Linux查看cpu缓存

1. 查看cpu缓存
   dmesg | grep cache

[root@VM-8-11-centos ~]# dmesg | grep cache 
[    0.334898] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
[    0.337183] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
[    0.339219] Mount-cache hash table entries: 4096 (order: 3, 32768 bytes)
[    0.340991] Mountpoint-cache hash table entries: 4096 (order: 3, 32768 bytes)
[    0.846861] PCI: pci_cache_line_size set to 64 bytes
[    1.228024] Dquot-cache hash table entries: 512 (order 0, 4096 bytes)

2.查看cpu各级缓存大小
ls /sys/devices/system/cpu/cpu0/cache/

[root@VM-8-11-centos ~]# ls /sys/devices/system/cpu/cpu0/cache/
index0  index1  index2  index3
[root@VM-8-11-centos ~]# cat    /sys/devices/system/cpu/cpu0/cache/index0/size 
32K
[root@VM-8-11-centos ~]# cat    /sys/devices/system/cpu/cpu0/cache/index1/size 
32K
[root@VM-8-11-centos ~]# cat    /sys/devices/system/cpu/cpu0/cache/index2/size 
4096K
[root@VM-8-11-centos ~]# cat    /sys/devices/system/cpu/cpu0/cache/index3/size 
36608K

3. lscpu

[root@VM-8-11-centos ~]# lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                1
On-line CPU(s) list:   0
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 85
Model name:            Intel(R) Xeon(R) Platinum 8255C CPU @ 2.50GHz
Stepping:              5
CPU MHz:               2494.140
BogoMIPS:              4988.28
Hypervisor vendor:     KVM
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              4096K
L3 cache:              36608K
NUMA node0 CPU(s):     0
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single fsgsbase bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 arat avx512_vnni

查看缓存行大小

cat /sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size

[root@VM-8-11-centos ~]# cat    /sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size 
64