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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 <<EOF
Min: #{@m.min}
Median: #{@m.median}
95th %: #{@m % 95}
99th %: #{@m % 99}
99.9th %: #{@m.at .999}
Max: #{@m.max}
EOF
@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.
Rates
---
r = Mtrc::Rate.new
10.times do
r.tick 2
end
sleep 1
r.rate #=> 19.999...
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