Linux process Real-time IO monitoring iotop command detailed

Introduction

Most of the IO statistics tools under Linux, such as Iostat, Nmon, and so on, are only counted to the Per Device's read and write situations, and if you want to know how each process uses IO, it's a bit cumbersome.

Iotop is a top class tool used to monitor disk I/O usage. Iotop has a UI similar to top, which includes information about PID, user, I/O, process, and so on.

Example

Just run it straight.

Iotop

The output is as follows

Total DISK READ:       6.01/s | Total DISK write:       3.85 k/s  TID  PRIO  USER     DISK READ  disk write  swapin     io>    COMMAND                                                                                                          20074 be/4 hadoop      6.01 m    /s 0.00 B/S  0.00%  4.54 java-dproc_datanode-xmx8192m- Server  org.apache.hadoop.hdfs.server.datanode.DataNode 6371 be/4 Hadoop      0.00 B/S    3.25/M  0.00  0.00% Java-dproc_datanode-xmx8192m-server  org.apache.hadoop.hdfs.server.datanode.DataNode 8497 BE/4 Hadoop      0.00 B/S    3.67 m/s  0.00%  0.00% Java-dproc_datanode-xmx8192m-server  Org.apache.hadoop.hdfs.server.datanode.DataNode    1 BE/4 root        0.00 B/S    0.00 B/S  0.00%  0.00 Init    2 BE/4 root        0.00 B/S    0.00 B/S  0.00%  0.00% [Kthreadd]

by outputting The result, we can clearly know what program is reading and writing disk, speed and command line, PID and other information.

Linux process Real-time IO monitoring iotop command detailed