Linux Shell Scripting Cookbook - Third Edition

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The dstat utility can identify the top resource user in a category:

• -top-bio Disk Usage: This reports the process performing the most block I/O
• -top-cpu CPU Usage: This reports the process using the most CPU resources
• -top-io I/O usage: This reports the process performing the most I/O (usually network I/O)
• -top-latency System Load: This shows the process with the highest latency
• -top-mem Memory Usage: This shows the process using the most memory

The following example displays the CPU and Network usage and the top users in each category:

$ dstat -c -top-cpu -n -top-io
----total-cpu-usage---- -most-expensive- -net/total- ----most-expensive----
usr sys idl wai hiq siq|  cpu process   | recv  send|     i/o process      
 1 2 97 0 0 0|vmware-vmx ...