Vmstat: Difference between revisions

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


In order to reproduce the output shown in section 2, one should:
These plots were produced using the scripts located on the [https://github.com/lsandoval/bb-perf bb-perf] repository.
 
* Fetch upstream code from the <tt>core-image-minimal</tt> recipes
 
$ git clone git://git.yoctoproject.org/poky
$ cd poky/
$ source oe-init-build-env
$ echo -e 'DL_DIR = "/home/user/poky/downloads"' > conf/auto.conf
$ bitbake core-image-minimal -c fetchall
 
* Start vmstat in a new terminal (set a 2 sec interval)
$ vmstat 2 > vmstat-output.raw
 
* On the terminal from the first step, launch bitbake, making sure no network activity will be done
$ echo -e 'BB_NO_NETWORK = "1"' >> conf/auto.conf
$ bitbake core-image-minimal
 
* Once <tt>bitbake</tt> finishes, <tt>Ctrl+D</tt> the <tt>vmstat</tt> command to stop it


=System Characteristics=
=System Characteristics=

Revision as of 21:49, 8 March 2017

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.
Vmstat-procs-minimal.png

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.
Vmstat-memory-minimal.png

IO Activity

  IO
      bi: Blocks received from a block device (blocks/s).
      bo: Blocks sent to a block device (blocks/s).
Vmstat-io-minimal.png

System Operations

  System
      in: The number of interrupts per second, including the clock.
      cs: The number of context switches per second.
Vmstat-system-minimal.png

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.
Vmstat-cpu-minimal.png


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