ioping (1) - Linux Manuals
ioping: simple disk I/O latency monitoring tool
NAME
ioping - simple disk I/O latency monitoring toolSYNOPSYS
[ -ABCDLRWGYykq ] [ -c count ] [ -i interval ] [ -l speed ] [ -t time ] [ -T time ] [ -s size ] [ -S wsize ] [ -o offset ] [ -w deadline ] [ -p period ] [ -P period ] directory|file|device-h | -v
DESCRIPTION
This tool generates various I/O patterns and lets you monitor I/O speed and latency in real time.OPTIONS
- -c
count - Stop after count requests.
- -i
interval - Set time between requests to interval (1s).
- -l
speed - Set speed limit in bytes per second. Set interval to request-size / speed.
- -t
time - Minimal valid request time (0us). Too fast requests are ignored in statistics.
- -T
time - Maximum valid request time. Too slow requests are ignored in statistics.
- -s
size - Request size (4k).
- -S
wsize - Working set size (1m for directory, whole size for file or device).
- -o
offset - Starting offset in the file/device (0).
- -w
deadline - Stop after deadline time passed.
- -p
period - Print raw statistics for every period requests (see format below).
- -P
period - Print raw statistics for every period in time.
- -A
- Use asynchronous I/O (syscalls io_submit(2), io_submit(2), etc).
- -B
- Batch mode. Be quiet and print final statistics in raw format.
- -C
- Use cached I/O. Suppress cache invalidation via posix_fadvise(2)) before read and fdatasync(2) after each write.
- -D
- Use direct I/O (see O_DIRECT in open(2)).
- -L
- Use sequential operations rather than random. This also sets default request size to 256k (as in -s 256k).
- -R
- Disk seek rate test. This option suppress human-readable output for each request (as -q), sets default interval to zero (-i 0), stops measurement after 3 seconds (-w 3) and increases default working set size to 64m (-S 64m). Working set (-S) should be increased accordingly if disk has huge cache.
- -W
- Use writes rather than reads. Safe for directory target. Write I/O gives more reliable results for systems where non-cached reads are not supported or cached at some level. Might be *DANGEROUS* for file/device: it will shred your data. In this case should be repeated tree times (-WWW).
- -G
- Alternate read and write requests.
- -Y
- Use sync I/O (see O_SYNC in open(2)).
- -y
- Use data sync I/O (see O_DSYNC in open(2)).
- -k
- Keep and reuse temporary working file "ioping.tmp" (only for directory target).
- -q
- Suppress periodical human-readable output.
- -h
- Display help message and exit.
- -v
- Display version and exit.
Argument suffixes
For options that expect time argument (-i, -P and -w), default is seconds, unless you specify one of the following suffixes (case-insensitive):- us,
usec - microseconds (a millionth of a second, 1 / 1 000 000)
- ms,
msec - milliseconds (a thousandth of a second, 1 / 1 000)
- 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):
- sector
- disk sectors (a sector is always 512).
- KiB,
k, kb - kilobytes (1 024 bytes)
- page
- memory pages (a page is always 4KiB).
- MiB,
m, mb - megabytes (1 048 576 bytes)
- GiB,
g, gb - gigabytes (1 073 741 824 bytes)
- TiB,
t, tb - terabytes (1 099 511 627 776 bytes)
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.
RAW STATISTICS
ioping -p 100 -c 200 -i 0 -q .100 26694 3746 15344272 188 267 1923 228 100 26694
100 24165 4138 16950134 190 242 2348 214 100 24165
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
(1) count of requests in statistics
(2) running time (usec)
(3) requests per second (iops)
(4) transfer speed (bytes/sec)
(5) minimal request time (usec)
(6) average request time (usec)
(7) maximum request time (usec)
(8) request time standard deviation (usec)
(9) total requests (including too slow and too fast)
(10) total running time (usec)
EXAMPLES
- ioping .
- Show disk I/O latency using the default values and the current directory, until interrupted. This command prepares temporary (unlinked/hidden) working file and reads random chunks from it using non-cached read requests.
- 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.
- ioping -RLB . | awk '{print $4}'
- Get disk sequential speed in bytes per second.
HOMEPAGE
AUTHORS
This program was written by Konstantin KhlebnikovMan-page was written by Kir Kolyshkin