|
|
My Five Minutes of Musical Fame
|
|
IOPING(1) User Commands IOPING(1) NAME
ioping - simple disk I/O latency monitoring tool SYNOPSYS
ioping [-LCDRq] [-c count] [-w deadline] [-p period] [-i interval] [-s size] [-S wsize] [-o offset] device|file|directory 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. -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-insensi- tive): 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 <koct9i@gmail.com>. Man-page was written by Kir Kolyshkin <kir@openvz.org>. July 2011 IOPING(1)
