Events OS Metrics: Difference between revisions

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=Overview=
=Overview=


CPU
=CPU Metrics=
 
==CpuUserTime==
 
The percentage of total CPU time spent executing code in user mode.
 
Also see: [[/proc/stat cpu user time reading|/proc/stat#user]]
 
([https://github.com/NovaOrdis/events-api/blob/master/src/main/java/io/novaordis/events/api/metric/os/mdefs/CpuUserTime.java GitHub])
 
 
 
==CpuNiceTime==


* <span id=""></span>CpuUserTime ([https://github.com/NovaOrdis/events-api/blob/master/src/main/java/io/novaordis/events/api/metric/os/mdefs/CpuUserTime.java GitHub])
* <span id=""></span>CpuNiceTime ([https://github.com/NovaOrdis/events-api/blob/master/src/main/java/io/novaordis/events/api/metric/os/mdefs/CpuNiceTime.java GitHub])
* <span id=""></span>CpuNiceTime ([https://github.com/NovaOrdis/events-api/blob/master/src/main/java/io/novaordis/events/api/metric/os/mdefs/CpuNiceTime.java GitHub])
* <span id='nice'></span>'''nice''' - time in [[Linux_7_General_Concepts#USER_HZ|USER_HZ]] units spent in user mode with low priority (nice).
* <span id='system'></span>'''system''' - time in [[Linux_7_General_Concepts#USER_HZ|USER_HZ]] units spent in system mode: kernel executing system calls on behalf of processes.
* <span id='idle'></span>'''idle''' - time in [[Linux_7_General_Concepts#USER_HZ|USER_HZ]] units spent in idle mode. This value should be USER_HZ times the second entry in [[/proc/uptime]].
* <span id='iowait'></span>'''iowait''' - time in [[Linux_7_General_Concepts#USER_HZ|USER_HZ]] units processes are waiting for I/O to complete. The CPU will not wait for IO, it will be schedule onto another task or will enter idle state. When a CPU goes into idle state for outstanding task I/O, another task will be scheduled on this CPU. On a multi-core CPU, the task waiting for I/O to complete is not running on any CPU, so the iowait of each CPU is difficult to calculate.
* <span id='irq'></span>'''irq''' - time in [[Linux_7_General_Concepts#USER_HZ|USER_HZ]] units spent servicing hardware interrupts.
* <span id='softirq'></span>'''softirq''' - time in [[Linux_7_General_Concepts#USER_HZ|USER_HZ]] units spent servicing softirqs.
* <span id='steal'></span>'''steal''' - time in [[Linux_7_General_Concepts#USER_HZ|USER_HZ]] units spent in other operating systems when running in a virtualized environment.
* <span id='guest'></span>'''guest''' - time in [[Linux_7_General_Concepts#USER_HZ|USER_HZ]] units spent running a virtual CPU for guest operating systems under the control of the Linux kernel. More details: [[Linux_Virtualization_Concepts#Steal_Time|Steal Time]].
* <span id='guest_nice'></span>'''guest_nice''' - time in [[Linux_7_General_Concepts#USER_HZ|USER_HZ]] units spent running a niced guest (virtual CPU for guest operating systems under the control of the Linux kernel).
* <span id=""></span>CpuKernelTime ([https://github.com/NovaOrdis/events-api/blob/master/src/main/java/io/novaordis/events/api/metric/os/mdefs/CpuKernelTime.java GitHub])
* <span id=""></span>CpuKernelTime ([https://github.com/NovaOrdis/events-api/blob/master/src/main/java/io/novaordis/events/api/metric/os/mdefs/CpuKernelTime.java GitHub])
* <span id=""></span>CpuIoWaitTime ([https://github.com/NovaOrdis/events-api/blob/master/src/main/java/io/novaordis/events/api/metric/os/mdefs/CpuIoWaitTime.java GitHub])
* <span id=""></span>CpuIoWaitTime ([https://github.com/NovaOrdis/events-api/blob/master/src/main/java/io/novaordis/events/api/metric/os/mdefs/CpuIoWaitTime.java GitHub])

Revision as of 22:22, 10 September 2017

Internal

Overview

CPU Metrics

CpuUserTime

The percentage of total CPU time spent executing code in user mode.

Also see: /proc/stat#user

(GitHub)


CpuNiceTime


  • nice - time in USER_HZ units spent in user mode with low priority (nice).
  • system - time in USER_HZ units spent in system mode: kernel executing system calls on behalf of processes.
  • idle - time in USER_HZ units spent in idle mode. This value should be USER_HZ times the second entry in /proc/uptime.
  • iowait - time in USER_HZ units processes are waiting for I/O to complete. The CPU will not wait for IO, it will be schedule onto another task or will enter idle state. When a CPU goes into idle state for outstanding task I/O, another task will be scheduled on this CPU. On a multi-core CPU, the task waiting for I/O to complete is not running on any CPU, so the iowait of each CPU is difficult to calculate.
  • irq - time in USER_HZ units spent servicing hardware interrupts.
  • softirq - time in USER_HZ units spent servicing softirqs.
  • steal - time in USER_HZ units spent in other operating systems when running in a virtualized environment.
  • guest - time in USER_HZ units spent running a virtual CPU for guest operating systems under the control of the Linux kernel. More details: Steal Time.
  • guest_nice - time in USER_HZ units spent running a niced guest (virtual CPU for guest operating systems under the control of the Linux kernel).



Memory

Swap

  • SwapTotal
  • SwapUsed
  • SwapFree

Load Average

  • LoadAverageLastMinute
  • LoadAverageLastFiveMinutes
  • LoadAverageLastTenMinutes
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