環境說明

Centos6.8 x86_64

使用說明

很多時候我們需要檢視各進行對於硬體資源的佔用情況，譬如說CPU、Memory、Disk，在Centos6下可以通過pidstat可以檢視進行對各資源的佔用情況。

[[email protected] ~]# pidstat --help
Usage: pidstat [ options ] [ <interval> [ <count> ] ]
Options are:
[ -C <command> ] [ -d ] [ -h ] [ -I ] [ -l ] [ -r ] [ -t ] [ -u ] [ -V ] [ -w ]
[ -p { <pid> [,...] | SELF | ALL } ] [ -T { TASK | CHILD | ALL } ]
 

      pidstat後面可以跟很多引數，但是最常用的分別是：  -u：監控cpu  -r：監控記憶體  -d：監控硬碟     我們先來通過pidstat檢視各進行佔用cpu資源情況，後面的引數“1”，為顯示列表的時間間隔，為1秒。

[[email protected] ~]# pidstat -u 1
Linux 2.6.32-642.4.2.el6.x86_64 (ovirt-host-2)  10/13/2016      _x86_64_        (8 CPU)

11:04:20 AM       PID    %usr %system  %guest    %CPU   CPU  Command
11:04:21 AM      3428    5.77    0.96    0.00    6.73     3  vdsm
11:04:21 AM      4637   13.46   10.58    0.00   24.04     1  sshd
11:04:21 AM      4639    1.92    3.85    0.00    5.77     3  virt-p2v-server
11:04:21 AM      4864    1.92    1.92    0.00    3.85     2  pidstat
11:04:21 AM     12080    0.96    2.88    0.00    3.85     2  pidstat

11:04:21 AM       PID    %usr %system  %guest    %CPU   CPU  Command
11:04:22 AM      4637   15.00    9.00    0.00   24.00     1  sshd
11:04:22 AM      4639    3.00    3.00    0.00    6.00     3  virt-p2v-server
11:04:22 AM      4864    0.00    2.00    0.00    2.00     2  pidstat
11:04:22 AM     12080    2.00    2.00    0.00    4.00     6  pidstat

11:04:22 AM       PID    %usr %system  %guest    %CPU   CPU  Command
11:04:23 AM       125    0.00    1.00    0.00    1.00     2  kswapd0
11:04:23 AM      2863    1.00    1.00    0.00    2.00     2  libvirtd
11:04:23 AM      3428    1.00    0.00    0.00    1.00     3  vdsm
11:04:23 AM      4637   14.00   10.00    0.00   24.00     1  sshd
11:04:23 AM      4639    2.00    4.00    0.00    6.00     3  virt-p2v-server
11:04:23 AM      4864    2.00    2.00    0.00    4.00     4  pidstat
11:04:23 AM     12080    1.00    2.00    0.00    3.00     2  pidstat
 

可以通過man pidstat中-u的內容，來了解上述列表中各引數的含義

   -u     Report CPU utilization.

              When reporting statistics for individual tasks, the following values are displayed:

              PID
                     The identification number of the task being monitored.

              %usr
                     Percentage of CPU used by the task while executing at the user level (application), with or without nice priority. Note that this field does NOT include time spent running a virtual processor.

              %system
                     Percentage of CPU used by the task while executing at the system level (kernel).

              %guest
                     Percentage of CPU spent by the task in virtual machine (running a virtual processor).

              %CPU
                     Total percentage of CPU time used by the task. In an SMP environment, the task鈙 CPU usage will be divided by the total number of CPU鈙 if option -I has been entered on the command line.

              CPU
                     Processor number to which the task is attached.

              Command
                     The command name of the task.
 

瞭解檢視cpu後，我們再來看看檢視記憶體

Linux 2.6.32-642.4.2.el6.x86_64 (ovirt-host-2)  10/13/2016      _x86_64_        (8 CPU)

11:07:57 AM       PID  minflt/s  majflt/s     VSZ    RSS   %MEM  Command
11:07:58 AM      3428     12.62      0.00 2030068  42408   0.26  vdsm
11:07:58 AM      4864    619.42      0.00  101380   1216   0.01  pidstat
11:07:58 AM     12143    621.36      0.00  101384   1192   0.01  pidstat

11:07:58 AM       PID  minflt/s  majflt/s     VSZ    RSS   %MEM  Command
11:07:59 AM      1860      9.00      0.00   18372    800   0.00  irqbalance
11:07:59 AM      2863      2.00      0.00  933520  10356   0.06  libvirtd
11:07:59 AM      3428     76.00      0.00 2030068  42408   0.26  vdsm
11:07:59 AM      4864    638.00      0.00  101380   1216   0.01  pidstat
11:07:59 AM     12143    646.00      0.00  101384   1224   0.01  pidstat

一樣，通過man pidstat來檢視各引數的含義

       -r     Report page faults and memory utilization.

              When reporting statistics for individual tasks, the following values are displayed:

              PID
                     The identification number of the task being monitored.

              minflt/s
                     Total number of minor faults the task has made per second, those which have not required loading a memory page from disk.

              majflt/s
                     Total number of major faults the task has made per second, those which have required loading a memory page from disk.

              VSZ
                     Virtual Size: The virtual memory usage of entire task in kilobytes.

              RSS
                     Resident Set Size: The non-swapped physical memory used by the task in kilobytes.

              Command
                     The command name of the task.

下面我們來檢視監控disk

[[email protected] ~]# pidstat -d 1
Linux 2.6.32-642.4.2.el6.x86_64 (ovirt-host-2)  10/13/2016      _x86_64_        (8 CPU)

11:12:29 AM       PID   kB_rd/s   kB_wr/s kB_ccwr/s  Command
11:12:31 AM      4639      0.00  11592.45      0.00  virt-p2v-server

11:12:31 AM       PID   kB_rd/s   kB_wr/s kB_ccwr/s  Command
11:12:32 AM      4639      0.00   8192.00      0.00  virt-p2v-server

11:12:32 AM       PID   kB_rd/s   kB_wr/s kB_ccwr/s  Command
11:12:33 AM      4639      0.00  12288.00      0.00  virt-p2v-server

11:12:33 AM       PID   kB_rd/s   kB_wr/s kB_ccwr/s  Command
11:12:34 AM      4639      0.00  12288.00      0.00  virt-p2v-server

11:12:34 AM       PID   kB_rd/s   kB_wr/s kB_ccwr/s  Command
11:12:35 AM      4639      0.00  12288.00      0.00  virt-p2v-server

檢視各引數的含義

    -d     Report I/O statistics (kernels 2.6.20 and later only).  The following values are displayed:

              PID
                     The identification number of the task being monitored.

              kB_rd/s
                     Number of kilobytes the task has caused to be read from disk per second.

              kB_wr/s
                     Number of kilobytes the task has caused, or shall cause to be written to disk per second.

              kB_ccwr/s
                     Number of kilobytes whose writing to disk has been cancelled by the task. This may occur when the task truncates some dirty pagecache. In this case, some IO which another task has been accounted for will not be  happening.

              Command
                     The command name of the task.