Name
- system.cpu.guest
- Percent (Unit)
- The percent of time the CPU spent running the virtual processor. Only applies to hypervisors.
- system.cpu.idle
- Percent (Unit)
- Percent of time the CPU spent in an idle state.
- system.cpu.iowait
- Percent (Unit)
- The percent of time the CPU spent waiting for IO operations to complete.
- system.cpu.stolen
- Percent (Unit)
- The percent of time the virtual CPU spent waiting for the hypervisor to service another virtual CPU. Only applies to virtual machines.
- system.cpu.system
- Percent (Unit)
- The percent of time the CPU spent running the kernel.
- system.cpu.user
- Percent (Unit)
- The percent of time the CPU spent running user space processes.
計(jì)算公式
system.cpu.guest = %guest
system.cpu.idle = %idle
system.cpu.iowait = %iowait
system.cpu.stolen = %steal
system.cpu.system = %sys + %irq + %soft
system.cpu.user = %usr + %user + %nice
數(shù)據(jù)來(lái)源
針對(duì)Linux系統(tǒng)皆警，DataDog Agent使用mpstat實(shí)時(shí)監(jiān)控工具奈懒，獲取CPU相關(guān)的Metrics。DataDog Agent并沒(méi)有獲取各個(gè)CPU的詳細(xì)信息白群，而是所有CPU的平均值。
mpstat是Multiprocessor Statistics的縮寫(xiě)，是實(shí)時(shí)系統(tǒng)CPU監(jiān)控工具。監(jiān)控信息來(lái)自內(nèi)核文件：/proc/stat
mpstat輸出內(nèi)容示例
# mpstat 1 3
Linux 3.10.0-693.21.1.el7.x86_64 (ip-172-31-22-228.cn-north-1.compute.internal) 08/29/2018 _x86_64_ (8 CPU)
05:59:14 AM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
05:59:15 AM all 8.06 0.13 7.15 0.00 0.00 0.78 0.13 0.00 0.00 83.75
05:59:16 AM all 14.61 0.00 8.16 0.00 0.00 1.05 0.26 0.00 0.00 75.92
05:59:17 AM all 18.69 0.13 5.75 0.00 0.00 0.78 0.13 0.00 0.00 74.51
Average: all 13.78 0.09 7.02 0.00 0.00 0.87 0.17 0.00 0.00 78.07
各個(gè)字段含義如下(internal時(shí)間段內(nèi)的平均值)
CPU Processor number. The keyword all indicates that statistics are calculated as averages among all processors.
%usr Show the percentage of CPU utilization that occurred while executing at the user level (application).
%nice Show the percentage of CPU utilization that occurred while executing at the user level with nice priority.
%sys Show the percentage of CPU utilization that occurred while executing at the system level (kernel). Note that this does not include time spent servicing hardware and software interrupts.
%iowait Show the percentage of time that the CPU or CPUs were idle during which the system had an outstanding disk I/O request.
%irq Show the percentage of time spent by the CPU or CPUs to service hardware interrupts.
%soft Show the percentage of time spent by the CPU or CPUs to service software interrupts.
%steal Show the percentage of time spent in involuntary wait by the virtual CPU or CPUs while the hypervisor was servicing another virtual processor.
%guest Show the percentage of time spent by the CPU or CPUs to run a virtual processor.
%gnice Show the percentage of time spent by the CPU or CPUs to run a niced guest.
%idle Show the percentage of time that the CPU or CPUs were idle and the system did not have an outstanding disk I/O request.
