内存占用高

查看内存使用，以G为单位

$ free -g

查看内存使用，以M为单位

$ free -m

内存占用高的前20

$ ps aux | head -1;ps aux |grep -v PID |sort -rn -k +4 | head -20

查看进程的内存占用

$ pidstat -r -p 24427 1 5 

查看内存配置情况

$ cat /proc/meminfo
MemTotal:       65809312 kB
MemFree:         3020416 kB
MemAvailable:    6533688 kB
Buffers:            3784 kB
Cached:           558588 kB
SwapCached:            0 kB
Active:         57705220 kB
Inactive:         489732 kB
Active(anon):   57632596 kB
Inactive(anon):     4476 kB
Active(file):      72624 kB
Inactive(file):   485256 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:               860 kB
Writeback:             0 kB
AnonPages:      57632656 kB
Mapped:           493252 kB
Shmem:              4476 kB
Slab:            3719904 kB
SReclaimable:    3487336 kB
SUnreclaim:       232568 kB
KernelStack:       80560 kB
PageTables:       150496 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    32904656 kB
Committed_AS:   97707172 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      119084 kB
VmallocChunk:   34359489140 kB
HardwareCorrupted:     0 kB
AnonHugePages:  44861440 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      190332 kB
DirectMap2M:    10295296 kB
DirectMap1G:    58720256 kB