System information

System Monitoring Utilities 27
8 IFL 0.00 0.00 | |
9 IFL 0.00 0.00 | |
534.79 10.78
Output for the sys window under z/VM:
15:46:57 | T6360003 | CPU-T: UN(16) ? = help
cpuid cpu visual
(#) (%) (vis)
0 548.72 |######################################### |
548.72
2.3.6 A top-like I/O Monitor: iotop
The iotop utility displays a table of I/O usage by processes or threads.
TIP
iotop is not installed by default. You need to install it manually with zypper
in iotop as root.
iotop displays columns for the I/O bandwidth read and written by each process dur-
ing the sampling period. It also displays the percentage of time the process spent while
swapping in and while waiting on I/O. For each process, its I/O priority (class/level) is
shown. In addition, the total I/O bandwidth read and written during the sampling peri-
od is displayed at the top of the interface.
Use the left and right arrows to change the sorting, R to reverse the sorting order, O to
toggle the --only option, P to toggle the --processes option, A to toggle the --
accumulated option, Q to quit or I to change the priority of a thread or a process'
thread(s). Any other key will force a refresh.
Following is an example output of the command iotop --only, while find and
emacs are running:
tux@mercury:~> iotop --only
Total DISK READ: 50.61 K/s | Total DISK WRITE: 11.68 K/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
3416 be/4 ke 50.61 K/s 0.00 B/s 0.00 % 4.05 % find /
275 be/3 root 0.00 B/s 3.89 K/s 0.00 % 2.34 % [jbd2/sda2-8]
5055 be/4 ke 0.00 B/s 3.89 K/s 0.00 % 0.04 % emacs
iotop can be also used in a batch mode (-b) and its output stored in a file for later
analysis. For a complete set of options, see the manual page (man 1 iotop).