NAME¶
ioping - simple disk I/O latency monitoring tool
SYNOPSYS¶
[
-LCDRq] [
-c
count] [
-w deadline]
[
-p period] [
-i
interval] [
-s size]
[
-S wsize] [
-o
offset] device|
file|
directory -h |
-v
DESCRIPTION¶
This tool lets you monitor I/O latency in real time.
OPTIONS¶
- -c count
- Stop after count requests.
- -w deadline
- Stop after deadline time passed.
- -p period
- Print raw statistics for every period requests.
- -i interval
- Set time between requests to interval
(1s).
- -s size
- Request size (4k).
- -S size
- Working set size (1m).
- -o offset
- Offset in input file.
- -L
- Use sequential operations rather than random. This also
sets request size to 256k (as in -s 256k).
- -C
- Use cached I/O.
- -D
- Use direct I/O.
- -R
- Disk seek rate test (same as -q -i 0 -w 3 -S
64m).
- -q
- Suppress human-readable output.
- -h
- Display help message and exit.
- -v
- Display version and exit.
Argument suffixes¶
For options that expect time argument (
-i and
-w), default is
seconds, unless you specify one of the following suffixes (case-insensitive):
- us, usec
- microseconds
- ms, msec
- milliseconds
- s, sec
- seconds
- m, min
- minutes
- h, hour
- hours
For options that expect "size" argument (
-s,
-S and
-o), default is bytes, unless you specify one of the following suffixes
(case-insensitive):
- s
- disk sectors (a sector is always 512).
- k, kb
- kilobytes
- p
- memory pages (a page is always 4K).
- m, mb
- megabytes
- g, gb
- gigabytes
- t, tb
- terabytes
For options that expect "number" argument (
-p and
-c)
you can optionally specify one of the following suffixes (case-insensitive):
- k
- kilo (thousands, 1 000)
- m
- mega (millions, 1 000 000)
- g
- giga (billions, 1 000 000 000)
- t
- tera (trillions, 1 000 000 000 000)
EXIT STATUS¶
Returns
0 upon success. The following error codes are defined:
- 1
- Invalid usage (error in arguments).
- 2
- Error during preparation stage.
- 3
- Error during runtime.
EXAMPLES¶
- ioping .
- Show disk I/O latency using the default values and the
current directory, until interrupted.
- ioping -c 10 -s 1M /tmp
- Measure latency on /tmp using 10 requests of 1
megabyte each.
- ioping -R /dev/sda
- Measure disk seek rate.
- ioping -RL /dev/sda
- Measure disk sequential speed.
SEE ALSO¶
Homepage
http://code.google.com/p/ioping/
AUTHORS¶
This program was written by Konstantin Khlebnikov Man-page was written by Kir
Kolyshkin
