Instrumenting Rails with Prometheus
To do so we can introduce a “type collector”: # lib/global_type_collector.rb unless defined? Rails require File.expand_path("../../config/environment", __FILE__) end require 'raindrops' class GlobalPrometheusCollector < PrometheusExporter::Server::TypeCollector include PrometheusExporter::Metric def initialize @web_queued = Gauge.new("web_queued", "Number of queued web requests") @web_active = Gau
Debugging 100% CPU usage in production Ruby on Rails systems
Sam Saffron Programming, Technology and the Art of Hacking Today I noticed one of our customer containers was running really high on CPU. # top -bn1 190 discour+ 20 0 2266292 205128 15656 S 86.7 0.3 9377:35 ruby # ps aux discour+ 190 19.4 0.3 2266292 207096 ? Sl 2017 9364:38 sidekiq 5.0.5 discourse [1 of 5 busy] Looks like sidekiq is stuck on a job. Where is it stuck? Usually, this is where the st
Speeding up Rails 4.2
Sam Saffron Programming, Technology and the Art of Hacking Recently Godfrey Chan got Discourse working on Rails Master. It was a rather long task that involved some changes to Discourse internals and some changes to Rails internals. Knowing Rails 4.2 was just around the corner I decided that it seemed like the perfect time to see how performance is. Seeing Rails 4.2 contains the adequate record pa
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