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如何查看CPU的cache大小

2012年7月18日 发表评论 阅读评论 1,112 次浏览

当然，最简单的办法是利用dmidecode命令：

[root@localhost ~]# dmidecode -t cache
# dmidecode 2.9
SMBIOS 2.6 present.

Handle 0x0005, DMI type 7, 19 bytes
Cache Information
        Socket Designation: L1-Cache
        Configuration: Enabled, Not Socketed, Level 1
        Operational Mode: Write Through
        Location: Internal
        Installed Size: 256 KB
        Maximum Size: 256 KB
        Supported SRAM Types:
                Other
        Installed SRAM Type: Other
        Speed: Unknown
        Error Correction Type: Parity
        System Type: Instruction
        Associativity: 4-way Set-associative

Handle 0x0006, DMI type 7, 19 bytes
Cache Information
        Socket Designation: L2-Cache
        Configuration: Enabled, Not Socketed, Level 2
        Operational Mode: Write Through
        Location: Internal
        Installed Size: 1024 KB
        Maximum Size: 1024 KB
        Supported SRAM Types:
                Other
        Installed SRAM Type: Other
        Speed: Unknown
        Error Correction Type: Single-bit ECC
        System Type: Unified
        Associativity: 8-way Set-associative

Handle 0x0007, DMI type 7, 19 bytes
Cache Information
        Socket Designation: L3-Cache
        Configuration: Enabled, Not Socketed, Level 3
        Operational Mode: Write Back
        Location: Internal
        Installed Size: 8192 KB
        Maximum Size: 8192 KB
        Supported SRAM Types:
                Other
        Installed SRAM Type: Other
        Speed: Unknown
        Error Correction Type: Single-bit ECC
        System Type: Unified
        Associativity: 16-way Set-associative

Handle 0x0009, DMI type 7, 19 bytes
Cache Information
        Socket Designation: L1-Cache
        Configuration: Enabled, Not Socketed, Level 1
        Operational Mode: Write Through
        Location: Internal
        Installed Size: 256 KB
        Maximum Size: 256 KB
        Supported SRAM Types:
                Other
        Installed SRAM Type: Other
        Speed: Unknown
        Error Correction Type: Parity
        System Type: Instruction
        Associativity: 4-way Set-associative

Handle 0x000A, DMI type 7, 19 bytes
Cache Information
        Socket Designation: L2-Cache
        Configuration: Enabled, Not Socketed, Level 2
        Operational Mode: Write Through
        Location: Internal
        Installed Size: 1024 KB
        Maximum Size: 1024 KB
        Supported SRAM Types:
                Other
        Installed SRAM Type: Other
        Speed: Unknown
        Error Correction Type: Single-bit ECC
        System Type: Unified
        Associativity: 8-way Set-associative

Handle 0x000B, DMI type 7, 19 bytes
Cache Information
        Socket Designation: L3-Cache
        Configuration: Enabled, Not Socketed, Level 3
        Operational Mode: Write Back
        Location: Internal
        Installed Size: 8192 KB
        Maximum Size: 8192 KB
        Supported SRAM Types:
                Other
        Installed SRAM Type: Other
        Speed: Unknown
        Error Correction Type: Single-bit ECC
        System Type: Unified
        Associativity: 16-way Set-associative

[root@localhost ~]#

再看一下CPU信息：


[root@localhost ~]# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 26
model name      : Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
stepping        : 5
cpu MHz         : 1600.000
cache size      : 8192 KB
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 4
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology tsc_reliable nonstop_tsc pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 lahf_lm tpr_shadow vnmi flexpriority ept vpid
bogomips        : 4533.09
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 26
model name      : Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
stepping        : 5
cpu MHz         : 1600.000
cache size      : 8192 KB
physical id     : 0
siblings        : 4
core id         : 1
cpu cores       : 4
apicid          : 2
initial apicid  : 2
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology tsc_reliable nonstop_tsc pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 lahf_lm tpr_shadow vnmi flexpriority ept vpid
bogomips        : 4532.07
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 2
vendor_id       : GenuineIntel
cpu family      : 6
model           : 26
model name      : Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
stepping        : 5
cpu MHz         : 1600.000
cache size      : 8192 KB
physical id     : 0
siblings        : 4
core id         : 2
cpu cores       : 4
apicid          : 4
initial apicid  : 4
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology tsc_reliable nonstop_tsc pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 lahf_lm tpr_shadow vnmi flexpriority ept vpid
bogomips        : 4532.09
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 3
vendor_id       : GenuineIntel
cpu family      : 6
model           : 26
model name      : Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
stepping        : 5
cpu MHz         : 1600.000
cache size      : 8192 KB
physical id     : 0
siblings        : 4
core id         : 3
cpu cores       : 4
apicid          : 6
initial apicid  : 6
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology tsc_reliable nonstop_tsc pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 lahf_lm tpr_shadow vnmi flexpriority ept vpid
bogomips        : 4532.09
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 4
vendor_id       : GenuineIntel
cpu family      : 6
model           : 26
model name      : Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
stepping        : 5
cpu MHz         : 1600.000
cache size      : 8192 KB
physical id     : 1
siblings        : 4
core id         : 0
cpu cores       : 4
apicid          : 16
initial apicid  : 16
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology tsc_reliable nonstop_tsc pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 lahf_lm tpr_shadow vnmi flexpriority ept vpid
bogomips        : 4532.15
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 5
vendor_id       : GenuineIntel
cpu family      : 6
model           : 26
model name      : Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
stepping        : 5
cpu MHz         : 1600.000
cache size      : 8192 KB
physical id     : 1
siblings        : 4
core id         : 1
cpu cores       : 4
apicid          : 18
initial apicid  : 18
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology tsc_reliable nonstop_tsc pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 lahf_lm tpr_shadow vnmi flexpriority ept vpid
bogomips        : 4532.15
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 6
vendor_id       : GenuineIntel
cpu family      : 6
model           : 26
model name      : Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
stepping        : 5
cpu MHz         : 1600.000
cache size      : 8192 KB
physical id     : 1
siblings        : 4
core id         : 2
cpu cores       : 4
apicid          : 20
initial apicid  : 20
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology tsc_reliable nonstop_tsc pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 lahf_lm tpr_shadow vnmi flexpriority ept vpid
bogomips        : 4532.15
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

processor       : 7
vendor_id       : GenuineIntel
cpu family      : 6
model           : 26
model name      : Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
stepping        : 5
cpu MHz         : 1600.000
cache size      : 8192 KB
physical id     : 1
siblings        : 4
core id         : 3
cpu cores       : 4
apicid          : 22
initial apicid  : 22
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology tsc_reliable nonstop_tsc pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 lahf_lm tpr_shadow vnmi flexpriority ept vpid
bogomips        : 4532.15
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

[root@localhost ~]#

从上面显示的数据，可以了解到两点：
第一，CPU信息：
Intel至强E5520 CPU，有两个物理CPU，每一个物理CPU有4逻辑核。
第二，一个物理CPU的CACHE信息：
L1 cache：256 KB
L2 cache：1024 KB
L3 cache：8192 KB

由于现代CPU的L1 cache是逻辑核私有的，而E5520 CPU有4逻辑核，所以每个核只有64 KB的L1 cache，而且L1 cache分指令L1 cache和数据L1 cache，平分下来只有32 KB；目前，L2 cache也是片内私有，所以每个核只有256 KB；而对于L3 cache，一个物理核CPU的所有逻辑核共享，所以在每个逻辑核来看，L3 cache都为8192 KB。

在CentOS系统上，直接来看系统导出的接口数据来验证上面的说法，如下：

[root@localhost ~]# cat /sys/devices/system/cpu/cpu0/cache/index0/type
Data
[root@localhost ~]# cat /sys/devices/system/cpu/cpu0/cache/index0/size
32K
[root@localhost ~]# cat /sys/devices/system/cpu/cpu0/cache/index1/type
Instruction
[root@localhost ~]# cat /sys/devices/system/cpu/cpu0/cache/index1/size
32K
[root@localhost ~]# cat /sys/devices/system/cpu/cpu0/cache/index2/type
Unified
[root@localhost ~]# cat /sys/devices/system/cpu/cpu0/cache/index2/size
256K
[root@localhost ~]# cat /sys/devices/system/cpu/cpu0/cache/index3/type
Unified
[root@localhost ~]# cat /sys/devices/system/cpu/cpu0/cache/index3/size
8192K

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