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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.
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− | | + | |
− | <pre>
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− | - H/W Informatoin : Core2 Quad CPU
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− | - Target board : 192.168.155.20(Private IP) | + | |
− | - Opensource Utilities: | + | |
− | http://blogfiles6.naver.net/data42/2009/6/19/149/opensource-list-scheduling-invain.png
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− | - Graphical Test Map: | + | |
− | http://blogfiles13.naver.net/data44/2009/6/19/108/latency-worstcase-testscenario-invain.png
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− | </pre> | + | |
− | | + | |
− | = Latency Test Scenario =
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− | This is Test scenario to measure a latency guarantee in the worstcase environments using simple script and commands. | + | |
− | | + | |
− | == Latency Test ==
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− | <pre>
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− | ssh geunsik@192.168.155.20
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− | cd /opt/
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− | git clone git://git.kernel.org/pub/scm/linux/kernel/git/clrkwllms/rt-tests.git
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− | cd rt-tests
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− | make clean ; make
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− | cp ./cyclictest /usr/sbin/
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− | | + | |
− | # This is task to keep Latency(Max limitation: 200uSec) at the worst case.
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− | # Written by GeunSik,Lim
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− | # If you need histogram information just, Please Use -h option.
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− | time cyclictest -t1 -p 99 -i 1000 -n -l 1000000000000 -d 86400 -m -a 1
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− | </pre> | + | |
− | | + | |
− | == Stress Environments (for WorcaseCase) ==
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− | * Tip) Utilize iotop & top command to monitor CPU & IO Ratio.
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− | <pre>
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− | # Now, Below test code is background stress for the worst case in RT system.
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− | time cyclictest -t50 -p 80 -i 10000 -n -l 100000000000 -d 86400 -a 3
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− | | + | |
− | taskset -c 2,3 ./stress.20080904.sh
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− | ---------------------------
| + | |
− | #!/bin/sh
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− | # Most hardcore test (Ingo Molnar - http://lkml.org/lkml/2005/6/22/347)
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− | # For Heavy CPU Ratio.
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− | while true; do /bin/dd if=/dev/zero of=bigfile bs=1024000 count=1024; done &
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− | while true; do /usr/bin/killall hackbench; sleep 5; done &
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− | while true; do /sbin/hackbench 20; done &
| + | |
− | # some source code(ltp-full-20090531) consists of sched_setschduler() with FIFO 99.
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− | cd ltp-full-20090531; while true; do ./runalltests.sh -x 40; done &
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− | ----------------------------
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− | | + | |
− | # For 100% Usage of CPU Load using ping
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− | taskset -c 0 /bin/ping -l 100000 -q -s 10 -f localhost &
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− | taskset -c 1 /bin/ping -l 100000 -q -s 10 -f localhost &
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− | taskset -c 2 /bin/ping -l 100000 -q -s 10 -f localhost &
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− | taskset -c 3 /bin/ping -l 100000 -q -s 10 -f localhost &
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− | | + | |
− | # 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 ).
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− | # git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git linux-2.6.30
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− | cd /opt
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− | while true; do taskset -c 0 tar cvzf test1.tgz ./linux-2.6.30 ; done &
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− | 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 &
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− | | + | |
− | # Estimate file space usage ( for I/O Load)
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− | while true; do taskset -c 3 /bin/du / ; done &
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− | | + | |
− | # Network Stress ( Network Performance & Stress )
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− | /usr/bin/netserver
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− | /usr/bin/netperf -H 192.168.155.20 -t TCP_STREAM -A 16K,16K -l 3600
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− | # Streamming Stress using firefox webbrowser.
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− | firefox http://www.intomail.net/stream.php
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− | | + | |
− | # USB Disk I/O Stress(External HDD's I/O )
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− | cd /media/usb/
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− | taskset -c 2 tar cvzf test5.tgz /media/usb/linux-2.6.30 &
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− | | + | |
− | | + | |
− | = Contacts=
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− | * Geunsik Lim, leemgs1@gmail.com
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− | </pre> | + | |