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| − | This is Realtime Latency Test Scenario during 24hours. In this experiment,I adjusted CPU Affinity Policy to reduce Latency overheads in the Multicore.
| + | <div style="margin:0; margin-top:10px; margin-right:10px; border:1px solid #dfdfdf; padding:0 1em 1em 1em; background-color:#f9e9e9; align:right;"> |
| − | | + | <b>This wiki is being migrated to the Linux Foundation Real-Time Linux Project hosted wiki. The new page is available at: https://wiki.linuxfoundation.org/realtime/documentation/howto/tools/worstcaselatency. This page is now deprecated.</b> |
| − | = Requirements = | + | </div> |
| − | Prepare cyclictest(rt-tests), taskset, chrt, ltp-full-20090531.tar.gz ,hackbench , ping, dd, tar, netperf commands.
| + | |
| − | | + | |
| − | <pre>
| + | |
| − | - H/W Informatoin : Core2 Quad CPU
| + | |
| − | - Target board : 192.168.155.20(Private IP) | + | |
| − | - Opensource Utilities: | + | |
| − | http://blogfiles6.naver.net/data42/2009/6/19/149/opensource-list-scheduling-invain.png
| + | |
| − | - Graphical Test Map: | + | |
| − | http://blogfiles13.naver.net/data44/2009/6/19/108/latency-worstcase-testscenario-invain.png
| + | |
| − | </pre> | + | |
| − | | + | |
| − | = Latency Test Scenario =
| + | |
| − | This is Test scenario to measure a latency guarantee in the worstcase environments using simple script and commands. | + | |
| − | | + | |
| − | == Latency Test ==
| + | |
| − | <pre>
| + | |
| − | ssh geunsik@192.168.155.20
| + | |
| − | cd /opt/
| + | |
| − | git clone git://git.kernel.org/pub/scm/linux/kernel/git/clrkwllms/rt-tests.git
| + | |
| − | cd rt-tests
| + | |
| − | make clean ; make
| + | |
| − | cp ./cyclictest /usr/sbin/
| + | |
| − | | + | |
| − | # This is task to keep Latency(Max limitation: 200uSec) at the worst case.
| + | |
| − | # Written by GeunSik,Lim
| + | |
| − | # If you need histogram information just, Please Use -h option.
| + | |
| − | time cyclictest -t1 -p 99 -i 1000 -n -l 1000000000000 -d 86400 -m -a 1
| + | |
| − | </pre> | + | |
| − | | + | |
| − | == Stress Environments (for WorcaseCase) ==
| + | |
| − | * Tip) Utilize iotop & top command to monitor CPU & IO Ratio.
| + | |
| − | <pre>
| + | |
| − | # Now, Below test code is background stress for the worst case in RT system.
| + | |
| − | time cyclictest -t50 -p 80 -i 10000 -n -l 100000000000 -d 86400 -a 3
| + | |
| − | | + | |
| − | taskset -c 2,3 ./stress.20080904.sh
| + | |
| − | ---------------------------
| + | |
| − | #!/bin/sh
| + | |
| − | # Most hardcore test (Ingo Molnar - http://lkml.org/lkml/2005/6/22/347)
| + | |
| − | # For Heavy CPU Ratio.
| + | |
| − | while true; do /bin/dd if=/dev/zero of=bigfile bs=1024000 count=1024; done &
| + | |
| − | while true; do /usr/bin/killall hackbench; sleep 5; done &
| + | |
| − | while true; do /sbin/hackbench 20; done &
| + | |
| − | # some source code(ltp-full-20090531) consists of sched_setschduler() with FIFO 99.
| + | |
| − | cd ltp-full-20090531; while true; do ./runalltests.sh -x 40; done &
| + | |
| − | ----------------------------
| + | |
| − | | + | |
| − | # For 100% Usage of CPU Load using ping
| + | |
| − | taskset -c 0 /bin/ping -l 100000 -q -s 10 -f localhost &
| + | |
| − | taskset -c 1 /bin/ping -l 100000 -q -s 10 -f localhost &
| + | |
| − | taskset -c 2 /bin/ping -l 100000 -q -s 10 -f localhost &
| + | |
| − | taskset -c 3 /bin/ping -l 100000 -q -s 10 -f localhost &
| + | |
| − | | + | |
| − | # For 100% Usage of I/O Load using linux-2.6.30 tar source like tiobench s/w.
| + | |
| − | # Don't forget disk total usage ratio (ex: df ).
| + | |
| − | # git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git linux-2.6.30
| + | |
| − | cd /opt
| + | |
| − | while true; do taskset -c 0 tar cvzf test1.tgz ./linux-2.6.30 ; done &
| + | |
| − | while true; do taskset -c 1 tar cvzf test2.tgz ./linux-2.6.30 ; done &
| + | |
| − | while true; do taskset -c 2 tar cvzf test3.tgz ./linux-2.6.30 ; done &
| + | |
| − | while true; do taskset -c 3 tar cvzf test4.tgz ./linux-2.6.30 ; done &
| + | |
| − | | + | |
| − | # Estimate file space usage ( for I/O Load)
| + | |
| − | while true; do taskset -c 3 /bin/du / ; done &
| + | |
| − | | + | |
| − | # Network Stress ( Network Performance & Stress )
| + | |
| − | /usr/bin/netserver
| + | |
| − | /usr/bin/netperf -H 192.168.155.20 -t TCP_STREAM -A 16K,16K -l 3600
| + | |
| − | # Streamming Stress using firefox webbrowser.
| + | |
| − | firefox http://www.intomail.net/stream.php
| + | |
| − | | + | |
| − | # USB Disk I/O Stress(External HDD's I/O )
| + | |
| − | cd /media/usb/
| + | |
| − | taskset -c 2 tar cvzf test5.tgz /media/usb/linux-2.6.30 &
| + | |
| − | | + | |
| − | | + | |
| − | = Contacts=
| + | |
| − | * Geunsik Lim, leemgs1@gmail.com
| + | |
| − | </pre> | + | |
