Table of Contents

Disk I/O on Linux Performance (sar, bwm-ng)


Table of Contents


Linux Command for Disk IO

sar -b

root@ubuntu20:~# sar -b 1
Linux 5.4.0-65-generic (ubuntu20)       03/04/2021      _x86_64_        (2 CPU)

09:11:45 AM       tps      rtps      wtps      dtps   bread/s   bwrtn/s   bdscd/s
09:11:46 AM      0.00      0.00      0.00      0.00      0.00      0.00      0.00
09:11:47 AM      0.00      0.00      0.00      0.00      0.00      0.00      0.00
09:11:48 AM      2.00      0.00      2.00      0.00      0.00     64.00      0.00
09:11:49 AM      0.00      0.00      0.00      0.00      0.00      0.00      0.00
09:11:50 AM      0.00      0.00      0.00      0.00      0.00      0.00      0.00
09:11:51 AM      2.00      0.00      2.00      0.00      0.00     16.00      0.00
09:11:52 AM      6.00      4.00      2.00      0.00     40.00     24.00      0.00
09:11:53 AM      0.00      0.00      0.00      0.00      0.00      0.00      0.00
09:11:54 AM      0.00      0.00      0.00      0.00      0.00      0.00      0.00
09:11:55 AM      0.00      0.00      0.00      0.00      0.00      0.00      0.00
^C

Average:         1.00      0.40      0.60      0.00      4.00     10.40      0.00
root@ubuntu20:~#


iostat

root@ubuntu20:~# iostat -xtk  1

03/04/2021 09:12:48 AM
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.00    0.00    0.50    0.00    0.00   99.50

Device            r/s     rkB/s   rrqm/s  %rrqm r_await rareq-sz     w/s     wkB/s   wrqm/s  %wrqm w_await wareq-sz     d/s     dkB/s   drqm/s  %drqm d_await dareq-sz  aqu-sz  %util
loop0            0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00   0.00
loop1            0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00   0.00
loop2            0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00   0.00
loop3            0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00   0.00
loop4            0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00   0.00
loop5            0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00   0.00
loop6            0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00   0.00
scd0             0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00   0.00
vda              0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00      0.00     0.00   0.00    0.00     0.00    0.00   0.00

^C
root@ubuntu20:~#


iotop for check the process using i/o

root@ubuntu20:~# iotop

Total DISK READ:       386.75 K/s | Total DISK WRITE:        19.34 K/s
Current DISK READ:     386.75 K/s | Current DISK WRITE:       7.74 K/s
    TID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>    COMMAND
    831 be/4 www-data  286.20 K/s    0.00 B/s  0.00 %  0.29 % php-fpm: pool www
    832 be/4 www-data  100.56 K/s    0.00 B/s  0.00 %  0.21 % php-fpm: pool www
  82613 be/4 www-data    0.00 B/s   19.34 K/s  0.00 %  0.00 % nginx: worker process
      1 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % init maybe-ubiquity
      2 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [kthreadd]
      3 be/0 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [rcu_gp]
      4 be/0 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [rcu_par_gp]
      6 be/0 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [kworker/0:0H-kblockd]
      9 be/0 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [mm_percpu_wq]
     10 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [ksoftirqd/0]
     11 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [rcu_sched]
     12 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [migration/0]
     13 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [idle_inject/0]
     14 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [cpuhp/0]
     15 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [cpuhp/1]


dstat -tr

root@ubuntu20:~# dstat -tr
----system---- --io/total-
     time     | read  writ
04-03 09:15:55|1.53  1.52
04-03 09:15:56|1.00     0
04-03 09:15:57|   0  2.00
04-03 09:15:58|   0     0
04-03 09:15:59|   0     0
04-03 09:16:00|1.00  1.00
04-03 09:16:01|3.00     0
04-03 09:16:02|   0     0
04-03 09:16:03|39.0  4.00 ^C
root@ubuntu20:~#

dstat (read, write, sum)

root@ubuntu20:~#  dstat -tr | awk -F '|' 'NR>2{split($2,arr," ");sum=arr[1]+arr[2];print $0,sum}'
04-03 09:16:56|1.53  1.52  3.05
04-03 09:16:57|   0     0  0
04-03 09:16:58|   0     0  0
04-03 09:16:59|   0     0  0
04-03 09:17:00|   0     0  0
04-03 09:17:01|   0     0  0
04-03 09:17:02|2.00     0  2
04-03 09:17:03|   0     0  0
04-03 09:17:04|   0  3.00  3
04-03 09:17:05|1.00     0  1
04-03 09:17:06|   0  2.00  2
04-03 09:17:07|   0     0  0
04-03 09:17:08|   0     0  0
04-03 09:17:09|   0     0  0
04-03 09:17:10|   0     0  0
04-03 09:17:11|   0     0  0
04-03 09:17:12|   0  2.00  2
04-03 09:17:13|4.00     0  4
04-03 09:17:14|   0     0  0




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