物理CPU，多核，超线程
判断依据：
1.具有相同core id的cpu是同一个core的超线程。
2.具有相同physical id的cpu是同一颗cpu封装的线程或者cores。
英文版：
1.Physical id and core id are not necessarily consecutive but they are unique. Any cpu with the same core id are hyperthreads in the same core.
2.Any cpu with the same physical id are threads or cores in the same physical socket.
1.
物理CPU，多核，超线程
1）物理CPU个数
$ cat /proc/cpuinfo | grep "physical id" | uniq
physical id : 0
=>CPU个数：1个
2）CPU核数
$ cat /proc/cpuinfo | grep "cpu cores" | uniq
cpu cores : 8
=》CPU核数：8个核
3）是否是超线程
$ cat /proc/cpuinfo | grep "core id"
core id : 0
core id : 1
core id : 2
core id : 3
core id : 4
core id : 5
core id : 6
core id : 7
=》core id都不一样，所以没有超线程
2。查看每个CPU的使用率
$top -d 1（数字1)
再按数字1，显示如下
Tasks: 194 total, 1 running, 193 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu2 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu3 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu4 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu5 : 0.0%us, 1.0%sy, 0.0%ni, 99.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu6 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu7 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 3095260k total, 1871716k used, 1223544k free, 622332k buffers
Swap: 4191228k total, 0k used, 4191228k free, 904036k cached
3。查看进程是哪个CPU上运行
$top -d 1（数字1)
f,进入"top Current Fields"
j,选中 j: P = Last used cpu (SMP)
回车
多了一列P，COMMAND前面
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ P COMMAND
9978 public 20 0 2632 1196 876 R 1 0.0 0:02.64 5 top
4。查看当前内核是否支持SMP
$uname -a
Linux 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:04:26 UTC 2009 i686 GNU/Linux
有SMP
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