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#!/bin/bash
#
# Copyright 2015 PMC-Sierra, Inc.
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# Author: Stephen Bates <stephen.bates@pmcs.com>
#
# Description:
# A shell script that calls the NVMe CLI multiple times to gather
# latency data. Consider this a poor man's iometer or fio for QD=1
# analysis. Of course this is below the file-system and block
# layer so is a best case measurement.
#
DEVICE=
WRITE=false
COUNT=10
DATA_SIZE=4096
METADATA_SIZE=64
RAND_BASE=temp.rand
RAND_WFILE=${RAND_BASE}.write
RAND_RFILE=${RAND_BASE}.read
OUTPUT=latency.dat
green=$(tput bold)$(tput setaf 2)
red=$(tput bold)$(tput setaf 1)
rst=$(tput sgr0)
while getopts ":d:n:w" opt; do
case $opt in
d)
DEVICE=${OPTARG}
;;
n)
COUNT=${OPTARG}
;;
w)
echo "WARNING: Write mode enabled, this might trash your drive!"
WRITE=true
;;
\?)
echo "Invalid option: -$OPTARG" >&2
exit 1
;;
:)
echo "Option -$OPTARG requires an argument." >&2
exit 1
;;
esac
done
if [ "$COUNT" == "0" ]; then
echo "Count can not be 0"
exit 1
fi
if [ -z "$DEVICE" ]; then
echo "regress: You must specify a NVMe device using -d"
exit 1
fi
function run_test {
$* | grep -i latency >> ${OUTPUT} 2>&1
if (( $? )); then
echo ${red}"FAILED!"${rst}
echo "Failed running command: "
echo " $*"
exit 1
fi
}
rm -f ${OUTPUT} > /dev/null || exit -1
make clean > /dev/null || exit -1
make install > /dev/null || exit -1
for i in `seq 1 ${COUNT}`;
do
if $WRITE ; then
dd if=/dev/urandom of=${RAND_WFILE} bs=${DATA_SIZE} count=1
run_test nvme write ${DEVICE} --start-block=0 --block-count=0 \
--metadata-size=${METADATA_SIZE} --data-size=${DATA_SIZE} \
--data ${RAND_WFILE} --latency
rm ${RAND_WFILE} > /dev/null
else
run_test nvme read ${DEVICE} --start-block=0 --block-count=0 \
--metadata-size=${METADATA_SIZE} --data-size=${DATA_SIZE} \
--data ${RAND_RFILE} --latency
rm ${RAND_RFILE} > /dev/null
fi
done
# Calculate average latency
SUM=0
for i in `cat ${OUTPUT} | awk '{print $3}' | xargs`
do
SUM=$(($SUM + $i))
done
AVERAGE=$(echo "scale=2; $SUM/$COUNT" | bc -l)
echo "Average Latency: $AVERAGE us"
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