,
  61 # resulting in around 1 sleep period (5 seconds).  In the t2 case we
  62 # make 10 requests so sleep for around 50 seconds.  t1 should be < t2
  63 # is every reasonable scenario.
  64 if [ $t1 -ge $t2 ]; then
  65     echo "$0: readahead filter took longer, should be shorter"
  66     exit 1
  67 fi