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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@728 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2009-03-29 08:50:52 +00:00
parent ab8c63d1b0
commit 92f2da2e57
1 changed files with 64 additions and 0 deletions
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scripts/blockdev-perftest Executable file
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#!/bin/bash
############################################################################
#
# Script for testing block device I/O performance. Running this script on a
# block device that is connected to a remote SCST target device allows to
# test the performance of the transport protocols implemented in SCST. The
# operation of this script is similar to iozone, while this script is easier
# to use.
#
# Copyright (C) 2009 Bart Van Assche <bart.vanassche@gmail.com>.
#
# 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, version 2
# of the License.
#
# 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.
#
############################################################################
device="$1"
log2_io_size=31 # 2 GB
log2_min_blocksize=12 # 4096 bytes
log2_max_blocksize=26 # 64 MB
if [ ! -e "${device}" ]; then
echo "Error: device ${device} does not exist."
exit 1
fi
if [ ! -w "${device}" ]; then
echo "Error: device ${device} is not writeable."
exit 1
fi
if ! cmp -s -n $((2**log2_io_size)) "${device}" /dev/zero; then
echo "Error: device ${device} still contains data."
exit 1
fi
printf "%9s %8s %8s %8s %8s %8s %8s\n" blocksize W W W R R R
for ((log2_blocksize = log2_max_blocksize; log2_blocksize >= log2_min_blocksize; log2_blocksize--))
do
bs=$((2**log2_blocksize))
printf "%9d " ${bs}
for ((i=0;i<3;i++))
do
elapsed="$(dd if=/dev/zero of="${device}" bs=${bs} oflag=direct 2>&1 \
| sed -n 's/.* \([0-9.]*\) s,.*/\1/p')"
printf "%8s " "${elapsed}"
done
for ((i=0;i<3;i++))
do
elapsed="$(dd if="${device}" of=/dev/null bs=${bs} iflag=direct 2>&1 \
| sed -n 's/.* \([0-9.]*\) s,.*/\1/p')"
printf "%8s " "${elapsed}"
done
printf "\n"
done