https://www.cnblogs.com/liuq/p/5623565.html
全面了解 Linux 服务器 - 1. 查看 Linux 服务器的 CPU 详细情况
ubuntu下查看服务器的CPU详细情况
大文实验室/大文哥
壹捌陆捌零陆捌捌陆捌贰
21504965 AT qq.com
完成时间：2017/12/11 14:08
版本：V1.0
Posted on 2016-06-28 15:16 刘[小]倩 阅读(681) 评论(0) 编辑 收藏
1. 查看 Linux 服务器的 CPU 详细情况
判断依据：
具有相同的 core id 的 CPU 是同一个 core 超线程。
具有相同的 physical id 的 CPU 是同一个 CPU 封装的线程或核心。
显示物理 CPU 个数的命令：
[email protected]:~$ cat /proc/cpuinfo | grep ‘physical id‘ | sort| uniq | wc -l
1
[email protected]:~$
[email protected]:~$ cat /proc/cpuinfo | grep ‘physical id‘ | sort| uniq | wc -l
1
[email protected]:~$
显示每个物理 CPU 中 core 的个数（即核数）：
[email protected]:~$ cat /proc/cpuinfo | grep ‘cpu cores‘ | uniq
cpu cores : 1
[email protected]:~$
[email protected]:~$ cat /proc/cpuinfo | grep ‘cpu cores‘ | uniq
cpu cores : 6
[email protected]:~$
显示逻辑 CPU 的个数：
[email protected]:~$ cat /proc/cpuinfo | grep ‘processor‘ | wc -l
1
[email protected]:~$
[email protected]:~$ cat /proc/cpuinfo | grep ‘processor‘ | wc -l
12
[email protected]:~$
按理说有如下等式：物理CPU个数 × 核数 = 逻辑CPU的个数
如果不相等的话，则表示你的服务器 CPU 支持超线程技术。在配置服务器的应用时，应以服务器的逻辑 CPU 个数为准。
查看系统内核版本号：
[email protected]:~$ uname -a
Linux ubuntu 4.2.0-38-generic #45-Ubuntu SMP Wed Jun 8 21:21:49 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
[email protected]:~$
[email protected]:~$ uname -a
Linux cm-System-Product-Name 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
[email protected]:~$
[email protected]:~$
[email protected]:~$ cat /etc/issue
Ubuntu 14.04.5 LTS \n \l
[email protected]:~$
【附加FreeBSD相关命令】
显示 CPU 个数：
[[email protected] ~]$ dmesg|grep cpu
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
acpi_throttle0: <ACPI CPU Throttling> on cpu0
acpi_throttle1: <ACPI CPU Throttling> on cpu1
[email protected]:~$
[email protected]:~$ dmesg|grep cpu
[ 0.000000] Initializing cgroup subsys cpuset
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Initializing cgroup subsys cpuacct
[ 0.000000] KERNEL supported cpus:
[ 0.000000] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
[ 0.000000] setup_percpu: NR_CPUS:256 nr_cpumask_bits:256 nr_cpu_ids:12 nr_node_ids:1
[ 0.000000] PERCPU: Embedded 29 pages/cpu @ffff88043fc00000 s86336 r8192 d24256 u131072
[ 0.000000] pcpu-alloc: s86336 r8192 d24256 u131072 alloc=1*2097152
[ 0.000000] pcpu-alloc: [0] 00 01 02 03 04 05 06 07 08 09 10 11 -- -- -- --
[ 0.000000] RCU restricting CPUs from NR_CPUS=256 to nr_cpu_ids=12.
[ 0.249748] cpuidle: using governor ladder
[ 0.249749] cpuidle: using governor menu
[ 0.948257] ledtrig-cpu: registered to indicate activity on CPUs
[email protected]:~$
[[email protected] ~]$ sysctl -a|grep cpu
cpu HAMMER
device cpufreq
kern.sched.cpusetsize: 8
<cpu count="2" mask="3">0, 1</cpu>
<cpu count="2" mask="3">0, 1</cpu>
kern.ccpu: 0
kern.smp.maxcpus: 64
kern.smp.cpus: 2
net.inet.tcp.per_cpu_timers: 0
debug.acpi.cpu_unordered: 0
debug.cpufreq.lowest: 0
debug.cpufreq.verbose: 0
hw.ncpu: 2
......
从上面可以看出 CPU 个数为 2
[email protected]:~$
[email protected]:~$ sysctl -a|grep cpu
sysctl: permission denied on key ‘fs.protected_hardlinks‘
sysctl: permission denied on key ‘fs.protected_symlinks‘
sysctl: permission denied on key ‘kernel.cad_pid‘
kernel.perf_cpu_time_max_percent = 25
kernel.sched_domain.cpu0.domain0.busy_factor = 64
kernel.sched_domain.cpu0.domain0.busy_idx = 0
kernel.sched_domain.cpu0.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu0.domain0.flags = 687
kernel.sched_domain.cpu0.domain0.forkexec_idx = 0
kernel.sched_domain.cpu0.domain0.idle_idx = 0
kernel.sched_domain.cpu0.domain0.imbalance_pct = 110
kernel.sched_domain.cpu0.domain0.max_interval = 2
kernel.sched_domain.cpu0.domain0.min_interval = 1
kernel.sched_domain.cpu0.domain0.name = SIBLING
kernel.sched_domain.cpu0.domain0.newidle_idx = 0
kernel.sched_domain.cpu0.domain0.wake_idx = 0
kernel.sched_domain.cpu0.domain1.busy_factor = 64
kernel.sched_domain.cpu0.domain1.busy_idx = 2
kernel.sched_domain.cpu0.domain1.cache_nice_tries = 1
kernel.sched_domain.cpu0.domain1.flags = 559
kernel.sched_domain.cpu0.domain1.forkexec_idx = 0
kernel.sched_domain.cpu0.domain1.idle_idx = 0
kernel.sched_domain.cpu0.domain1.imbalance_pct = 125
kernel.sched_domain.cpu0.domain1.max_interval = 4
kernel.sched_domain.cpu0.domain1.min_interval = 1
kernel.sched_domain.cpu0.domain1.name = MC
kernel.sched_domain.cpu0.domain1.newidle_idx = 0
kernel.sched_domain.cpu0.domain1.wake_idx = 0
kernel.sched_domain.cpu1.domain0.busy_factor = 64
kernel.sched_domain.cpu1.domain0.busy_idx = 0
kernel.sched_domain.cpu1.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu1.domain0.flags = 687
kernel.sched_domain.cpu1.domain0.forkexec_idx = 0
kernel.sched_domain.cpu1.domain0.idle_idx = 0
kernel.sched_domain.cpu1.domain0.imbalance_pct = 110
kernel.sched_domain.cpu1.domain0.max_interval = 2
kernel.sched_domain.cpu1.domain0.min_interval = 1
kernel.sched_domain.cpu1.domain0.name = SIBLING
kernel.sched_domain.cpu1.domain0.newidle_idx = 0
kernel.sched_domain.cpu1.domain0.wake_idx = 0
kernel.sched_domain.cpu1.domain1.busy_factor = 64
kernel.sched_domain.cpu1.domain1.busy_idx = 2
kernel.sched_domain.cpu1.domain1.cache_nice_tries = 1
kernel.sched_domain.cpu1.domain1.flags = 559
kernel.sched_domain.cpu1.domain1.forkexec_idx = 0
kernel.sched_domain.cpu1.domain1.idle_idx = 0
kernel.sched_domain.cpu1.domain1.imbalance_pct = 125
kernel.sched_domain.cpu1.domain1.max_interval = 4
kernel.sched_domain.cpu1.domain1.min_interval = 1
kernel.sched_domain.cpu1.domain1.name = MC
kernel.sched_domain.cpu1.domain1.newidle_idx = 0
kernel.sched_domain.cpu1.domain1.wake_idx = 0
kernel.sched_domain.cpu10.domain0.busy_factor = 64
kernel.sched_domain.cpu10.domain0.busy_idx = 0
kernel.sched_domain.cpu10.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu10.domain0.flags = 687
kernel.sched_domain.cpu10.domain0.forkexec_idx = 0
kernel.sched_domain.cpu10.domain0.idle_idx = 0
kernel.sched_domain.cpu10.domain0.imbalance_pct = 110
kernel.sched_domain.cpu10.domain0.max_interval = 2
kernel.sched_domain.cpu10.domain0.min_interval = 1
kernel.sched_domain.cpu10.domain0.name = SIBLING
kernel.sched_domain.cpu10.domain0.newidle_idx = 0
kernel.sched_domain.cpu10.domain0.wake_idx = 0
kernel.sched_domain.cpu10.domain1.busy_factor = 64
kernel.sched_domain.cpu10.domain1.busy_idx = 2
kernel.sched_domain.cpu10.domain1.cache_nice_tries = 1
kernel.sched_domain.cpu10.domain1.flags = 559
kernel.sched_domain.cpu10.domain1.forkexec_idx = 0
kernel.sched_domain.cpu10.domain1.idle_idx = 0
kernel.sched_domain.cpu10.domain1.imbalance_pct = 125
kernel.sched_domain.cpu10.domain1.max_interval = 4
kernel.sched_domain.cpu10.domain1.min_interval = 1
kernel.sched_domain.cpu10.domain1.name = MC
kernel.sched_domain.cpu10.domain1.newidle_idx = 0
kernel.sched_domain.cpu10.domain1.wake_idx = 0
kernel.sched_domain.cpu11.domain0.busy_factor = 64
kernel.sched_domain.cpu11.domain0.busy_idx = 0
kernel.sched_domain.cpu11.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu11.domain0.flags = 687
kernel.sched_domain.cpu11.domain0.forkexec_idx = 0
kernel.sched_domain.cpu11.domain0.idle_idx = 0
kernel.sched_domain.cpu11.domain0.imbalance_pct = 110
kernel.sched_domain.cpu11.domain0.max_interval = 2
kernel.sched_domain.cpu11.domain0.min_interval = 1
kernel.sched_domain.cpu11.domain0.name = SIBLING
kernel.sched_domain.cpu11.domain0.newidle_idx = 0
kernel.sched_domain.cpu11.domain0.wake_idx = 0
kernel.sched_domain.cpu11.domain1.busy_factor = 64
kernel.sched_domain.cpu11.domain1.busy_idx = 2
kernel.sched_domain.cpu11.domain1.cache_nice_tries = 1
kernel.sched_domain.cpu11.domain1.flags = 559
kernel.sched_domain.cpu11.domain1.forkexec_idx = 0
kernel.sched_domain.cpu11.domain1.idle_idx = 0
kernel.sched_domain.cpu11.domain1.imbalance_pct = 125
kernel.sched_domain.cpu11.domain1.max_interval = 4
kernel.sched_domain.cpu11.domain1.min_interval = 1
kernel.sched_domain.cpu11.domain1.name = MC
kernel.sched_domain.cpu11.domain1.newidle_idx = 0
kernel.sched_domain.cpu11.domain1.wake_idx = 0
kernel.sched_domain.cpu2.domain0.busy_factor = 64
kernel.sched_domain.cpu2.domain0.busy_idx = 0
kernel.sched_domain.cpu2.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu2.domain0.flags = 687
kernel.sched_domain.cpu2.domain0.forkexec_idx = 0
kernel.sched_domain.cpu2.domain0.idle_idx = 0
kernel.sched_domain.cpu2.domain0.imbalance_pct = 110
kernel.sched_domain.cpu2.domain0.max_interval = 2
kernel.sched_domain.cpu2.domain0.min_interval = 1
kernel.sched_domain.cpu2.domain0.name = SIBLING
kernel.sched_domain.cpu2.domain0.newidle_idx = 0
kernel.sched_domain.cpu2.domain0.wake_idx = 0
kernel.sched_domain.cpu2.domain1.busy_factor = 64
kernel.sched_domain.cpu2.domain1.busy_idx = 2
kernel.sched_domain.cpu2.domain1.cache_nice_tries = 1
kernel.sched_domain.cpu2.domain1.flags = 559
kernel.sched_domain.cpu2.domain1.forkexec_idx = 0
kernel.sched_domain.cpu2.domain1.idle_idx = 0
kernel.sched_domain.cpu2.domain1.imbalance_pct = 125
kernel.sched_domain.cpu2.domain1.max_interval = 4
kernel.sched_domain.cpu2.domain1.min_interval = 1
kernel.sched_domain.cpu2.domain1.name = MC
kernel.sched_domain.cpu2.domain1.newidle_idx = 0
kernel.sched_domain.cpu2.domain1.wake_idx = 0
kernel.sched_domain.cpu3.domain0.busy_factor = 64
kernel.sched_domain.cpu3.domain0.busy_idx = 0
kernel.sched_domain.cpu3.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu3.domain0.flags = 687
kernel.sched_domain.cpu3.domain0.forkexec_idx = 0
kernel.sched_domain.cpu3.domain0.idle_idx = 0
kernel.sched_domain.cpu3.domain0.imbalance_pct = 110
kernel.sched_domain.cpu3.domain0.max_interval = 2
kernel.sched_domain.cpu3.domain0.min_interval = 1
kernel.sched_domain.cpu3.domain0.name = SIBLING
kernel.sched_domain.cpu3.domain0.newidle_idx = 0
kernel.sched_domain.cpu3.domain0.wake_idx = 0
kernel.sched_domain.cpu3.domain1.busy_factor = 64
kernel.sched_domain.cpu3.domain1.busy_idx = 2
kernel.sched_domain.cpu3.domain1.cache_nice_tries = 1
kernel.sched_domain.cpu3.domain1.flags = 559
kernel.sched_domain.cpu3.domain1.forkexec_idx = 0
kernel.sched_domain.cpu3.domain1.idle_idx = 0
kernel.sched_domain.cpu3.domain1.imbalance_pct = 125
kernel.sched_domain.cpu3.domain1.max_interval = 4
kernel.sched_domain.cpu3.domain1.min_interval = 1
kernel.sched_domain.cpu3.domain1.name = MC
kernel.sched_domain.cpu3.domain1.newidle_idx = 0
kernel.sched_domain.cpu3.domain1.wake_idx = 0
kernel.sched_domain.cpu4.domain0.busy_factor = 64
kernel.sched_domain.cpu4.domain0.busy_idx = 0
kernel.sched_domain.cpu4.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu4.domain0.flags = 687
kernel.sched_domain.cpu4.domain0.forkexec_idx = 0
kernel.sched_domain.cpu4.domain0.idle_idx = 0
kernel.sched_domain.cpu4.domain0.imbalance_pct = 110
kernel.sched_domain.cpu4.domain0.max_interval = 2
kernel.sched_domain.cpu4.domain0.min_interval = 1
kernel.sched_domain.cpu4.domain0.name = SIBLING
kernel.sched_domain.cpu4.domain0.newidle_idx = 0
kernel.sched_domain.cpu4.domain0.wake_idx = 0
kernel.sched_domain.cpu4.domain1.busy_factor = 64
kernel.sched_domain.cpu4.domain1.busy_idx = 2
kernel.sched_domain.cpu4.domain1.cache_nice_tries = 1
kernel.sched_domain.cpu4.domain1.flags = 559
kernel.sched_domain.cpu4.domain1.forkexec_idx = 0
kernel.sched_domain.cpu4.domain1.idle_idx = 0
kernel.sched_domain.cpu4.domain1.imbalance_pct = 125
kernel.sched_domain.cpu4.domain1.max_interval = 4
kernel.sched_domain.cpu4.domain1.min_interval = 1
kernel.sched_domain.cpu4.domain1.name = MC
kernel.sched_domain.cpu4.domain1.newidle_idx = 0
kernel.sched_domain.cpu4.domain1.wake_idx = 0
kernel.sched_domain.cpu5.domain0.busy_factor = 64
kernel.sched_domain.cpu5.domain0.busy_idx = 0
kernel.sched_domain.cpu5.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu5.domain0.flags = 687
kernel.sched_domain.cpu5.domain0.forkexec_idx = 0
kernel.sched_domain.cpu5.domain0.idle_idx = 0
kernel.sched_domain.cpu5.domain0.imbalance_pct = 110
kernel.sched_domain.cpu5.domain0.max_interval = 2
kernel.sched_domain.cpu5.domain0.min_interval = 1
kernel.sched_domain.cpu5.domain0.name = SIBLING
kernel.sched_domain.cpu5.domain0.newidle_idx = 0
kernel.sched_domain.cpu5.domain0.wake_idx = 0
kernel.sched_domain.cpu5.domain1.busy_factor = 64
kernel.sched_domain.cpu5.domain1.busy_idx = 2
kernel.sched_domain.cpu5.domain1.cache_nice_tries = 1
kernel.sched_domain.cpu5.domain1.flags = 559
kernel.sched_domain.cpu5.domain1.forkexec_idx = 0
kernel.sched_domain.cpu5.domain1.idle_idx = 0
kernel.sched_domain.cpu5.domain1.imbalance_pct = 125
kernel.sched_domain.cpu5.domain1.max_interval = 4
kernel.sched_domain.cpu5.domain1.min_interval = 1
kernel.sched_domain.cpu5.domain1.name = MC
kernel.sched_domain.cpu5.domain1.newidle_idx = 0
kernel.sched_domain.cpu5.domain1.wake_idx = 0
kernel.sched_domain.cpu6.domain0.busy_factor = 64
kernel.sched_domain.cpu6.domain0.busy_idx = 0
kernel.sched_domain.cpu6.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu6.domain0.flags = 687
kernel.sched_domain.cpu6.domain0.forkexec_idx = 0
kernel.sched_domain.cpu6.domain0.idle_idx = 0
kernel.sched_domain.cpu6.domain0.imbalance_pct = 110
kernel.sched_domain.cpu6.domain0.max_interval = 2
kernel.sched_domain.cpu6.domain0.min_interval = 1
kernel.sched_domain.cpu6.domain0.name = SIBLING
kernel.sched_domain.cpu6.domain0.newidle_idx = 0
kernel.sched_domain.cpu6.domain0.wake_idx = 0
kernel.sched_domain.cpu6.domain1.busy_factor = 64
kernel.sched_domain.cpu6.domain1.busy_idx = 2
kernel.sched_domain.cpu6.domain1.cache_nice_tries = 1
kernel.sched_domain.cpu6.domain1.flags = 559
kernel.sched_domain.cpu6.domain1.forkexec_idx = 0
kernel.sched_domain.cpu6.domain1.idle_idx = 0
kernel.sched_domain.cpu6.domain1.imbalance_pct = 125
kernel.sched_domain.cpu6.domain1.max_interval = 4
kernel.sched_domain.cpu6.domain1.min_interval = 1
kernel.sched_domain.cpu6.domain1.name = MC
kernel.sched_domain.cpu6.domain1.newidle_idx = 0
kernel.sched_domain.cpu6.domain1.wake_idx = 0
kernel.sched_domain.cpu7.domain0.busy_factor = 64
kernel.sched_domain.cpu7.domain0.busy_idx = 0
kernel.sched_domain.cpu7.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu7.domain0.flags = 687
kernel.sched_domain.cpu7.domain0.forkexec_idx = 0
kernel.sched_domain.cpu7.domain0.idle_idx = 0
kernel.sched_domain.cpu7.domain0.imbalance_pct = 110
kernel.sched_domain.cpu7.domain0.max_interval = 2
kernel.sched_domain.cpu7.domain0.min_interval = 1
kernel.sched_domain.cpu7.domain0.name = SIBLING
kernel.sched_domain.cpu7.domain0.newidle_idx = 0
kernel.sched_domain.cpu7.domain0.wake_idx = 0
kernel.sched_domain.cpu7.domain1.busy_factor = 64
kernel.sched_domain.cpu7.domain1.busy_idx = 2
kernel.sched_domain.cpu7.domain1.cache_nice_tries = 1
kernel.sched_domain.cpu7.domain1.flags = 559
kernel.sched_domain.cpu7.domain1.forkexec_idx = 0
kernel.sched_domain.cpu7.domain1.idle_idx = 0
kernel.sched_domain.cpu7.domain1.imbalance_pct = 125
kernel.sched_domain.cpu7.domain1.max_interval = 4
kernel.sched_domain.cpu7.domain1.min_interval = 1
kernel.sched_domain.cpu7.domain1.name = MC
kernel.sched_domain.cpu7.domain1.newidle_idx = 0
kernel.sched_domain.cpu7.domain1.wake_idx = 0
kernel.sched_domain.cpu8.domain0.busy_factor = 64
kernel.sched_domain.cpu8.domain0.busy_idx = 0
kernel.sched_domain.cpu8.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu8.domain0.flags = 687
kernel.sched_domain.cpu8.domain0.forkexec_idx = 0
kernel.sched_domain.cpu8.domain0.idle_idx = 0
kernel.sched_domain.cpu8.domain0.imbalance_pct = 110
kernel.sched_domain.cpu8.domain0.max_interval = 2
kernel.sched_domain.cpu8.domain0.min_interval = 1
kernel.sched_domain.cpu8.domain0.name = SIBLING
kernel.sched_domain.cpu8.domain0.newidle_idx = 0
kernel.sched_domain.cpu8.domain0.wake_idx = 0
kernel.sched_domain.cpu8.domain1.busy_factor = 64
kernel.sched_domain.cpu8.domain1.busy_idx = 2
sysctl: kernel.sched_domain.cpu8.domain1.cache_nice_tries = 1
permission denied on key ‘kernel.usermodehelper.bset‘kernel.sched_domain.cpu8.domain1.flags = 559
kernel.sched_domain.cpu8.domain1.forkexec_idx = 0
kernel.sched_domain.cpu8.domain1.idle_idx = 0
sysctl: kernel.sched_domain.cpu8.domain1.imbalance_pct = 125
permission denied on key ‘kernel.usermodehelper.inheritable‘kernel.sched_domain.cpu8.domain1.max_interval = 4
kernel.sched_domain.cpu8.domain1.min_interval = 1
kernel.sched_domain.cpu8.domain1.name = MC
kernel.sched_domain.cpu8.domain1.newidle_idx = 0
kernel.sched_domain.cpu8.domain1.wake_idx = 0
kernel.sched_domain.cpu9.domain0.busy_factor = 64
kernel.sched_domain.cpu9.domain0.busy_idx = 0
kernel.sched_domain.cpu9.domain0.cache_nice_tries = 0
kernel.sched_domain.cpu9.domain0.flags = 687
kernel.sched_domain.cpu9.domain0.forkexec_idx = 0
kernel.sched_domain.cpu9.domain0.idle_idx = 0
kernel.sched_domain.cpu9.domain0.imbalance_pct = 110
kernel.sched_domain.cpu9.domain0.max_interval = 2
kernel.sched_domain.cpu9.domain0.min_interval = 1
kernel.sched_domain.cpu9.domain0.name = SIBLING
kernel.sched_domain.cpu9.domain0.newidle_idx = 0
kernel.sched_domain.cpu9.domain0.wake_idx = 0
kernel.sched_domain.cpu9.domain1.busy_factor = 64
kernel.sched_domain.cpu9.domain1.busy_idx = 2
kernel.sched_domain.cpu9.domain1.cache_nice_tries = 1
kernel.sched_domain.cpu9.domain1.flags = 559
kernel.sched_domain.cpu9.domain1.forkexec_idx = 0
kernel.sched_domain.cpu9.domain1.idle_idx = 0
kernel.sched_domain.cpu9.domain1.imbalance_pct = 125
kernel.sched_domain.cpu9.domain1.max_interval = 4
kernel.sched_domain.cpu9.domain1.min_interval = 1
kernel.sched_domain.cpu9.domain1.name = MC
kernel.sched_domain.cpu9.domain1.newidle_idx = 0
kernel.sched_domain.cpu9.domain1.wake_idx = 0
net.core.flow_limit_cpu_bitmap = 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000
sysctl: permission denied on key ‘net.ipv4.tcp_fastopen_key‘
vm.percpu_pagelist_fraction = 0
[email protected]:~$
如果CPU是多核，如何查看各颗CPU的运行状态：
[[email protected] ~] top
last pid: 42028; load averages: 0.83, 1.66, 1.71 up 168+04:04:19 15:08:58
163 processes: 1 running, 160 sleeping, 2 stopped
CPU: 2.9% user, 0.0% nice, 1.2% system, 0.0% interrupt, 95.9% idle
Mem: 653M Active, 2302M Inact, 669M Wired, 27M Cache, 786M Buf, 291M Free
Swap: 4096M Total, 2673M Used, 1423M Free, 65% Inuse
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
768 mysql 42 20 0 781M 186M uwait 0 43.3H 0.00% mysqld
943 mongodb 10 20 0 650M 4880K uwait 0 457:16 0.00% mongod88098 root 17 52 0 2517M 40824K uwait 1 335:57 0.00% java
87136 root 17 20 0 2537M 40976K uwait 0 335:47 0.00% java
88884 root 17 52 0 2517M 40992K uwait 1 335:02 0.00% java
88733 root 17 52 0 2529M 40672K uwait 1 333:07 0.00% java
从上面的结果，可以知道，这是一颗双核的 CPU（看 C 那列的值的个数）
[email protected]:~$
（ubuntu下支持不好！！！！？？？？）
[email protected]:~$ top
top - 14:10:43 up 5:12, 5 users, load average: 0.82, 1.52, 0.76
Tasks: 293 total, 1 running, 292 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.5 us, 0.1 sy, 0.0 ni, 97.8 id, 1.5 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 16373468 total, 15632456 used, 741012 free, 3917972 buffers
KiB Swap: 4687868 total, 16024 used, 4671844 free. 7148628 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
20438 rootroot 20 0 29284 1672 1056 R 12.6 0.0 0:00.02 top
1 root 20 0 33956 2796 1380 S 0.0 0.0 0:01.21 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H
7 root 20 0 0 0 0 S 0.0 0.0 0:06.37 rcu_sched
8 root 20 0 0 0 0 S 0.0 0.0 0:01.25 rcuos/0
9 root 20 0 0 0 0 S 0.0 0.0 0:01.25 rcuos/1
10 root 20 0 0 0 0 S 0.0 0.0 0:02.94 rcuos/2
11 root 20 0 0 0 0 S 0.0 0.0 0:06.37 rcuos/3
12 root 20 0 0 0 0 S 0.0 0.0 0:07.15 rcuos/4
13 root 20 0 0 0 0 S 0.0 0.0 0:01.76 rcuos/5
14 root 20 0 0 0 0 S 0.0 0.0 0:00.99 rcuos/6
15 root 20 0 0 0 0 S 0.0 0.0 0:00.87 rcuos/7
16 root 20 0 0 0 0 S 0.0 0.0 0:00.89 rcuos/8
17 root 20 0 0 0 0 S 0.0 0.0 0:00.85 rcuos/9
18 root 20 0 0 0 0 S 0.0 0.0 0:00.92 rcuos/10
19 root 20 0 0 0 0 S 0.0 0.0 0:00.74 rcuos/11
20 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh
21 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/0
22 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/1
23 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/2
24 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/3
25 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/4
26 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/5
27 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/6
28 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/7
29 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/8
30 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/9
31 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/10
32 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/11
33 root rt 0 0 0 0 S 0.0 0.0 0:00.15 migration/0
34 root rt 0 0 0 0 S 0.0 0.0 0:00.07 watchdog/0
35 root rt 0 0 0 0 S 0.0 0.0 0:00.06 watchdog/1
36 root rt 0 0 0 0 S 0.0 0.0 0:00.13 migration/1
37 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/1
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