linux 查看cpu 多核与多U

# uname -a
Linux localhost.localdomain 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:39 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
(查看当前操作系统内核信息)
# cat /etc/issue | grep Linux
Red Hat Enterprise Linux AS release 4 (Nahant Update 5)
(查看当前操作系统发行版信息)
# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c
      8  Intel(R) Xeon(R) CPU            E5410   @ 2.33GHz
(看到有8个逻辑CPU, 也知道了CPU型号)
# cat /proc/cpuinfo | grep physical | uniq -c
      4 physical id      : 0
      4 physical id      : 1
(说明实际上是两颗4核的CPU)
# getconf LONG_BIT
32
(说明当前CPU运行在32bit模式下, 但不代表CPU不支持64bit)
# cat /proc/cpuinfo | grep flags | grep ' lm ' | wc -l
8
(结果大于0, 说明支持64bit计算. lm指long mode, 支持lm则是64bit)
.最后再完整看cpu物理信息, 不过大部分我们都不关心而已.
# dmidecode | grep -A48 'Processor Information$'
        Processor Information
                Socket Designation: CPU 1
                Type: Central Processor
                Family: Xeon
                Manufacturer: Intel           
                ID: 7A 06 01 00 FF FB EB BF
                Signature: Type 0, Family 6, Model 17, Stepping A
                Flags:
                        FPU (Floating-point unit on-chip)
                        VME (Virtual mode extension)
                        DE (Debugging extension)
                        PSE (Page size extension)
                        TSC (Time stamp counter)
                        MSR (Model specific registers)
                        PAE (Physical address extension)
                        MCE (Machine check exception)
                        CX8 (CMPXCHG8 instruction supported)
                        APIC (On-chip APIC hardware supported)
                        SEP (Fast system call)
                        MTRR (Memory type range registers)
                        PGE (Page global enable)
                        MCA (Machine check architecture)
                        CMOV (Conditional move instruction supported)
                        PAT (Page attribute table)
                        PSE-36 (36-bit page size extension)
                        CLFSH (CLFLUSH instruction supported)
                        DS (Debug store)
                        ACPI (ACPI supported)
                        MMX (MMX technology supported)
                        FXSR (Fast floating-point save and restore)
                        SSE (Streaming SIMD extensions)
                        SSE2 (Streaming SIMD extensions 2)
                        SS (Self-snoop)
                        HTT (Hyper-threading technology)
                        TM (Thermal monitor supported)
                        SBF (Signal break on FERR)
                Version: Intel(R) Xeon(R) CPU           E5410 @ 2.33GHz    
                Voltage: 1.2 V
                External Clock: 333 MHz
                Max Speed: 2333 MHz
                Current Speed: 2333 MHz
                Status: Populated, Enabled
                Upgrade: <OUT OF SPEC>
                L1 Cache Handle: 0x0005
                L2 Cache Handle: 0x0006
                L3 Cache Handle: 0x0007
                Serial Number: To Be Filled By O.E.M.
                Asset Tag: To Be Filled By O.E.M.
                Part Number: To Be Filled By O.E.M.
--
        Processor Information
                Socket Designation: CPU 2
                Type: Central Processor
                Family: Xeon
                Manufacturer: Intel           
                ID: 7A 06 01 00 FF FB EB BF
                Signature: Type 0, Family 6, Model 17, Stepping A
                Flags:
                        FPU (Floating-point unit on-chip)
                        VME (Virtual mode extension)
                        DE (Debugging extension)
                        PSE (Page size extension)
                        TSC (Time stamp counter)
                        MSR (Model specific registers)
                        PAE (Physical address extension)
                        MCE (Machine check exception)
                        CX8 (CMPXCHG8 instruction supported)
                        APIC (On-chip APIC hardware supported)
                        SEP (Fast system call)
                        MTRR (Memory type range registers)
                        PGE (Page global enable)
                        MCA (Machine check architecture)
                        CMOV (Conditional move instruction supported)
                        PAT (Page attribute table)
                        PSE-36 (36-bit page size extension)
                        CLFSH (CLFLUSH instruction supported)
                        DS (Debug store)
                        ACPI (ACPI supported)
                        MMX (MMX technology supported)
                        FXSR (Fast floating-point save and restore)
                        SSE (Streaming SIMD extensions)
                        SSE2 (Streaming SIMD extensions 2)
                        SS (Self-snoop)
                        HTT (Hyper-threading technology)
                        TM (Thermal monitor supported)
                        SBF (Signal break on FERR)
                Version: Intel(R) Xeon(R) CPU           E5410 @ 2.33GHz    
                Voltage: 1.2 V
                External Clock: 333 MHz
                Max Speed: 2333 MHz
                Current Speed: 2333 MHz
                Status: Populated, Enabled
                Upgrade: <OUT OF SPEC>
                L1 Cache Handle: 0x0009
                L2 Cache Handle: 0x000A
                L3 Cache Handle: 0x000B
                Serial Number: To Be Filled By O.E.M.
                Asset Tag: To Be Filled By O.E.M.
                Part Number: To Be Filled By O.E.M.

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