mirror of
https://github.com/SCST-project/scst.git
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4d249a4112
git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@1001 d57e44dd-8a1f-0410-8b47-8ef2f437770f
237 lines
6.4 KiB
Bash
Executable File
237 lines
6.4 KiB
Bash
Executable File
#!/bin/sh
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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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usage() {
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echo "Usage: $0 [-a] [-d] [-i <i>] [-n] [-r] [-s <l2s>] [-t [user@]host] <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 " -f - force -- skip the test if there is still data present."
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echo " -i - number times each test is iterated."
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echo " -n - do not verify the data on <dev> before overwriting it."
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echo " -r - only perform the read test."
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echo " -s - logarithm base two of the I/O size."
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echo " -t - username and hostname of the target to drop the caches on."
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echo " <dev> - block device to run the I/O performance test on."
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}
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# Compute two raised to the power $1.
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pow2() {
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if [ $1 = 0 ]; then
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echo 1
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else
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echo $((2 * $(pow2 $(($1 - 1)) ) ))
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fi
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}
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# Report via the exit status whether or not the current user has sufficient
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# privileges to drop the VM caches.
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can_drop_cache() {
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[ -w /proc/sys/vm/drop_caches ]
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}
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drop_caches() {
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sync
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if can_drop_cache; then
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echo 3 > /proc/sys/vm/drop_caches
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fi
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if [ "${target_login}" != "" ]; then
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ssh -n ${target_login} 'sync; if [ -w /proc/sys/vm/drop_caches ]; then echo 3 > /proc/sys/vm/drop_caches; fi'
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fi
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}
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# Read times in seconds from stdin, one number per line, echo each number
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# using format $1, and also echo the average transfer size in MB/s, its
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# standard deviation and the number of IOPS using the total I/O size $2 and
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# the block transfer size $3.
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echo_and_calc_avg() {
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awk -v fmt="$1" -v iosize="$2" -v blocksize="$3" 'BEGIN{pow_2_20=1024*1024}{if ($1 != 0){n++;sum+=iosize/$1;sumsq+=iosize*iosize/($1*$1)};printf fmt, $1} END{d=(n>0?sumsq/n-sum*sum/n/n:0);avg=(n>0?sum/n:0);stddev=(d>0?sqrt(d):0);iops=avg/blocksize;printf fmt fmt fmt,avg/pow_2_20,stddev/pow_2_20,iops}'
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}
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#########################
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# Default settings #
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#########################
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force=false
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iterations=3
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log2_io_size=30 # 1 GB
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log2_min_blocksize=9 # 512 bytes
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log2_max_blocksize=26 # 64 MB
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iotype=direct
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read_test_only=false
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target_login=""
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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 -- $(/usr/bin/getopt "adfhi:nrs:t:" "$@")
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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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'-f') force="true"; shift;;
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'-i') iterations="$2"; shift; shift;;
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'-n') verify_device_data="false"; shift;;
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'-r') read_test_only="true"; shift;;
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'-s') log2_io_size="$2"; shift; shift;;
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'-t') target_login="$2"; shift; shift;;
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'--') shift;;
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*) usage; exit 1;;
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esac
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done
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if [ "$#" != 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 ${device} does not exist."
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exit 1
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fi
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if [ "${read_test_only}" = "false" -a ! -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 [ $(dd if="${device}" bs=1M count=$(pow2 $(($log2_io_size - 20))) \
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2>/dev/null | wc --bytes) -lt $(pow2 $log2_io_size) ]
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then
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echo "Error: device ${device} contains less than $(pow2 $log2_io_size) bytes."
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exit 1
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fi
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if [ "${read_test_only}" = "false" -a "${verify_device_data}" = "true" ] \
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&& [ "${force}" != "true" ] \
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&& ! cmp -s -n $(pow2 $log2_io_size) "${device}" /dev/zero
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then
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echo "Error: device ${device} still contains data."
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exit 1
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fi
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if ! can_drop_cache; then
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echo ""
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echo "WARNING: insufficient privileges to drop the file system cache"
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echo "-- results will be unreliable."
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echo ""
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fi
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if [ "${iotype}" = "direct" ]; then
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dd_oflags="oflag=direct conv=notrunc"
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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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# Header, line 1
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printf "%9s " blocksize
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i=0
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while [ $i -lt ${iterations} ]
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do
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printf "%8s " "W"
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i=$((i+1))
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done
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printf "%8s %8s %8s " "W(avg," "W(std," "W"
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i=0
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while [ $i -lt ${iterations} ]
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do
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printf "%8s " "R"
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i=$((i+1))
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done
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printf "%8s %8s %8s" "R(avg," "R(std" "R"
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printf "\n"
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# Header, line 2
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printf "%9s " "(bytes)"
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i=0
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while [ $i -lt ${iterations} ]
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do
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printf "%8s " "(s)"
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i=$((i+1))
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done
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printf "%8s %8s %8s " "MB/s)" ",MB/s)" "(IOPS)"
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i=0
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while [ $i -lt ${iterations} ]
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do
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printf "%8s " "(s)"
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i=$((i+1))
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done
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printf "%8s %8s %8s" "MB/s)" ",MB/s)" "(IOPS)"
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printf "\n"
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# Measurements
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log2_blocksize=${log2_max_blocksize}
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while [ ! $log2_blocksize -lt $log2_min_blocksize ]
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do
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if [ $log2_blocksize -gt $log2_io_size ]; then
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log2_blocksize=$((log2_blocksize - 1))
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continue
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fi
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iosize=$(pow2 $log2_io_size)
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bs=$(pow2 $log2_blocksize)
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count=$(pow2 $(($log2_io_size - $log2_blocksize)))
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printf "%9d " ${bs}
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i=0
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while [ $i -lt ${iterations} ]
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do
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if [ "${read_test_only}" = "false" ]; then
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drop_caches
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dd if=/dev/zero of="${device}" bs=${bs} count=${count} \
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${dd_oflags} 2>&1 \
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| sed -n -e 's/.* \([0-9.]*\) s,.*/\1/p' | sed 's/^$/0/'
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else
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echo " 0 s,"
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fi
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i=$((i+1))
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done | echo_and_calc_avg "%8.3f " ${iosize} ${bs}
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i=0
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while [ $i -lt ${iterations} ]
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do
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drop_caches
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dd if="${device}" of=/dev/null bs=${bs} count=${count} \
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${dd_iflags} 2>&1 \
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| sed -n -e 's/.* \([0-9.]*\) s,.*/\1/p' | sed 's/^$/0/'
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i=$((i+1))
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done | echo_and_calc_avg "%8.3f " ${iosize} ${bs}
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printf "\n"
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log2_blocksize=$((log2_blocksize - 1))
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done
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