taskset简介
taskset
Usage: taskset [options] [mask | cpu-list] [pid|cmd [args...]]
Show or change the CPU affinity of a process.
Options:
-a, --all-tasks operate on all the tasks (threads) for a given pid
-p, --pid operate on existing given pid
-c, --cpu-list display and specify cpus in list format
-h, --help display this help
-V, --version output version information
The default behavior is to run a new command:
taskset 03 sshd -b 1024
You can retrieve the mask of an existing task:
taskset -p 700
Or set it:
taskset -p 03 700
List format uses a comma-separated list instead of a mask:
taskset -pc 0,3,7-11 700
Ranges in list format can take a stride argument:
e.g. 0-31:2 is equivalent to mask 0x55555555
For more details see taskset(1).
查看cpu的核数
cat /proc/cpuinfo
root@w0112-virtual-machine:/home/w0112# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 158
model name : Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz
stepping : 10
microcode : 0xde
cpu MHz : 2304.000
cache size : 8192 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 22
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon nopl xtopology tsc_reliable nonstop_tsc eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch fsgsbase tsc_adjust bmi1 avx2 smep bmi2 invpcid rdseed adx smap clflushopt xsaveopt xsavec arat
bugs :
bogomips : 4608.00
clflush size : 64
cache_alignment : 64
address sizes : 43 bits physical, 48 bits virtual
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 158
model name : Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz
stepping : 10
microcode : 0xde
cpu MHz : 2304.000
cache size : 8192 KB
physical id : 2
siblings : 1
core id : 0
cpu cores : 1
apicid : 2
initial apicid : 2
fpu : yes
fpu_exception : yes
cpuid level : 22
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon nopl xtopology tsc_reliable nonstop_tsc eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch fsgsbase tsc_adjust bmi1 avx2 smep bmi2 invpcid rdseed adx smap clflushopt xsaveopt xsavec arat
bugs :
bogomips : 4608.00
clflush size : 64
cache_alignment : 64
address sizes : 43 bits physical, 48 bits virtual
power management:processor指出是第几个cpu处理器
root@w0112-virtual-machine:/home/w0112# cat /proc/cpuinfo | grep processor
processor : 0
processor : 1
cpu cores指出每个处理器的核心数量
root@w0112-virtual-machine:/home/w0112# cat /proc/cpuinfo | grep "cpu cores"
cpu cores : 1
cpu cores : 1
由此可以看出我的虚拟机有两个处理器，每个处理器有一个核
虚拟机可以通过如下设置配置
taskset使用
#!/bin/sh
while [ 1 ]
do
date=`date`
echo "date:$date"
sleep 5
done默认不绑定cpu
运行脚本
./bb.sh &
查看脚本程序的进程ID
root@w0112-virtual-machine:/home/w0112# ps | grep bb.sh
3037 pts/13 00:00:00 bb.sh
查看默认bb.sh绑定到那个核
语法：taskset -p PID
taskset -p 3037
root@w0112-virtual-machine:/home/w0112# taskset -p 3037
pid 3037's current affinity mask: 3
3表示默认使用了cpu0 cpu1
使用CPU编号绑定核
启动绑定到指定CPU
语法：taskset -c cpu-list PID
指定绑定到cpu0
root@w0112-virtual-machine:/home/w0112# taskset -c 0 ./bb.sh&
2\] 3175
### 查看进程运行在那个核
root@w0112-virtual-machine:/home/w0112# taskset -p 3175
pid 3175's current affinity mask: 1
1表示cpu0
### 指定绑定到cpu0和cpu1
root@w0112-virtual-machine:/home/w0112# taskset -c 0,1 ./bb.sh \&
\[1\] 3307
### 查看绑定结果
root@w0112-virtual-machine:/home/w0112# taskset -p 3307
pid 3307's current affinity mask: 3
3表示cpu0和cpu1
## 启动后绑定
### 运行测试脚本
./bb.sh \&
root@w0112-virtual-machine:/home/w0112# ./bb.sh \&
\[1\] 3389
进程ID 3389
### 绑定到cpu0
语法： taskset -cp cpu PID
#### 绑定到CPU0
root@w0112-virtual-machine:/home/w0112# taskset -cp 0 3389
pid 3389's current affinity list: 0,1
pid 3389's new affinity list: 0
默认绑定到两个核，修改之后绑定到CPU0
#### 查看绑定结果
oot@w0112-virtual-machine:/home/w0112# taskset -p 3389
pid 3389's current affinity mask: 1
mask为1表示cpu0
## 绑定到cpu0和cpu1
绑定指令
root@w0112-virtual-machine:/home/w0112# taskset -cp 0,1 3389
pid 3389's current affinity list: 0
pid 3389's new affinity list: 0,1
affinity是从0开始 mask是从1开始
查看绑定结果
root@w0112-virtual-machine:/home/w0112# taskset -p 3389
pid 3389's current affinity mask: 3
mask 3表示cpu0和cpu1 对应二进制0011，即是cpu0和cpu1
## 使用mask形式绑定核
### 指令介绍
语法：taskset -p mask PID
按照二进制形式从最低为到最高位分别表示cpu的核的序号
0xffffffffffffffff :表示是64核
0x0000000000000001:表示是cpu的第1核
0x0000000000000007:表示是cpu的第1、2、3个核
### 绑定cpu的两个核
root@w0112-virtual-machine:/home/w0112# taskset -p 0x3 3389
pid 3389's current affinity mask: 3
pid 3389's new affinity mask: 3
## 查看绑定结果
root@w0112-virtual-machine:/home/w0112# taskset -p 3389
pid 3389's current affinity mask: 3
# 判断进程目前分配到cpu ID
ps -o pid,psr,comm -p \