Server Monitoring using vmstat ~ Tutorial Opensource and Linux

iostat / vmstat / mpstat are some tools to monitor server performance.

* iostat reports CPU, disk I/O, and NFS statistics.

* vmstat reports virtual memory statistics.

* mpstat reports processors statictics.

# vmstat

procs -----------memory-----------------          ---swap-- ------io---- ---system-- -----cpu--
r b    swpd    free     buff        cache   si   so    bi    bo   in   cs us sy id wa st
1 0 196112 75232 151884 611352   0    0     8     91   45   40 20 9 71 0 0

vmstat output contains the following fields:

    Procs – r: Total number of processes waiting to run
    Procs – b: Total number of busy processes
    Memory – swpd: Used virtual memory
    Memory – free: Free virtual memory
    Memory – buff: Memory used as buffers
    Memory – cache: Memory used as cache.
    Swap – si: Memory swapped from disk (for every second)
    Swap – so: Memory swapped to disk (for every second)
    IO – bi: Blocks in. i.e blocks received from device (for every second)
    IO – bo: Blocks out. i.e blocks sent to the device (for every second)
    System – in: Interrupts per second
    System – cs: Context switches
    CPU – us, sy, id, wa, st: CPU user time, system time, idle time, wait time

Display active and inactive memory

# vmstat -a

procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free inact active si so bi bo in cs us sy id wa st
1 0 196112 75236 224864 787620 0 0 8 91 45 41 20 9 71 0 0

Display number of forks since last boot

This displays all the fork system calls made by the system since the last boot.

# vmstat -f
500235 forks

Execute Every x seconds

# vmstat 2
# vmstat 2 5

Display slab info

# vmstat -m

Display statistics in a table format

# vmstat -s

Display disk statistics

# vmstat -d

Display statistics for a partition

# vmstat -p /dev/sda1

Display in MB

# vmstat -S m

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