From dc597ce8df5ae6efd2728a2d7ba7d92486028f79 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 2 Jul 2021 22:40:30 +0200 Subject: Adding upstream version 1.12. Signed-off-by: Daniel Baumann --- scripts/latency | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 114 insertions(+) create mode 100755 scripts/latency (limited to 'scripts/latency') diff --git a/scripts/latency b/scripts/latency new file mode 100755 index 0000000..908ae4a --- /dev/null +++ b/scripts/latency @@ -0,0 +1,114 @@ +#!/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 +# +# 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" -- cgit v1.2.3