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Difference between System, User and I/O wait CPU Consumption

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Difference between System, User and I/O wait CPU Consumption
Stechies

User CPU vs. System CPU vs. I/O Wait CPU

CPU utilization is typically separated in system CPU, user CPU and I/O wait CPU consumption:

CPU utilization type Description
User CPU:

CPU consumption originating from coding outside of the operating system kernel, e.g.:

  • Expensive operation in SAP HANA like scan of large table or counting a high amount of distinct values
  • Expensive operation of non-SAP HANA product running on same host
System CPU:

CPU consumption originating from the operating system kernel, e.g.:

  • Operating system background activities like memory defragmentation
  • Implicit OS calls of SAP HANA like active waits for locks or I/O requests
I/O Wait CPU: CPUs waiting for I/O requests to complete, can usually be considered as idle time.


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