Docker CPU 资源限制——CPU分片功能测试

  之前的一篇随笔——Docker CPU 资源限制 中介绍了针对COU的某个或某几个核的控制,今天介绍下CPU分片功能,即COU占比。

测试步骤

  1、下载CPU测试image。agileek/cpuset-test给出了一种用于测试CPU的image,功能就是将CPU资源用满.

$ docker pull agileek/cpuset-test

  2、观察未开任何应用时的CPU占用情况

[root@elk ~]# mpstat -P ALL 5 10
Linux 3.10.0-123.el7.x86_64 (elk)     02/16/2016     _x86_64_    (8 CPU)

08:10:57 AM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest  %gnice   %idle
08:11:02 AM  all    0.05    0.00    0.13    0.00    0.00    0.00    0.00    0.00    0.00   99.82
08:11:02 AM    0    0.20    0.00    0.20    0.00    0.00    0.00    0.00    0.00    0.00   99.60
08:11:02 AM    1    0.00    0.00    0.20    0.00    0.00    0.00    0.00    0.00    0.00   99.80
08:11:02 AM    2    0.20    0.00    0.20    0.00    0.00    0.00    0.00    0.00    0.00   99.60
08:11:02 AM    3    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
08:11:02 AM    4    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
08:11:02 AM    5    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  100.00
08:11:02 AM    6    0.00    0.00    0.20    0.00    0.00    0.00    0.00    0.00    0.00   99.80
08:11:02 AM    7    0.20    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00   99.80
[root@elk ~]# top top - 08:22:48 up 27 days, 20:31,  4 users,  load average: 2.18, 7.36, 4.61 Tasks: 216 total,   1 running, 215 sleeping,   0 stopped,   0 zombie %Cpu(s):  0.0 us,  0.1 sy,  0.0 ni, 99.8 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st KiB Mem: 16151132 total,  3742548 used, 12408584 free,     6392 buffers KiB Swap: 8200188 total,        0 used,  8200188 free.  1847800 cached Mem PID USER PR NI VIRT RES SHR S %CPU %MEM     TIME+ COMMAND 11373 logstash  39  19 8087940 457188  15804 S  0.7  2.8 145:09.16 java 482 root      20   0       0      0      0 S  0.3  0.0  29:06.19 xfsaild/dm-1                                                                                                                
31713 elastic+  20   0 5797384 269444  14436 S  0.3  1.7 155:43.65 java 1 root      20   0   50684   4488   2336 S  0.0  0.0   0:32.37 systemd 2 root      20   0       0      0      0 S  0.0  0.0   0:00.45 kthreadd 3 root      20   0       0      0      0 S  0.0  0.0   0:04.83 ksoftirqd/0                                                                                                                 
    5 root       0 -20       0      0      0 S  0.0  0.0   0:00.00 kworker/0:0H 7 root      rt   0       0      0      0 S  0.0  0.0   0:00.50 migration/0                                                                                                                 
    8 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcu_bh 9 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/0                                                                                                                     
   10 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/1                                                                                                                     
   11 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/2                                                                                                                     
   12 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/3                                                                                                                     
   13 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/4                                                                                                                     
   14 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/5                                                                                                                     
   15 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/6                                                                                                                     
   16 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/7                                                                                                                     
   17 root      20   0       0      0      0 S  0.0  0.0  16:09.47 rcu_sched 18 root      20   0       0      0      0 S  0.0  0.0   1:01.54 rcuos/0                                                                                                                     
   19 root      20   0       0      0      0 S  0.0  0.0   0:53.77 rcuos/1                                                                                                                     
   20 root      20   0       0      0      0 S  0.0  0.0   1:00.50 rcuos/2                                                                                                                     
   21 root      20   0       0      0      0 S  0.0  0.0   0:53.75 rcuos/3                                                                                                                     
   22 root      20   0       0      0      0 S  0.0  0.0   0:55.59 rcuos/4                                                                                                                     
   23 root      20   0       0      0      0 S  0.0  0.0   0:44.15 rcuos/5                                                                                                                     
   24 root      20   0       0      0      0 S  0.0  0.0   0:53.57 rcuos/6                                       

 

  3、开启一个容器,占CPU比重为1000,并观察CPU使用情况

[root@elk ~]# docker run -it --rm -c 1000 agileek/cpuset-test
Burning 8 CPUs/cores

另开终端观察CPU占用情况

[root@elk ~]# top
top - 08:14:33 up 27 days, 20:22,  4 users,  load average: 7.26, 3.04, 1.18
Tasks: 220 total,   1 running, 219 sleeping,   0 stopped,   0 zombie
%Cpu(s):100.0 us,  0.0 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:  16151132 total,  3745232 used, 12405900 free,     6508 buffers
KiB Swap:  8200188 total,        0 used,  8200188 free.  1849724 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                                                     
17258 root 20 0 36732 936 564 S 800.0 0.0 19:13.78 cpuburn  
17218 root      20   0       0      0      0 S   0.3  0.0   0:00.02 kworker/0:2                                                                                                                 
17348 root      20   0  123680   1724   1148 R   0.3  0.0   0:00.01 top                                                                                                                         
    1 root      20   0   50684   4488   2336 S   0.0  0.0   0:32.35 systemd                                                                                                                     
    2 root      20   0       0      0      0 S   0.0  0.0   0:00.45 kthreadd                                                                                                                    
    3 root      20   0       0      0      0 S   0.0  0.0   0:04.83 ksoftirqd/0                                                                                                                 
    5 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:0H                                                                                                                
    7 root      rt   0       0      0      0 S   0.0  0.0   0:00.50 migration/0                                                                                                                 
    8 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcu_bh                                                                                                                      
    9 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/0                                                                                                                     
   10 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/1                                                                                                                     
   11 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/2                                                                                                                     
   12 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/3                                                                                                                     
   13 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/4                                                                                                                     
   14 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/5                                                                                                                     
   15 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/6                            

 此时可以看到,PID17258的进程(也就是我们刚刚开启的docker容器)CPU占到了全部8颗CPU的100%,也就是800%。

  4、再开启一个容器,占CPU比重为3000,并观察CPU使用情况

[root@elk ~]# docker run -it --rm -c 3000 agileek/cpuset-test
Burning 8 CPUs/cores

另开终端观察CPU占用情况

[root@elk ~]# top
top - 08:17:35 up 27 days, 20:25,  4 users,  load average: 11.86, 6.29, 2.72
Tasks: 227 total,   2 running, 225 sleeping,   0 stopped,   0 zombie
%Cpu(s):100.0 us,  0.0 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:  16151132 total,  3752724 used, 12398408 free,     6624 buffers
KiB Swap:  8200188 total,        0 used,  8200188 free.  1851692 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                                                     
17494 root 20 0 36732 932 560 S 602.1 0.0 3:54.95 cpuburn 17258 root 20 0 36732 936 564 S 197.9 0.0 39:34.78 cpuburn  927 root      20   0   19112   1168    948 S   0.3  0.0   3:04.34 irqbalance                                                                                                                  
17532 root      20   0  123680   1732   1148 R   0.3  0.0   0:00.01 top                                                                                                                         
    1 root      20   0   50684   4488   2336 S   0.0  0.0   0:32.36 systemd                                                                                                                     
    2 root      20   0       0      0      0 S   0.0  0.0   0:00.45 kthreadd                                                                                                                    
    3 root      20   0       0      0      0 S   0.0  0.0   0:04.83 ksoftirqd/0                                                                                                                 
    5 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 kworker/0:0H                                                                                                                
    7 root      rt   0       0      0      0 S   0.0  0.0   0:00.50 migration/0                                                                                                                 
    8 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcu_bh                                                                                                                      
    9 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/0                                                                                                                     
   10 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/1                                                                                                                     
   11 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/2                                                                                                                     
   12 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/3                                                                                                                     
   13 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/4                                                                                                                     
   14 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/5                                                                                                                     
   15 root      20   0       0      0      0 S   0.0  0.0   0:00.00 rcuob/6           

  此时可以看到,PID17258的进程(我们开启的第一个docker容器)CPU占到了全部8颗CPU的1/4,也就是200%。而新开启的,占比3000的docker容器站到了全部8颗CPU的3/4,也就是600%。

 

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