Introduction to monitoring under Linux

1. Disk IO monitoring Tool iotop

Input command: Iotop main View the disk IO information used by the program

Installation: Yum-y Install Iotop

First line:
10:01:23-Current system time
126 days, 14:29-the system has been running for 126 day, 14 hours, 29 minutes (not restarted during this period)
2 users-currently has 2 users logged into the system
The three numbers behind the load average:1.15, 1.42, 1.44-load average are 1-minute, 5-minute, 15-minute loads respectively.

Second line:
tasks-task (process), the system now has a total of 183 processes, of which there are 1 in the running, 182 in hibernation (sleep), 0 in the stoped state, and 0 in the zombie State (zombie).

Third line: CPU status
6.7% us-the percentage of CPU consumed by user space.
0.4% sy-the percentage of CPU consumed by the kernel space.
0.0% ni-The percentage of processes that have changed priority CPU%
Span style= "Font-family:microsoft Yahei; font-size:15px ">92.9% id-Idle CPU percentage
0.0% wa- Percentage of Io waiting on CPU
0.0% hi-hard Interrupt (Hardware IRQ) Percentage of CPU occupied
0.0% si-soft Interrupt (software Interrupts) Percentage of CPU consumed

Line four: Memory status
8306544k total-Total Physical memory (8GB)
7775876k used-Total Memory in use (7.7GB)
530668k free-Total free memory (530M)
79236k buffers-Cache Memory (79M)

Line five: Swap swap partition
2031608k total-Swap Area total (2GB)
Total swap area used by 2556k used-(2.5M)
2029052k free-Total Idle swap area (2GB)
4231276k cached-Buffer Swap area total (4GB)

Common shortcut keys:

left and right arrows: Change the sorting method, by default, sort by IO. R: Change the sort order. O: Only processes with IO output are displayed. P: Switch the way the process/thread is displayed. A: Displays cumulative usage. Q: Exit.

from: Http://man.linuxde.net/iotop

Left and right arrows: Change the sorting mode by default by IO sort

R: Change the sort order

O: Show only programs with IO output

P: Process/thread display mode toggle

A: Show cumulative usage

Q: Exit

switching the way processes/threads are displayed

from: http://man.linuxde.net/iotop=

Introduction to monitoring under Linux