Set job durations based on global quantiles

The p10 is a bit of a fudge, but the rest are broadly right.

application_worker.rb

@@ -10,6 +10,10 @@ module ApplicationWorker
 
   include Sidekiq::Worker # rubocop:disable Cop/IncludeSidekiqWorker
 
+  DECILES = [0.02, 0.028, 0.04, 0.054, 0.076, 0.115, 0.225, 0.389, 0.761]
+  P95 = 1.374
+  P99 = 3.647
+
   included do
     set_queue
   end
@@ -39,5 +43,9 @@ module ApplicationWorker
         .underscore
         .tr('/', '_')
     end
+
+    def job_duration
+      (([DECILES.first] * 14) + (DECILES[1..-1] * 10) + ([P95] * 5) + [P99]).sample
+    end
   end
 end

create_worker_classes.rb

@@ -29,9 +29,10 @@ ws.each do |w|
     classdef = <<-CLASSDEF
 class #{class_name}Worker
   include Sidekiq::Worker
+  include ApplicationWorker
 
   def perform(*args)
-    sleep = Random.rand * 5
+    sleep = self.class.job_duration 
     puts \"#{class_name} sleeping for \#{sleep}\"
     sleep(sleep)
   end