我试图在我的系统中获得不同缓存级别的大小.
我试过两种技巧.
a)使用来自/ sys / device的信息.这是输出.
$cat /sys/devices/system/cpu/cpu0/cache/index1/size 32K $cat /sys/devices/system/cpu/cpu0/cache/index2/size 256K $cat /sys/devices/system/cpu/cpu0/cache/index3/size 8192K
b)使用来自dmidecode的信息
$sudo dmidecode -t cache
Cache Information
Socket Designation: cpu Internal L1
Configuration: Enabled,Not Socketed,Level 1
Operational Mode: Write Through
Location: Internal
Installed Size: 256 KB
Maximum Size: 256 KB
< .... >
Cache Information
Socket Designation: cpu Internal L2
Configuration: Enabled,Level 2
Operational Mode: Write Through
Location: Internal
Installed Size: 1024 KB
Maximum Size: 1024 KB
< .... >
Cache Information
Socket Designation: cpu Internal L3
Configuration: Enabled,Level 3
Operational Mode: Write Back
Location: Internal
Installed Size: 8192 KB
Maximum Size: 8192 KB
< .... >
报告的L2和L3缓存大小不同.有关a)为什么会出现这种差异的任何想法？ b)哪种方法给出了正确的值？
其他相关信息：
$uname -a Linux 3.0.0-14-generic #23somerville3-Ubuntu SMP Mon Dec 12 09:20:18 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 58 model name : Intel(R) Core(TM) i7-3770 cpu @ 3.40GHz stepping : 9 cpu MHz : 2400.000 cache size : 8192 KB physical id : 0 siblings : 8 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 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 nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 x2apic popcnt aes xsave avx f16c rdrand lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms bogomips : 6784.23 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical,48 bits virtual power management: < ... >
