Linux memory analysis

Some fancy command lines to get back information on memory usage

Get all running processes and its major page fault count

ps -eo min_flt,maj_flt,cmd,uid,gid

To run a single command and get the perfomance info, run it via the time binary like this:

/bin/time -v ls
        Command being timed: "ls"
        User time (seconds): 0.00
        System time (seconds): 0.02
        Percent of CPU this job got: 64%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 0.03s
        Average shared text size (kbytes): 0
        Average unshared data size (kbytes): 0
        Average stack size (kbytes): 0
        Average total size (kbytes): 0
        Maximum resident set size (kbytes): 2544
        Average resident set size (kbytes): 0
        Major (requiring I/O) page faults: 0
        Minor (reclaiming a frame) page faults: 171
        Voluntary context switches: 0
        Involuntary context switches: 48
        Swaps: 0
        File system inputs: 0
        File system outputs: 0
        Socket messages sent: 0
        Socket messages received: 0
        Signals delivered: 0
        Page size (bytes): 4096
        Exit status: 0

To get a statistical snapshot every second try the vmstat command:

/ # vmstat 1
vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0  24300   6780     12  34220    2   16     2     2 1389 3275  5 10 85  0  0
 0  0  24300   6668     12  34220    0    0     0     0 1357 3050  8  4 88  0  0
...