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Ci-dessous, les différences entre deux révisions de la page.

--- tech:test_perf_io_disque [2025/03/24 15:06] – créée - modification externe 127.0.0.1
+++ tech:test_perf_io_disque [2025/03/28 13:44] (Version actuelle) – Jean-Baptiste
@@ Ligne 1: / Ligne 1: @@
+<!DOCTYPE markdown>
+{{tag>Perf IO FS IOWAIT}}
+# Test de perf IO disque
+Voir :
+* https://linuxfr.org/users/xunfr/journaux/how-to-bench-this-ssd
+* https://blog.hbis.fr/
+* http://strugglers.net/~andy/blog/2015/08/09/ssds-and-linux-native-command-queuing/
+* https://www.thomas-krenn.com/en/wiki/Linux_I/O_Performance_Tests_using_dd
+* https://medium.com/@kenichishibata/test-i-o-performance-of-linux-using-dd-a5074f1de9ce
+* https://linuxfr.org/users/xunfr/journaux/how-to-bench-this-ssd
+* http://drup.org/benchmarking-linux
+* https://wiki.mikejung.biz/Benchmarking
+Voir :
+* atop
+* stress-ng
+* iozone3
+~~~bash
+stress-ng --all 0 --maximize --aggressive
+~~~
+~~~bash
+iostat -hx 5
+iostat -xmt 1
+~~~
+Linux : tester les performances I/O
+~~~bash
+hdparm -t -T /dev/sda
+dd bs=8192 count=$((4096 * 128)) if=/dev/zero of=test conv=fdatasync
+bonnie++ -d /mnt -r 8000 -u toto
+~~~
+----------
+~~~bash
+#time -p dd if=/dev/zero of=/tmp/test1.img bs=1M count=500 oflag=dsync
+#time -p dd if=/dev/zero of=/tmp/test1.img bs=500M count=1 oflag=dsync
+time -p dd if=/dev/zero of=/tmp/test1.img bs=8192 count=$((8192 * 64)) oflag=dsync
+~~~
+~~~bash
+sudo apt-get install sysbench
+# --file-test-mode=STRING       test mode {seqwr, seqrewr, seqrd, rndrd, rndwr, rndrw}
+sysbench --test=fileio --file-test-mode=seqwr run
+sysbench --test=fileio --file-total-size=4G prepare
+sysbench --test=fileio --file-total-size=4G --file-test-mode=rndrd --max-time=5 run
+sysbench --test=fileio --file-total-size=4G --file-test-mode=rndwr --max-time=5 run
+sysbench --test=fileio --file-total-size=4G cleanup
+~~~
+### Disk Read-Ahead
+~~~bash
+blockdev --report
+blockdev --getra /dev/sda
+blockdev --setra 256 /dev/sdc
+cat /sys/block/sda/queue/read_ahead_kb
+~~~
+### fio
+Source https://www.geekarea.fr/wordpress/?p=769
+~~~bash
+apt-get install fio
+~~~
+~~~bash
+cat > plop.fio << EOF
+[global]
+bs=64k
+direct=1
+rw=randrw
+ioengine=libaio
+iodepth=2
+zonesize=256m
+zoneskip=2g
+write_bw_log=str
+[/dev/vdb]
+EOF
+fio plop.fio
+~~~
+## Linux IO scheduler
+~~~
+# cat /sys/block/sda/queue/scheduler
+noop deadline [cfq]
+~~~
+''/etc/default/grub''
+~~~bash
+# GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
+GRUB_CMDLINE_LINUX_DEFAULT="quiet splash elevator=noop"
+~~~
+## IOWAIT
+Voir :
+* https://access.redhat.com/solutions/56117