Linux系统--查看Cache

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1）查看/proc/cpuinfo下的信息

例如：

processor   : 0
vendor_id   : GenuineIntel
cpu family  : 6
model       : 44
model name  : Intel(R) Xeon(R) CPU           E5620  @ 2.40GHz
stepping    : 2
cpu MHz     : 2400.002
cache size  : 12288 KB
fpu     : yes
fpu_exception   : yes
cpuid level : 11
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 nonstop_tsc aperfmperf pni pclmulqdq est ssse3 cx16 sse4_1 sse4_2 popcnt aes hypervisor lahf_lm ida arat
bogomips    : 4800.00
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

可以查看到cache size，以前的cache size往往表示的是L2 Cache，这里的是L3 Cache

cache_alignment是64bits

2）查看更详尽的Cache信息

使用 more /var/log/dmesg | grep cache

显示：

[    3.349664] Dentry cache hash table entries: 4194304 (order: 13, 33554432 bytes)
[    3.358149] Inode-cache hash table entries: 2097152 (order: 12, 16777216 bytes)
[    3.522622] Mount-cache hash table entries: 256
[    3.522882] CPU: L1 I cache: 32K, L1 D cache: 32K
[    3.522887] CPU: L2 cache: 256K
[    3.522890] CPU: L3 cache: 12288K
[    3.625486] CPU: L1 I cache: 32K, L1 D cache: 32K
[    3.625491] CPU: L2 cache: 256K
[    3.625495] CPU: L3 cache: 12288K
[    3.625797] CPU: L1 I cache: 32K, L1 D cache: 32K
[    3.625802] CPU: L2 cache: 256K
[    3.625804] CPU: L3 cache: 12288K
[    3.626067] CPU: L1 I cache: 32K, L1 D cache: 32K
[    3.626071] CPU: L2 cache: 256K
[    3.626074] CPU: L3 cache: 12288K
[    3.626345] CPU: L1 I cache: 32K, L1 D cache: 32K
[    3.626349] CPU: L2 cache: 256K
[    3.626351] CPU: L3 cache: 12288K
[    3.626629] CPU: L1 I cache: 32K, L1 D cache: 32K
[    3.626634] CPU: L2 cache: 256K
[    3.626636] CPU: L3 cache: 12288K
[    3.626906] CPU: L1 I cache: 32K, L1 D cache: 32K
[    3.626910] CPU: L2 cache: 256K
[    3.626912] CPU: L3 cache: 12288K
[    3.627183] CPU: L1 I cache: 32K, L1 D cache: 32K
[    3.627187] CPU: L2 cache: 256K
[    3.627189] CPU: L3 cache: 12288K
[    3.915409] IP route cache hash table entries: 524288 (order: 10, 4194304 bytes)
[    3.958509] Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    4.835685] ehci_hcd 0000:00:1a.7: cache line size of 32 is not supported
[    4.844852] sd 1:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[    4.850424] ehci_hcd 0000:00:1d.7: cache line size of 32 is not supported

可以看到L1 I Cache和D Cache，还可以看到L2 Cache

3）直接去Intel官网查看CPU情况，可以顺便结合Wiki百科

以上Xeon E5620的信息可以查看

http://www.intel.com/zh_CN/products/server/processor/xeonE5/index.htm

http://en.wikipedia.org/wiki/Xeon#3600.2F5600-series_.22Gulftown.22

http://en.wikipedia.org/wiki/Gulftown_(microprocessor)

顺便可以练一下英语= =！

ps:

Intel Xeon E5620

4 cores/processor 2 processors

L2 4 * 256KB