linux查看cpu信息

查看内存信息， cat /proc/meminfo, 同理查看cpu信息， cat /proc/cpuinfo, 有时会有这样疑问，比如4核究竟是2cpu*双核呢，还是1cpu*四核呢？有一个简单的方法: 有多少个processor，就有多少个core, 有多少个cpu, 就看最后一个processor的physical id+1

举个例：

processor       : 0vendor_id       : GenuineIntelcpu family      : 6model           : 23model name      : Pentium(R) Dual-Core  CPU      E5300  @ 2.60GHzstepping        : 10cpu MHz         : 2593.270cache size      : 2048 KBphysical id     : 0siblings        : 2core id         : 0cpu cores       : 2apicid          : 0initial apicid  : 0fpu             : yesfpu_exception   : yescpuid level     : 13wp              : yesflags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm dts tpr_shadow vnmi flexprioritybogomips        : 5186.54clflush size    : 64cache_alignment : 64address sizes   : 36 bits physical, 48 bits virtualpower management:processor       : 1vendor_id       : GenuineIntelcpu family      : 6model           : 23model name      : Pentium(R) Dual-Core  CPU      E5300  @ 2.60GHzstepping        : 10cpu MHz         : 2593.270cache size      : 2048 KBphysical id     : 0siblings        : 2core id         : 1cpu cores       : 2apicid          : 1initial apicid  : 1fpu             : yesfpu_exception   : yescpuid level     : 13wp              : yesflags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm dts tpr_shadow vnmi flexprioritybogomips        : 5186.54clflush size    : 64cache_alignment : 64address sizes   : 36 bits physical, 48 bits virtualpower management:

这里有两个processor代码块，所以总核数就是2 core, 最后一个processor的physical id为0，则cpu数为1，所以是1cpu*双核

又如：

processor       : 0vendor_id       : AuthenticAMDcpu family      : 16model           : 8model name      : AMD Opteron(tm) Processor 4171 HEstepping        : 1cpu MHz         : 2094.686cache size      : 512 KBphysical id     : 0siblings        : 4core id         : 0cpu cores       : 4apicid          : 0initial apicid  : 0fpu             : yesfpu_exception   : yescpuid level     : 5wp              : yesflags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good extd_apicid unfair_spinlock pni cx16 popcnt hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvwbogomips        : 4189.37TLB size        : 1024 4K pagesclflush size    : 64cache_alignment : 64address sizes   : 42 bits physical, 48 bits virtualpower management:processor       : 1vendor_id       : AuthenticAMDcpu family      : 16model           : 8model name      : AMD Opteron(tm) Processor 4171 HEstepping        : 1cpu MHz         : 2094.686cache size      : 512 KBphysical id     : 0siblings        : 4core id         : 1cpu cores       : 4apicid          : 1initial apicid  : 1fpu             : yesfpu_exception   : yescpuid level     : 5wp              : yesflags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good extd_apicid unfair_spinlock pni cx16 popcnt hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvwbogomips        : 4187.98TLB size        : 1024 4K pagesclflush size    : 64cache_alignment : 64address sizes   : 42 bits physical, 48 bits virtualpower management:processor       : 2vendor_id       : AuthenticAMDcpu family      : 16model           : 8model name      : AMD Opteron(tm) Processor 4171 HEstepping        : 1cpu MHz         : 2094.686cache size      : 512 KBphysical id     : 0siblings        : 4core id         : 2cpu cores       : 4apicid          : 2initial apicid  : 2fpu             : yesfpu_exception   : yescpuid level     : 5wp              : yesflags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good extd_apicid unfair_spinlock pni cx16 popcnt hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvwbogomips        : 4189.34TLB size        : 1024 4K pagesclflush size    : 64cache_alignment : 64address sizes   : 42 bits physical, 48 bits virtualpower management:processor       : 3vendor_id       : AuthenticAMDcpu family      : 16model           : 8model name      : AMD Opteron(tm) Processor 4171 HEstepping        : 1cpu MHz         : 2094.686cache size      : 512 KBphysical id     : 0siblings        : 4core id         : 3cpu cores       : 4apicid          : 3initial apicid  : 3fpu             : yesfpu_exception   : yescpuid level     : 5wp              : yesflags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good extd_apicid unfair_spinlock pni cx16 popcnt hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvwbogomips        : 4189.33TLB size        : 1024 4K pagesclflush size    : 64cache_alignment : 64address sizes   : 42 bits physical, 48 bits virtualpower management:processor       : 4vendor_id       : AuthenticAMDcpu family      : 16model           : 8model name      : AMD Opteron(tm) Processor 4171 HEstepping        : 1cpu MHz         : 2094.686cache size      : 512 KBphysical id     : 1siblings        : 4core id         : 0cpu cores       : 4apicid          : 4initial apicid  : 4fpu             : yesfpu_exception   : yescpuid level     : 5wp              : yesflags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good extd_apicid unfair_spinlock pni cx16 popcnt hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvwbogomips        : 4189.26TLB size        : 1024 4K pagesclflush size    : 64cache_alignment : 64address sizes   : 42 bits physical, 48 bits virtualpower management:processor       : 5vendor_id       : AuthenticAMDcpu family      : 16model           : 8model name      : AMD Opteron(tm) Processor 4171 HEstepping        : 1cpu MHz         : 2094.686cache size      : 512 KBphysical id     : 1siblings        : 4core id         : 1cpu cores       : 4apicid          : 5initial apicid  : 5fpu             : yesfpu_exception   : yescpuid level     : 5wp              : yesflags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good extd_apicid unfair_spinlock pni cx16 popcnt hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvwbogomips        : 4189.29TLB size        : 1024 4K pagesclflush size    : 64cache_alignment : 64address sizes   : 42 bits physical, 48 bits virtualpower management:processor       : 6vendor_id       : AuthenticAMDcpu family      : 16model           : 8model name      : AMD Opteron(tm) Processor 4171 HEstepping        : 1cpu MHz         : 2094.686cache size      : 512 KBphysical id     : 1siblings        : 4core id         : 2cpu cores       : 4apicid          : 6initial apicid  : 6fpu             : yesfpu_exception   : yescpuid level     : 5wp              : yesflags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good extd_apicid unfair_spinlock pni cx16 popcnt hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvwbogomips        : 4189.37TLB size        : 1024 4K pagesclflush size    : 64cache_alignment : 64address sizes   : 42 bits physical, 48 bits virtualpower management:processor       : 7vendor_id       : AuthenticAMDcpu family      : 16model           : 8model name      : AMD Opteron(tm) Processor 4171 HEstepping        : 1cpu MHz         : 2094.686cache size      : 512 KBphysical id     : 1siblings        : 4core id         : 3cpu cores       : 4apicid          : 7initial apicid  : 7fpu             : yesfpu_exception   : yescpuid level     : 5wp              : yesflags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good extd_apicid unfair_spinlock pni cx16 popcnt hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvwbogomips        : 4189.36TLB size        : 1024 4K pagesclflush size    : 64cache_alignment : 64address sizes   : 42 bits physical, 48 bits virtualpower management:

这里有八个processor代码块，所以总核数就是8 core, 最后一个processor的physical id为1，则cpu数为2，所以是2cpu*四核

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