View source for Vmstat

=System monitoring with vmstat=
The following results were obtained based on data collected using <tt>vmstat</tt>, a tool that reports a system's virtual memory statistics. 

These plots were produced using the scripts located on the [https://github.com/lsandoval/bb-perf 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.
[[File:Vmstat-procs-minimal.png|center|800px]]
== 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.
[[File:Vmstat-memory-minimal.png|center|800px]]
== IO Activity==
   IO
       bi: Blocks received from a block device (blocks/s).
       bo: Blocks sent to a block device (blocks/s).
[[File:Vmstat-io-minimal.png|center|800px]]
== System Operations==
   System
       in: The number of interrupts per second, including the clock.
       cs: The number of context switches per second.
[[File:Vmstat-system-minimal.png|center|800px]]
== 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.
[[File:Vmstat-cpu-minimal.png|center|1000px]]

=Reproducibility=
The overall behavior of each plot is the same when the monitoring script <tt>(vmstat.sh)</tt> is ran several times in the same machine; however, there are two cases where the plots mismatched with each other.

== IO Activity ==
The IO Activity plots are rather similar, but the Reading activity has different ranges as it is shown below.
<gallery class="center" widths = "500" heights = "400">
Image:Vmstat-io-minimal.png|Results obtained running the script for the first time
Image:Vmstat-io-minimal-2.png|Results obtained running the script for the second time
</gallery>

== CPU Resources ==
Although the behavior is quite similar between the plots, the CPU waiting time curve has different ranges as it is shown below.
<gallery class="center" widths = "900" heights = "400">
Image:Vmstat-cpu-minimal.png|Results obtained running the script for the first time
Image:Vmstat-cpu.png|Results obtained running the script for the second time
</gallery>