Vmstat

This is a focused and fast library to get system information like:

• Memory (free, active, …)
• Network Interfaces (name, in bytes, out bytes, …)
• CPU (user, system, nice, idle)
• Load Average
• Disk (type, disk path, free bytes, total bytes, …)
• Boot Time
• Current Task (used bytes and usage time MAC OS X / Linux ONLY)

It currently supports:

• FreeBSD
• MacOS X
• Linux (>= 2.6)
• OpenBSD
• NetBSD
• Solaris/SmartOS

It might support (but not tested):

• Older versions of linux

Installation

Add this line to your application’s Gemfile:

gem 'vmstat'

And then execute:

$ bundle

Or install it yourself as:

$ gem install vmstat

Usage

Just require the library and make a snapshot or use the distinct methods to just capture parts of the statistics. For further information have a look at the rdoc.

require "vmstat"

Vmstat.snapshot # => #<Vmstat::Snapshot:0x007fe5f22df660
#	 @at=2012-10-09 21:48:57 +0200,
#	 @boot_time=2012-10-09 18:42:37 +0200,
#	 @cpus=
#	  [#<struct Vmstat::Cpu
#	    num=0,
#	    user=187167,
#	    system=144466,
#	    nice=0,
#	    idle=786622>,
#	   #<struct Vmstat::Cpu num=1, user=2819, system=1641, nice=0, idle=1113782>,
#	   #<struct Vmstat::Cpu num=2, user=158698, system=95186, nice=0, idle=864359>,
#	   #<struct Vmstat::Cpu num=3, user=2702, system=1505, nice=0, idle=1114035>,
#	   #<struct Vmstat::Cpu num=4, user=140231, system=78248, nice=0, idle=899764>,
#	   #<struct Vmstat::Cpu num=5, user=2468, system=1314, nice=0, idle=1114460>,
#	   #<struct Vmstat::Cpu num=6, user=120764, system=66284, nice=0, idle=931195>,
#	   #<struct Vmstat::Cpu num=7, user=2298, system=1207, nice=0, idle=1114737>],
#	 @disks=
#	  [#<struct Vmstat::Disk
#	    type=:hfs,
#	    origin="/dev/disk0s2",
#	    mount="/",
#	    block_size=4096,
#	    free_blocks=51470668,
#	    available_blocks=51406668,
#	    total_blocks=61069442>],
#	 @load_average=
#	  #<struct Vmstat::LoadAverage
#	   one_minute=1.74072265625,
#	   five_minutes=1.34326171875,
#	   fifteen_minutes=1.1845703125>,
#	 @memory=
#	  #<struct Vmstat::Memory
#	   pagesize=4096,
#	   wired=1037969,
#	   active=101977,
#	   inactive=484694,
#	   free=470582,
#	   pageins=102438,
#	   pageouts=0>,
#	 @network_interfaces=
#	  [#<struct Vmstat::NetworkInterface
#	    name=:lo0,
#	    in_bytes=6209398,
#	    in_errors=0,
#	    in_drops=0,
#	    out_bytes=6209398,
#	    out_errors=0,
#	    type=24>,
#	   #<struct Vmstat::NetworkInterface
#	    name=:gif0,
#	    in_bytes=0,
#	    in_errors=0,
#	    in_drops=0,
#	    out_bytes=0,
#	    out_errors=0,
#	    type=55>,
#	   #<struct Vmstat::NetworkInterface
#	    name=:stf0,
#	    in_bytes=0,
#	    in_errors=0,
#	    in_drops=0,
#	    out_bytes=0,
#	    out_errors=0,
#	    type=57>,
#	   #<struct Vmstat::NetworkInterface
#	    name=:en0,
#	    in_bytes=1321276010,
#	    in_errors=0,
#	    in_drops=0,
#	    out_bytes=410426678,
#	    out_errors=0,
#	    type=6>,
#	   #<struct Vmstat::NetworkInterface
#	    name=:p2p0,
#	    in_bytes=0,
#	    in_errors=0,
#	    in_drops=0,
#	    out_bytes=0,
#	    out_errors=0,
#	    type=6>],
#	 @task=
#	  #<struct Vmstat::Task
#	   suspend_count=0,
#	   virtual_size=2551554048,
#	   resident_size=19628032,
#	   user_time_ms=28,
#	   system_time_ms=83>>

Test

Development

docker-compose up

Single test build and run:

docker build -t ruby-vmstat .
docker run --rm -ti ruby-vmstat rake spec

Todo

• Swap information
• Support more platforms (hp ux, aix, …)
• Optimize performance for OpenBSD, NetBSD using uvmexp etc. directly
• Optimize performance for solaris, smartos using kstat etc. directly
• Server performance/system information (open file handles, cache sizes, number of inodes …)

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request