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require "spec_helper"
require "chef/mixin/shell_out"
require "benchmark" unless defined?(Benchmark)
describe "ohai" do
include Chef::Mixin::ShellOut
let(:ohai) { "bundle exec ohai" }
describe "testing ohai performance" do
# The purpose of this test is to generally find misconfigured DNS on
# CI testers. If this fails, it is probably because the forward+reverse
# DNS lookup that node[:hostname] needs is timing out and failing.
#
# If it is failing spuriously, it may mean DNS is failing spuriously, the
# best solution will be to make sure that `hostname -f`-like behavior hits
# /etc/hosts and not DNS.
#
# If it still fails supriously, it is possible that the server has high
# CPU load (e.g. due to background processes) which are contending with the
# running tests (disable the screensaver on servers, stop playing Fortnite
# while you're running tests, etc).
#
# If this just fails due to I/O being very slow and ruby being very slow to
# startup then that still indicates that the tester configuration needs
# fixing. The fact that this will fail on a windows box on a virt that doesn't
# use an SSD is because we have a higher bar for the tests to run successfully
# and that configuration is broken, so this test is red for a reason.
#
# This will probably fail on raspberry pi's or something like that as well. That
# is not a bug. We will never accept a raspberry pi as a CI tester for our
# software. Feel free to manually delete and thereby skip this file in your
# own testing harness, but that is not our concern, we are testing behavior
# that is critical to our infrastructure and must run in our tests.
#
# XXX: unfortunately this is so slow on our windows testers (~9 seconds on one
# tester) that we can't enable it for windows unless we get some better perf there.
#
it "the hostname plugin must return in under 4 seconds (see comments in code)" do
# unfortunately this doesn't look stable enough to enable
skip "we need to do more performance work on windows and s390x testers before this can be enabled"
delta = Benchmark.realtime do
shell_out!("#{ohai} hostname")
end
expect(delta).to be < 4
end
# The purpose of this is to give some indication of if shell_out is slow or
# if the hostname plugin itself is slow. If this test is also failing that we
# almost certainly have some kind of issue with DNS timeouts, etc. If this
# test succeeds and the other one fails, then it can be some kind of shelling-out
# issue or poor performance due to I/O on starting up ruby to run ohai, etc.
#
it "the hostname plugin must return in under 2 seconds when called from pure ruby" do
delta = Benchmark.realtime do
Ohai::System.new.all_plugins(["hostname"])
end
expect(delta).to be < 2
end
end
end
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