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| | #!/usr/bin/env ruby
# -*- encoding: binary -*-
# Copyright (C) 2012-2013, Eric Wong <normalperson@yhbt.net>
# License: GPLv3 or later (see COPYING for details)
usage = "Usage: #$0 PIDFILE (fast|slow)"
$stdout.binmode
$stdout.sync = $stderr.sync = true
$-w = true
require 'stringio'
output = <<EOF
Linux 6.6.6 (faster) 01/01/1970 _x86_64_ (666 CPU)
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.02 71.67 1.05 5.94 31.95 630.78 94.85 0.82 116.28 0.65 0.45
sdb 0.18 11.17 0.30 0.34 76.56 92.09 263.80 0.03 40.68 3.14 0.20
sdc 0.19 0.28 0.32 0.27 125.83 34.07 275.40 0.06 108.49 35.36 2.05
sdd 0.26 0.01 0.42 0.10 5.44 24.15 56.47 0.72 1373.24 1.88 0.10
sde 0.61 13.63 1.14 0.38 213.65 112.08 214.80 0.06 42.54 3.28 0.50
EOF
pidfile = ARGV.shift or abort usage
File.open(pidfile, "wb") { |fp| fp.write("#$$\n") }
n = 666666
begin
case ARGV.shift
when "fast"
n.times { $stdout.write(output * 2) }
when "slow"
n.times do
io = StringIO.new(output)
while buf = io.read(rand(25) + 1)
$stdout.write(buf)
sleep 0.01
end
sleep 0.1
end
when "bursty1"
n.times do
io = StringIO.new(output.dup)
add = io.gets
add << io.gets
$stdout.write(output + add)
sleep 2
while buf = io.read(rand(666) + 1)
$stdout.write(buf)
end
end
when "bursty2"
n.times do
io = StringIO.new(output.dup)
add = io.read(rand(66) + 6)
$stdout.write(output + add)
sleep 2
while buf = io.read(rand(666) + 1)
$stdout.write(buf)
sleep 0.01
end
sleep 1
end
else
abort usage
end
rescue Errno::EPIPE
exit 0
rescue => e
abort("#{e.message} (#{e.class})")
end
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