Зручний інструмент для вимірювання затримок I/O-операцій з дисками (позиціонування, послідовне читання, тощо). За форматом дуже схожий на ping.
ioping
This tool lets you monitor I/O latency in real time. It shows disk latency in the same way as ping shows network latency.
Usage: ioping [-LABCDWRq] [-c count] [-w deadline] [-pP period] [-i interval]
[-s size] [-S wsize] [-o offset] device|file|directory
ioping -h | -v
-c <count> stop after <count> requests
-w <deadline> stop after <deadline>
-p <period> print raw statistics for every <period> requests
-P <period> print raw statistics for every <period> in time
-i <interval> interval between requests (1s)
-s <size> request size (4k)
-S <wsize> working set size (1m)
-o <offset> offset in file (0)
-L use sequential operations (includes -s 256k)
-A use asynchronous I/O
-C use cached I/O
-D use direct I/O
-W use write I/O *DANGEROUS*
-R seek rate test (same as -q -i 0 -w 3 -S 64m)
-B print final statistics in raw format
-q suppress human-readable output
-h display this message and exit
-v display version and exit
https://code.google.com/p/ioping/
