安装perf
yum install perf -y
命令示例
查看所有进程的压力perf top
Samples: 2K of event 'cycles', Event count (approx.): 1113901234
Overhead Shared Object Symbol
4.73% perf [.] rb_next
3.15% perf [.] __symbols__insert
1.96% [kernel] [k] module_get_kallsym
1.58% [kernel] [k] kallsyms_expand_symbol.constprop.1
1.55% prometheus2 [.] github.com/prometheus/tsdb/chunkenc.(*bstream).readByte
1.34% prometheus2 [.] github.com/prometheus/tsdb/chunkenc.(*xorIterator).readValue
查看所有进程的压力，从大到小排列：perf top --sort comm,dso
Samples: 271K of event 'cycles', Event count (approx.): 110876431070
Overhead Command Shared Object
27.59% mysqld mysqld
10.24% CPU 0/KVM [kernel]
8.52% swapper [kernel]
8.08% java perf-47037.map
7.23% prometheus2 prometheus2
6.12% CPU 3/KVM [kernel]
6.04% CPU 2/KVM [kernel]
5.56% zsn-agent [kernel]
3.68% vhost-8837 [kernel]
2.54% mysqld [kernel]
2.14% vhost-2561 [kernel]
1.22% CPU 1/KVM [kernel]
1.19% java [kernel]
1.09% mysqld libc-2.17.so
0.86% perf perf
0.86% collectd_export collectd_exporter
0.83% zsn-agent zsn-agent (deleted)
0.68% CPU 2/KVM libpthread-2.17.so
0.66% CPU 3/KVM libpthread-2.17.so
先用top 命令查看系统压力：
[root@dell-emc36-172-24-0-103 ~]# top
top - 20:44:03 up 23 days, 4:39, 5 users, load average: 14.84, 18.75, 20.44
Tasks: 853 total, 1 running, 476 sleeping, 0 stopped, 0 zombie
%Cpu(s): 9.1 us, 8.0 sy, 0.0 ni, 81.6 id, 1.2 wa, 0.0 hi, 0.1 si, 0.0 st
KiB Mem : 79105868+total, 17245459+free, 15466398+used, 46394016+buff/cache
KiB Swap: 0 total, 0 free, 0 used. 62571686+avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
8837 root 20 0 5103944 1.296g 22460 S 224.8 0.2 60590:41 qemu-kvm
48935 root 20 0 7919108 5.926g 22996 S 160.3 0.8 59:08.75 qemu-kvm
51265 root 20 0 7916908 5.597g 23004 S 137.7 0.7 70:10.98 qemu-kvm
12640 root 20 0 8115684 6.458g 23344 S 124.5 0.9 158:11.78 qemu-kvm
63927 root 20 0 2696888 2.026g 8924 S 100.3 0.3 418:13.65 zsn-agent
45249 root 20 0 128216 69148 10120 S 88.1 0.0 56:17.21 node_exporter
61557 root 20 0 13.812g 8.934g 41208 S 45.7 1.2 583:17.91 prometheus2
43633 root 20 0 7927984 6.453g 23032 S 29.1 0.9 62:29.10 qemu-kvm
47412 root 20 0 9431284 7.942g 23120 S 22.5 1.1 10:16.63 qemu-kvm
65068 mysql 20 0 23.114g 2.922g 15484 S 19.5 0.4 2731:38 mysqld
45058 root 20 0 47992 34268 7000 S 13.9 0.0 26:23.77 collectd_export
42307 root 20 0 9423412 7.942g 23132 S 13.6 1.1 9:45.67 qemu-kvm
37193 root 20 0 13.054g 9.231g 23096 S 10.6 1.2 17:57.15 qemu-kvm
52104 root 20 0 13.111g 1.215g 22988 S 9.3 0.2 0:40.13 qemu-kvm
8846 root 20 0 0 0 0 S 7.6 0.0 4530:38 vhost-8837
44072 root 20 0 2149980 48512 21236 S 7.6 0.0 12:33.94 libvirtd
查看某个进程的信息：perf top -p 2742
Samples: 2K of event 'cycles', Event count (approx.): 284064238
Overhead Shared O Symbol
12.93% [kernel] [k] ipt_do_table
7.67% [kernel] [k] copy_user_enhanced_fast_string
5.03% [kernel] [k] ebt_do_table
3.81% [kernel] [k] vhost_get_vq_desc
3.19% [kernel] [k] update_load_avg
1.84% [kernel] [k] update_curr
1.78% [kernel] [k] vhost_worker
1.75% [kernel] [k] copy_user_generic_unrolled
1.53% [kernel] [k] vhost_notify.isra.39
1.53% [kernel] [k] _raw_read_lock_bh
1.35% [kernel] [k] copy_page_to_iter
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