NAME

       ioping - simple disk I/O latency monitoring tool

SYNOPSYS

       ioping [-LABCDWRq] [-c count] [-w deadline] [-p period] [-P period] [-i interval] [-s size] [-S wsize]
              [-o offset] directory|file|device
       ioping -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.

       -P period
              Print raw statistics for every period in time.

       -i interval
              Set time between requests to interval (1s).

       -s size
              Request size (4k).

       -S size
              Working set size (1m for directory, full size for file or device).

       -o offset
              Offset of working set in the file/device (0).

       -L     Use sequential operations rather than random. This also sets request size to 256k (as in -s 256k).

       -A     Use asynchronous I/O (syscalls io_submit(2), io_submit(2), etc).

       -C     Use cached I/O (suppress cache invalidation via posix_fadvise(2)).

       -D     Use direct I/O (see O_DIRECT in open(2)).

       -W     Use  writes  rather  than reads.  *DANGEROUS* It will shred your data if target is file or device,
              repeat key tree times (-WWW) to do this.

       -R     Disk seek rate test (same as -q -i 0 -w 3 -S 64m).

       -B     Batch mode. Be quiet and print final statistics in raw format.

       -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 24165 4138 16950134 190 242 2348 214
       (1) (2)   (3)  (4)      (5) (6) (7)  (8)

       (1) number of requests
       (2) serving 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)

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

       iostat(1), dd(1), fio(1), dbench(1), fsstress, xfstests, hdparm(8), badblocks(8),

HOMEPAGE

       http://code.google.com/p/ioping/.

AUTHORS

       This program was written by Konstantin Khlebnikov koct9i@gmail.com.
       Man-page was written by Kir Kolyshkin kir@openvz.org.

                                                    Dec 2013                                           IOPING(1)