There are 2 files available on a Linux system which will give a user a wealth of information about a system. These files, /proc/cpuinfo and /proc/meminfo are written by the Linux kernel and tell you important details about your cpu and memory.
Both files are read-only and can be viewed with any text editor. This information may be overkill for most users but there are a variety of important fields to look for.
The cpuinfo file provides important stats including model name, cpu cores, cpu MHz, cache size, and flags which show what instruction sets are available on the processor. Systems with multiple processors or multiple cores will have separate entries for each.
Here for example is the output of my /proc/cpuinfo file:
$ cat /proc/cpuinfo
processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU T8300 @ 2.40GHz stepping : 6 cpu MHz : 800.000 cache size : 3072 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 10 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 lm constant_tsc arch_perfmon pebs bts rep_good nopl pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 lahf_lm ida bogomips : 4787.93 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU T8300 @ 2.40GHz stepping : 6 cpu MHz : 800.000 cache size : 3072 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 10 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 lm constant_tsc arch_perfmon pebs bts rep_good nopl pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 lahf_lm ida bogomips : 4787.96 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management:
The important fields to look for in the meminfo file include MemTotal, MemFree, and SwapTotal.
The output of the /proc/meminfo file :
$ cat /proc/meminfo
MemTotal: 4054116 kB MemFree: 3187648 kB Buffers: 19852 kB Cached: 288692 kB SwapCached: 0 kB Active: 527556 kB Inactive: 196060 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 208 kB Writeback: 0 kB AnonPages: 415096 kB Mapped: 103684 kB Slab: 50592 kB SReclaimable: 23924 kB SUnreclaim: 26668 kB PageTables: 15756 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 2027056 kB Committed_AS: 870676 kB VmallocTotal: 34359738367 kB VmallocUsed: 115908 kB VmallocChunk: 34359621627 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 86472 kB DirectMap2M: 4106240 kB
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