#!/bin/bash # # Test lseek influence on qcow2 block-status # # Block layer may recursively check block_status in file child of qcow2, if # qcow2 driver returned DATA. There are several test cases to check influence # of lseek on block_status performance. To see real difference run on tmpfs. # # Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved. # # Tests originally written by Kevin Wolf # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. # if [ "$#" -lt 1 ]; then echo "Usage: $0 SOURCE_FILE" exit 1 fi ROOT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )/../../../.." >/dev/null 2>&1 && pwd )" QEMU_IMG="$ROOT_DIR/qemu-img" QEMU_IO="$ROOT_DIR/qemu-io" size=1G src="$1" # test-case plain ( $QEMU_IMG create -f qcow2 "$src" $size for i in $(seq 16384 -1 0); do echo "write $((i * 65536)) 64k" done | $QEMU_IO "$src" ) > /dev/null echo -n "plain: " /usr/bin/time -f %e $QEMU_IMG convert -n "$src" null-co:// # test-case forward ( $QEMU_IMG create -f qcow2 "$src" $size for i in $(seq 0 2 16384); do echo "write $((i * 65536)) 64k" done | $QEMU_IO "$src" for i in $(seq 1 2 16384); do echo "write $((i * 65536)) 64k" done | $QEMU_IO "$src" ) > /dev/null echo -n "forward: " /usr/bin/time -f %e $QEMU_IMG convert -n "$src" null-co:// # test-case prealloc $QEMU_IMG create -f qcow2 -o preallocation=metadata "$src" $size > /dev/null echo -n "prealloc: " /usr/bin/time -f %e $QEMU_IMG convert -n "$src" null-co://