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https://github.com/SCST-project/scst.git
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9ad7406ef7
git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@766 d57e44dd-8a1f-0410-8b47-8ef2f437770f
139 lines
3.5 KiB
Bash
Executable File
139 lines
3.5 KiB
Bash
Executable File
#!/bin/bash
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############################################################################
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#
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# Script for testing block device I/O performance. Running this script on a
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# block device that is connected to a remote SCST target device allows to
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# test the performance of the transport protocols implemented in SCST. The
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# operation of this script is similar to iozone, while this script is easier
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# to use.
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#
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# Copyright (C) 2009 Bart Van Assche <bart.vanassche@gmail.com>.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation, version 2
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# of the License.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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############################################################################
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#########################
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# Function definitions #
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#########################
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function usage {
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echo "Usage: $0 [-a] [-d] [-n] [-s <l2s>] <dev>"
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echo " -a - use asynchronous (buffered) I/O."
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echo " -d - use direct (non-buffered) I/O."
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echo " -n - do not verify the data on <dev> before overwriting it."
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echo " -s - logarithm base two of the I/O size."
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echo " <dev> - block device to run the I/O performance test on."
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}
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function drop_caches {
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sync
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echo 3 > /proc/sys/vm/drop_caches
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}
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#########################
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# Default settings #
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#########################
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log2_io_size=30 # 1 GB
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log2_min_blocksize=12 # 4096 bytes
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log2_max_blocksize=26 # 64 MB
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iotype=direct
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verify_device_data=true
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#########################
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# Argument processing #
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#########################
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set -- $(/usr/bin/getopt "adns:" "$@")
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while [ "$1" != "${1#-}" ]
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do
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case "$1" in
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'-a') iotype="buffered"; shift;;
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'-d') iotype="direct"; shift;;
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'-n') verify_device_data="false"; shift;;
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'-s') log2_io_size="$2"; shift; shift;;
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'--') shift;;
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*) usage; exit 1;;
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esac
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done
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if [ "$#" != 1 ]; then
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usage
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exit 1
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fi
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device="$1"
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####################
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# Performance test #
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####################
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if [ ! -e "${device}" ]; then
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echo "Error: device ${device} does not exist."
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exit 1
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fi
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if [ ! -w "${device}" ]; then
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echo "Error: device ${device} is not writeable."
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exit 1
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fi
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if [ "${verify_device_data}" = "true" ] \
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&& ! cmp -s -n $((2**log2_io_size)) "${device}" /dev/zero
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then
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echo "Error: device ${device} still contains data."
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exit 1
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fi
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if [ "${iotype}" = "direct" ]; then
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dd_oflags="oflag=direct"
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dd_iflags="iflag=direct"
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else
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dd_oflags="oflag=sync"
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dd_iflags=""
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fi
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printf "%9s %8s %8s %8s %8s %8s %8s\n" blocksize W W W R R R
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for ((log2_blocksize = log2_max_blocksize;
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log2_blocksize >= log2_min_blocksize;
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log2_blocksize--))
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do
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if [ $log2_blocksize -gt $log2_io_size ]; then
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continue
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fi
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bs=$((2**log2_blocksize))
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count=$((2**(log2_io_size - log2_blocksize)))
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printf "%9d " ${bs}
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for ((i=0;i<3;i++))
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do
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drop_caches
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elapsed="$(dd if=/dev/zero of="${device}" bs=${bs} count=${count} \
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${dd_oflags} 2>&1 \
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| sed -n 's/.* \([0-9.]*\) s,.*/\1/p')"
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printf "%8s " "${elapsed}"
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done
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for ((i=0;i<3;i++))
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do
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drop_caches
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elapsed="$(dd if="${device}" of=/dev/null bs=${bs} count=${count} \
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${dd_iflags} 2>&1 \
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| sed -n 's/.* \([0-9.]*\) s,.*/\1/p')"
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printf "%8s " "${elapsed}"
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done
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printf "\n"
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done
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