查看linux机器cpu、内存环境信息

2C2G，4C4G，8C16G，16C32G

这里C指cpu物理核数，G指总内存大小

# 查看物理CPU个数

cat  /proc/cpuinfo| grep "physical id"| sort| uniq| wc -l

# 查看每个物理CPU中core的个数(即核数)

cat /proc/cpuinfo| grep "cpu cores"| uniq

# 查看逻辑CPU的个数

cat /proc/cpuinfo| grep "processor"| wc -l

# C=CPU总核数 = 物理CPU个数 X 每颗物理CPU的核数

# 总逻辑CPU数 = 物理CPU个数 X 每颗物理CPU的核数 X 超线程数

# 查看CPU信息（型号）

cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c

查看内存信息 

cat /proc/meminfo

出现
MemTotal:        3924384 kB
MemFree:         3245376 kB
Buffers:           46976 kB
Cached:           518592 kB
SwapCached:            0 kB
Active:           322948 kB
Inactive:         254560 kB
Active(anon):      11948 kB
Inactive(anon):      184 kB
Active(file):     311000 kB
Inactive(file):   254376 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       2097148 kB
SwapFree:        2097148 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:         11944 kB
Mapped:             7572 kB
Shmem:               196 kB
Slab:              55920 kB
SReclaimable:      34876 kB
SUnreclaim:        21044 kB
KernelStack:         920 kB
PageTables:         1320 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     4059340 kB
Committed_AS:     101108 kB
VmallocTotal:   34359738367 kB
VmallocUsed:       20268 kB
VmallocChunk:   34359715628 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:        6016 kB
DirectMap2M:     2091008 kB
DirectMap1G:     2097152 kB
c2b-perf-b-4-[appuser@c2b-perf-b-4 ~]$

然后第一个数据MemTotal:        3924384 kB/1024/1024，从KB换算成MB最后到GB，约等于4G。

2G，4G，16G，32G对比如下：

MemTotal
kB	MB	GB
1922200	954.4190665	2
3924384	3832.40625	4
16333736	15950.91406	16
32879524	32108.91016	32