#!/bin/bash -ex RUN_TIME=300 # approximate duration of run (seconds) [ $# -eq 1 ] && RUN_TIME="$1" IMAGE_NAME="image-$$" IMAGE_SIZE="1024" # MB function get_time() { date '+%s' } function times_up() { local end_time="$1" test $(get_time) -ge "${end_time}" } function map_unmap() { [ $# -eq 1 ] || exit 99 local image_name="$1" local dev dev="$(sudo rbd map "${image_name}")" sudo rbd unmap "${dev}" } #### Start rbd create "${IMAGE_NAME}" --size="${IMAGE_SIZE}" COUNT=0 START_TIME=$(get_time) END_TIME=$(expr $(get_time) + ${RUN_TIME}) while ! times_up "${END_TIME}"; do map_unmap "${IMAGE_NAME}" COUNT=$(expr $COUNT + 1) done ELAPSED=$(expr "$(get_time)" - "${START_TIME}") rbd rm "${IMAGE_NAME}" echo "${COUNT} iterations completed in ${ELAPSED} seconds"