Mtrc (Metric, for short)
A small library to accumulate metrics and extract basic statistics from them. Want a latency profile of your Rack app? Boom.
gem install mtrc
Middleware all up in this bitch:
class MyMetrics
def initialize(app)
@app = app
@m = Mtrc::SortedSamples.new
Thread.new do
sleep 100
puts "Min: \#{@m.min}\nMedian: \#{@m.median}\n95th %: \#{@m % 95}\n99th %: \#{@m % 99}\n99.9th %: \#{@m.at .999}\nMax: \#{@m.max}\n"
@m = Mtrc::SortedSamples.new
end
end
def call(env)
t1 = Time.now
r = @app.call env
dt = Time.now - t1
@m << dt
r
end
end
Which requests take the longest?
@m << Mtrc::Sample.new dt, env[:PATH_INFO]
(@m % 95).value # => "?bacon=strips&bacon=strips&bacon=strips"
It's MIT licensed, bro. Pull requests? Roll one up homie.