Vmstat

System monitoring with vmstat

The following results were obtained based on data collected using vmstat, a tool that reports a system's virtual memory statistics.

These plots were produced using the scripts located on the bb-perf repository.

System Characteristics

Distro

CentOS Linux release 7.3.1611 (Core)
Linux version 3.10.0-514.6.1.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC) ) #1 SMP Wed Jan 18 13:06:36 UTC 2017

RAM

MemTotal:       131814472 kB
MemFree:        70067576 kB
MemAvailable:   127241460 kB

Processor

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                48
On-line CPU(s) list:   0-47
Thread(s) per core:    2
Core(s) per socket:    12
Socket(s):             2
NUMA node(s):          2
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 62
Model name:            Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz
Stepping:              4
CPU MHz:               1263.621

Vmstat Output

Processing Jobs

  Procs
      r: The number of runnable processes (running or waiting for run time).
      b: The number of processes in uninterruptible sleep.

Memory Usage

  Memory
      swpd: the amount of virtual memory used.
      free: the amount of idle memory.
      buff: the amount of memory used as buffers.
      cache: the amount of memory used as cache.

IO Activity

  IO
      bi: Blocks received from a block device (blocks/s).
      bo: Blocks sent to a block device (blocks/s).

System Operations

  System
      in: The number of interrupts per second, including the clock.
      cs: The number of context switches per second.

CPU Resources

  CPU
      These are percentages of total CPU time.
      us: Time spent running non-kernel code.  (user time, including nice time)
      sy: Time spent running kernel code.  (system time)
      id: Time spent idle.  Prior to Linux 2.5.41, this includes IO-wait time.
      wa: Time spent waiting for IO.  Prior to Linux 2.5.41, included in idle.
      st: Time stolen from a virtual machine.  Prior to Linux 2.6.11, unknown.