linux系统下cpu信息的查看

processor                 //系统中逻辑处理核的编号。对于多核处理器则可以是物理核、或者使用超线程技术虚拟的逻辑核
vendor_id                 //CPU制造商
cpu family                //CPU产品系列代号
model                     //CPU属于其系列中的哪一代的代号
model name                //CPU属于的名字及其编号、标称主频
stepping                  //CPU属于制作更新版本
cpu MHz                   //CPU的实际使用主频
cache size                //CPU二级缓存大小
physical id               //单个CPU的标号
siblings                  //单个CPU逻辑物理核数
core id                   //当前物理核在其所处CPU中的编号，这个编号不一定连续
cpu cores                 //该逻辑核所处CPU的物理核数
apicid                    //用来区分不同逻辑核的编号，系统中每个逻辑核的此编号必然不同，此编号不一定连续
fpu                       //是否具有浮点运算单元（Floating Point Unit）
fpu_exception             //是否支持浮点计算异常
cpuid level               //执行cpuid指令前，eax寄存器中的值，根据不同的值cpuid指令会返回不同的内容
wp                        //表明当前CPU是否在内核态支持对用户空间的写保护（Write Protection）
flags                     //当前CPU支持的功能
bogomips                  //在系统内核启动时粗略测算的CPU速度（Million Instructions Per Second）
clflush size              //每次刷新缓存的大小单位
cache_alignment           //缓存地址对齐单位
address sizes             //可访问地址空间位数
power management          //对能源管理的支持，有以下几个可选支持功能：

fpu: Onboard （x87） Floating Point Unit
vme: Virtual Mode Extension
de: Debugging Extensions
pse: Page Size Extensions
tsc: Time Stamp Counter: support for RDTSC and WRTSC instructions
msr: Model-Specific Registers
pae: Physical Address Extensions: ability to access 64GB of memory; only 4GB can be accessed at a time though
mce: Machine Check Architecture
cx8: CMPXCHG8 instruction
apic: Onboard Advanced Programmable Interrupt Controller
sep: Sysenter/Sy***it Instructions; SYSENTER is used for jumps to kernel memory during system calls, and SY***IT is used for jumps: back to the user code
mtrr: Memory Type Range Registers
pge: Page Global Enable
mca: Machine Check Architecture
cmov: CMOV instruction
pat: Page Attribute Table
pse36: 36-bit Page Size Extensions: allows to map 4 MB pages into the first 64GB RAM, used with PSE.
pn: Processor Serial-Number; only available on Pentium 3
clflush: CLFLUSH instruction
dtes: Debug Trace Store
acpi: ACPI via MSR
mmx: MultiMedia Extension
fxsr: FXSAVE and FXSTOR instructions
sse: Streaming SIMD Extensions. Single instruction multiple data. Lets you do a bunch of the same operation on different pieces of input: in a single clock tick.
sse2: Streaming SIMD Extensions-2. More of the same.
selfsnoop: CPU self snoop
acc: Automatic Clock Control
IA64: IA-64 processor Itanium.
ht: HyperThreading. Introduces an imaginary second processor that doesn‘t do much but lets you run threads in the same process a  bit quicker.
nx: No Execute bit. Prevents arbitrary code running via buffer overflows.
pni: Prescott New Instructions aka. SSE3
vmx: Intel Vanderpool hardware virtualization technology
svm: AMD "Pacifica" hardware virtualization technology
lm: "Long Mode," which means the chip supports the AMD64 instruction set
tm: "Thermal Monitor" Thermal throttling with IDLE instructions. Usually hardware controlled in response to CPU temperature.
tm2: "Thermal Monitor 2″ Decrease speed by reducing multipler and vcore.
est: "Enhanced SpeedStep"

[root@5201351 ~]# cat /proc/cpuinfo |grep "physical id" |sort|uniq |wc -l   //物理cpu的个数
[root@5201351 ~]# cat /proc/cpuinfo | grep "cpu cores" |uniq                //cpu的物理核数
[root@5201351 ~]# cat /proc/cpuinfo | grep "processor" | wc -l              //cpu的逻辑核数，逻辑核数从编号0开始（使用top按1也可查看）