1. 通过 cat /proc/cpuinfo查看
类型一:包含了physical id、siblings、cpu id、cpu cores信息,processor表示逻辑处理器的个数,physical 表示物理处理器的个数
#cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU L5410 @ 2.33GHz
stepping : 10
cpu MHz : 2003.000
cache size : 6144 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu de tsc msr pae mce cx8 apic sep mtrr mca cmov pat clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good aperfmperf pni est ssse3 cx16 sse4_1 hypervisor lahf_lm
bogomips : 4657.10
clflush size : 64
cache_alignment : 64
address sizes : 38 bits physical, 48 bits virtual
power management:
类型二: 没有包含phpsical id、siblings、cpu id、cpu cores信息,此时processor就表示物理cpu的个数
#cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 44
model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz
stepping : 2
cpu MHz : 2394.094
cache size : 12288 KB
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu de tsc msr pae cx8 apic sep cmov pat clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good aperfmperf pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 popcnt aes hypervisor lahf_lm ida arat
bogomips : 4790.55
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
各选项的含义:
processor :系统中逻辑处理器的编号。对於单核处理器,则认为是其CPU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、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的物理核总数
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:
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、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的物理核总数
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:
ts: temperature sensor
fid: frequency id control
vid: voltage id control
ttp: thermal trip
tm:
stc:
100mhzsteps:
hwpstate:
CPU信息中flags各项含义:
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/Sysexit Instructions; SYSENTER is used for jumps to kernel memory during system calls, and SYSEXIT 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”
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/Sysexit Instructions; SYSENTER is used for jumps to kernel memory during system calls, and SYSEXIT 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”
查看逻辑CPU个数:
# cat /proc/cpuinfo | grep 'processor' | wc -l
# cat /proc/cpuinfo | grep 'processor' | wc -l
查看物理CPU个数:
# cat /proc/cpuinfo | grep 'physical id' | sort | uniq | wc -l
# cat /proc/cpuinfo | grep 'physical id' | sort | uniq | wc -l
查看每个物理CPU中Core的个数:
# cat /proc/cpuinfo | grep 'cpu cores' | wc –l
# cat /proc/cpuinfo | grep 'cpu cores' | wc –l
二、通过lscpu命令查看(suse系统,没这命令的跳过)
#lscpu
Architecture: x86_64
CPU(s): 8
Thread(s) per core: 1
Core(s) per socket: 1
CPU socket(s): 8
Vendor ID: GenuineIntel
CPU family: 6
Model: 23
Stepping: 10
CPU MHz: 2003.000
Hypervisor vendor: Xen
Virtualization type: none
L1d cache: 32K
L1i cache: 32K
L2 cache: 6144
三、通过top命令查看
#top
然后按数字1,既可以查看cpu的个数,还可以知道每个cpu的具体使用情况
Tasks: 76 total, 1 running, 75 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 0.3%sy, 0.0%ni, 94.4%id, 5.3%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
Mem: 4207280k total, 724144k used, 3483136k free, 211508k buffers
Swap: 8385888k total, 0k used, 8385888k free, 330340k cached