Docu review done: Mon 03 Jul 2023 16:37:50 CEST

Table of content

• Installation
• Measure latency
  • RAW Statistics
  • Samples

General

Latency measures with IOPing

Installation

$ apt install ioping

Measure latency

RAW Statistics

$ ioping -p 100 -c 200 -i 0 -q .

will output RAW data:

99 10970974 9024 36961531 90437 110818 358872 30756 100 12516420
100 9573265 10446 42785821 86849 95733 154609 10548 100 10649035
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)

Samples

Measure latency on . using 100 requests

$ ioping -c 100 .
4 KiB <<< . (xfs /dev/dm-2): request=1 time=16.3 ms (warmup)
4 KiB <<< . (xfs /dev/dm-2): request=2 time=253.3 us
4 KiB <<< . (xfs /dev/dm-2): request=3 time=284.0 ms
...
4 KiB <<< . (xfs /dev/dm-2): request=96 time=175.6 us (fast)
4 KiB <<< . (xfs /dev/dm-2): request=97 time=258.7 us (fast)
4 KiB <<< . (xfs /dev/dm-2): request=98 time=277.6 us (fast)
4 KiB <<< . (xfs /dev/dm-2): request=99 time=242.3 us (fast)
4 KiB <<< . (xfs /dev/dm-2): request=100 time=36.1 ms (fast)

--- . (xfs /dev/dm-2) ioping statistics ---
99 requests completed in 3.99 s, 396 KiB read, 24 iops, 99.3 KiB/s
generated 100 requests in 1.65 min, 400 KiB, 1 iops, 4.04 KiB/s
min/avg/max/mdev = 163.5 us / 40.3 ms / 760.0 ms / 118.5 ms

Last line shows the latency measures of the disk.

Measure latency on /tmp/using 10 requests of 1MB each

$ ioping -c 10 -s 1M /tmp

Measure disk seek rate

$ ioping -R /dev/sda

Measure disk sequential speed

$ ioping -RL /dev/sda

Get disk sequential speed in bytes per second

$ ioping -RLB . | awk '{print $4}'